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.-- -- AVIONICS SYSTEMS ENGINEERING DIVISION '
(N!! SA-CR- 142 ' 5 8 ) RCS PROPULSf ON Pt)r ':TIONAT : 'Ti4 A N A L Y S I S FOR PEaFORLIlbNCE B O R , T O R I N C t XVLT C E T E C T I C N AND A 1 % " ; ~ 2 I A T I G L ( L o c k h s e d Electrocics Co.) ?24 p HC 39.25 CSCL 218
Unclas G3/28 50343
RCS PROFULSIOd FUNCTIONAL ? A m ANALYSIS
FOR PERFORMANCE WNITORING FAULT DETECTJOi
AND ANNUNCIATION
3ISTRIBUTION AND RErERENCING - ,-, -
'1
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LYNDON B. JOaNSON SPACE CENTER - 3" July 1974
LEC- 3594
https://ntrs.nasa.gov/search.jsp?R=19740026133 2020-03-05T17:33:13+00:00Z
- - AVIONICS SYSTEMS ENGINEERING 9IVISION -
2CS PROPULSION FUNCTIONAL PATH M L Y S I S
FOR PERFORMANCE MONITORIKG FAULT DETECTION
AND ANNUNCIATION
Lockheed ~ l e c t i o n i c s cbmpanyT Inc.
Chief, Communica ys teas Branch
Chief, Avionics Sys tems ~ n ~ i h e e r i n g Division
NATIOXAL AERONAUTICS AND SPACE ADMINISTRATION LYNDON B. JOHNSON SPACE CENTER
?%%STON, TEXAS
July 1974
LEC- 3594
This document was prepared by Lozkheed Electronics Company, Inc . , Aerospace Systems Divis i -a , Houston, Texas, f or the Avionics Systems Engineering Div i s i t . . a t the Johnson Space Center, under contract NAS 9-12200, Job Order 22-20 . I t was writtex by E. L. Keesler, Principal Engineer, and was approved by J . R. Thrasher, Manager, Avionics Systems Engineering and Evaluatioa Department, Lockheed Elec tmnics Company, Inc.
iii
CONTENTS
Section
1.0 S U W R Y . . . . . . . . . . . . . . . . . . 2 . 0 INTRODUCTION . . . . . . . . . . . . . . .
2 . 2 System Cescription . . . . . . . . . 2 . 2 . 1 Reaction Control System
(RCS) . . . . . . . . . . . . 2 . 2 . 2 RCS organization . . . . . . . 2 . 2 . 3 RCS components . . . . . . . . 2 . 2 . 4 KCS propellant supply . . . . 2 . 2 . 5 RCS activation . . . . . . . . 2 . 2 . 6 RCS reentry configuration . . 2 .2 .7 Failed thruster m~nitoring . .
. . . 2 . 2 . 8 RCS configuraticn status
3.0 FUNCTIONAL PATH ANALYSIS OF FORNARD RCS . . . . . 3.1 Functional Path Identification
. . . . . 3 . 2 Functionat Path Description
. . . . . 3 . 3 Operating Functional Paths
MEASUREMENT REQUIREMENTS FOR FAULT DETECTION MD ANNUNCIATION -- FORWARD R C S . . . . . . . . . . . . . . . . . . . . 4.1 FDA Measurements . . . . . . . . . . 4 . 2 Cescription of Parameters to be
Monitored . . . . . . . . . . . . . .
Page
P- 1
Page
4.2.1 Helium source pressures . . . . 4-1 I
Section
4.2.2 Propellant ~ressures . . . . . 4-1 4.2.3 Manifold pressures . . . . . . 4 - 5
. . . . . 4.2.4 Thruster temperatures 4-5
. . . . . . . . 4.3 Leak Detection Methods 4-5
4.3.1 Quanity remaining . . . . . . . 4-5 4.3.2 Delta pressure . . . . . . . . 4- 5
5.0 FUNCTIONAL PATH ANAYLSIS OF THE AFT RCS . . . . . . . . . . . . . . . . . . . . 5-1
. . . . 5.1 Functional Path Identification 5-1
5.2 Functional Path Description Aft Left RCS . . . . . . . . . . . . . . . 5-1
5.3 Functional Path Description Aft Right RCS . . . . . . . . . . . . . . 5-6
. . . . . . 5.4 Operating Functional Paths 5-6
5.4.1 Fuel operating functional paths -aft left RCS . . . . . 5-7
5.4.2 Oxidizer operating functional paths - aft left RCS . . . . . 5-8
5.4.3 Fuel operating functional . . . . . paths - aft right RCS 5-9
5.4.4 Oxidizer operating functional paths - aft right RCS . . . . . 5-11
6.0 MEASUREMEJT REQUIREMENTS FOR FAULT . . . . DETECTION AND ANNUNCIATION - AFT RCS 6-1
6.1 FDA Measurements . . . . . . . . . . 6-1
Section 6.2 Description of Parameters to be
Monitored . . . . . . . . . . . . . . Page
6.2.1 Helium source pressure . . . . . . . . . 6.2.2 Propellsnt pressures
. . . . . . 6.2.3 Manifold pressures
. . . . . 6.2.4 Thruster temperature
. . . . . . . 6.3 Leak Detection Methods
. . . . . . 6.3.i Quanity remaining
. . . . . . . . 6.3.2 Delta pressure
RCS CROSSFEED OPERATION . . . . . . . . . . 7.1 Configuration . . . . . . . . . . . . 7.2 Operational Guidelines . . . . . . . 7.3 Crossfeed Components . . . . . . . . 7.4 Propellant Operating Functional . . . . . . . Paths for RCS Crossfeed
7.4.1 k;S fuel tanks to crossfeed lin? . . . . . . . . . . . . .
7.4.2 RCS oxidizer tanks to . . . . . . . crossfeed lines
7.4.3 Crossfeed from aft right RCS tanks to aft left . . . . . . . . RCS manifolds
7.4.4 Crossfeed from aft left RCS tanks to aft right . . . . . . . . RCS manifolds
7.5 Measurements . . . . . . . . . . . .
Section 8 . 0 RCS, OMS INTERCONNECT OPERATION . . . . . .
Func~ional Paths for OMS/RCS Interconnect . . . . . . . . . . . . Functional Path Anal.ysis of OMS Propellant Path to Crossfeed Lines . . . . . . . . . . . . . . . . OMS Operating Functional Paths to the Crossfeed Lines . . . . . . . . . Operating Functional Paths for Interconnect Left OMS to Left RCS Manifolds . . . . . . . . . . . . . . Operating Functional Paths for Interconnect Right OMS to Left . . . . . . . . . . . . RCS Manifolds
Operating Functional Paths for Interconnect Left OMS to Right RCS Manifolds . . . . . . . . . . . . Operating Functional Paths for Interconnect Right OMS to Right RCS Manifold5 . . . . . . . . . . . .
. . . Crossfeed Singie Point Failure
Measurements . . . . . . . . . . . . RCS INTERCONNECT TO CARGO BAY AUXILIARY . . . . . . . . . . . . . . PROPELLANT KIT
9.1 Functional Path Analysis of Auxiliary Propellant to Crossfeed Lines . . . . . . . . . . .
9.2 Cargo Bay Kit Operating Functional Paths to the Crossfeed Lines . . . .
9.3 Cargo Bay Kit Operating Functional . . . Paths to P-ft Left RCS Manifold
vii
Page 8- 1
8- 1
8- 1
8- 3
8 - 4
8- 5
8- 6
8- 7
8- 8
8- 8
9- 1
9- 1
9- 4
9- 4
Page 9.4 Cargo Bay K i t Operating Functional
Paths to Aft Right RCS Manifold . . . 9-5
FLIGHT CONTROL SYSTEMjREACTION CONTROL SYSTEM INTERFACES . . . . . . . . . . . . .lo- 1
. . . . . . . . 10.1 Interface Operation .lo-1
10.2 Detectable Failures . . . . . . . . .lo-1 . . . . . . . 10.3 Undetectable Failures .lo-3
CONCLUSIONS AND RECOMMENDATIONS . . . . . .11-1 . . . . . . . . . . 11.1 System Definition .11-1
. . . . . . . . . . . . 11.2 Forward RCS -11- 1
. . . . . . . 11.3 Left and Right A f t Rcs .11-i
11.4 RCS Cross feed/ Interconnect . . . . . . . . . . . . . . Operation 11-2
. . . . . . . . . 11.5 FCS/RCS Interface .11-3
viii
\ . I
FIGURES
Figure
1
Page
Forward RCS propellant supply functional . . . . . . . . . . . . . . . . . . paths.. 3-2
Functional paths forward RCS A and C manifold thrusters . . . . . . . . . . . . . 3-3 Functional paths forward RCS E, B, and D manifolds. . . . . . . . . . . . . . . . . . 3-4 Forward RCS propellant supply . . . . . . . . . . . . . . . instrumentation 4-2
Forward manifolds B, D, and E instrunentation . . . . . . . . . . . . . . . 4-3 Forward manifolds A and C instrumentation . . . . . . . . . . . . . . . 4-4
. . . . . . . . Left aft RCS functional paths 5-2
. . . Left aft RCS manifold functional paths 5-3
Right aft KCS functional paths . . . . . . . 5-4 Right aft RCS manifold functional paths . . . 5-5
. . . . . . Left aft RCS measurements for FDA 6-2
Left aft RCS manifold measurements for FDA . 6-3
. . . . . 13 Right aft RCS measurenents for FDA 6-4
14 Right aft RCS manifolds measurements for . . . . . . . . . . . . . . . . . . . F D A . . 6-5
. . . . . . . . . . . . . . . 15 Fuel crossfeed 7-2
16 Oxidizer crossfeed . . . . . . . . . . . . . 7-3 17 Functional paths for OMSIRCS interconnect . . 8-2
. . . . . . . 18 Cargo bay kit functional paths 9-2
. . . . . . . . . . . 19 Basic FCS/RCS interface 10-2
Table 1
, r
TABLES
Page MEASUREMENTS REQUIRED FOR FORWARD RCS FAULT DETECTION AND ANNUNCIATION . . . 4-6
RIGHT AFT RCS MEASUREMEPTS FOR FDA . . . . 6-8
LEFT AFT RCS MEASUREMENTS FOR FDA . . . . . 6-20
LEFT OMS MEASUREMENTS FOR FDA DURING LEFT OMS/RCS INTERCONNECT . . . . . . . 8-9
RIGHT OMS MEASUREMENTS FOR FDA DURING RIGHT OMS/RCS INTERCONNECT . . . . . . 8-14
AUXILIARY PROPELLANT KJT MEASUREMENTS REQUIREDFG3RCSFDA.. . . . . 9-7
Aux
Eng
FCS
Fu
Fwd
He
Inj r
Is In
I.,
Manf
OMS
Ox or Oxid
Po s
Prplt
R
RCS
Rlf
Rgltr
SOY
Temp
Tk
XFD
. . '
ABBREVIATIONS
Auxiliary
Engine
Flight Control Svstem
Fue 1
Forward
Helium
Injector
Isolation
Left
Manifold
Orbital Maneuvering System
Oxidizer
Position
Propellant
Right I
Reaction Control System
Relief
Regulator
Shut-off valve
Temperature
Tank
Crossfeed
1.0 SUMMARY
The Reaction Control System (RCS) is not completely defined at this time. The configuration considered i~, this document is shown in the illustrations included in
this document.
Future configuration changes should have little impact
on the measurements required for fault detection and
annunciation.
One hundred and eleven measurements have been identified
for use in fault detection and annunciation, that are not included in the blaster Measurements List, dated November 16,
1373.
These measu-ements are divided into the following
categories :
a Burn through monitors
a Engine tempera-tures
Manifold pressures
e Shut-off valve positions
a Redundant helium source pressures
a Cargo bay taak pressures
Cowideration should bc! given to including the following in the design of the reaction jet drivers:
Redundant chamber pressure sensors.
e Jet driver output monitors.
Jet driver electrical-ON failure isolation capab i 1 i ty . Single jet driver power isolation cr.pability.
Failure identification annunciation.
and lto r
2.1 Purpose Z
This docwent defines the functional paths of the RCS :
defines the operational flight instrumentation required .: . performance monitoring fault detection and annullriation.
A functional path, as used in this document, is defined
as m e or more functional elements which may be combined
into operating functional paths which are controllable or
selectable by the flight crew for systems management.
2.2 System Description
2.2.1 Reaction Control S).stem (RCS) . The RCS, oper-
ating in conjunction ~ i t h the Guidance h'avigation and Control
Subsystem, employs 38 bipropellant primary and six vernier
thrusters to provide precise attitude coctrol arid three-
a x i s translation durinp sepc.: at i .in from the external tank.,
orbit insertion, orbital and reclti-y phases of flight.
In addition, the RCS pravides roll control dbring single
engine orbital maneuvering system burns.
2.2.2 RCS organization. The RCS consists of three
independent propulsion packages. One modvle, comprising 14
primary thrusters and two verniers, is located in the forward
fuselage and the other t w o nodules, each containing 12
primary thrusters and two ver~ipr thrusters, are contaiiied
in the auxiliary propulsion suhs~-ste:n mounted on each side
of the aft fuselage.
2.2 .3 6CS caaponents. Each RCS Propulsion Package
contains a propellant storage and distribution system, a helium pressurant gas storage regulation and distribution system, a thermal control assembly, and electrical and flight
instrumentation system. Each primary thruster produces
approximately 900 pounds thrust. The vernier thrusters provide approximately 25 pounds thrust each.
2 . 2 . 4 RCS propellant supply. The hypergolic RCS pro- pellants are nitrogen tetroxide (N204) and monomethalhydrazine.
Each RCS is normally sup~lied propellants from its own dedicated set of tanks. Crossfeed lines provide the caya- bility to supply propellant to either aft. RCS thrusters from
one of the following sources:
a OMS propellant tanks
a Cargo bay kit tanks
a Pod tanks from the opposite RCS
2.2.5 RCS activation. During liftoff and ascent, the RCS is inactive with the helium isolation valves closed and the propellant isolated from the thruster bipropellant valve
inlets by the propellant isolation vazves. Prior to external
tank jettison. the propellant isolation valves, the helium
isolation valves, and the RCS docrs are commanded open and the RCS propellant and pressurization subsystems are ready
for operation
2 . 2 . 6 - RCS r.entry configuration. The forward KCS is
no; used during reentry. Prior to reentry, the forward RCS jets are deactivated, and the RCS doors are closed.
2,2 .7 Failed thruster monitoring. Guidance and control will monitor for failed thrusters. It is assumed that a faxlt word will be provided from the guidance and control computer for performance monitoring fault annunciation.
RCS configuration status. Several areas of the
RCS are not defined at this time. For the purpose of this report, these areas are assumed to be as shown on the system prints in this document.
Vernier jet location and manifold connections, RCS door instrumentation, and the guidance and control monitors
are likely change points.
3.0 FUNCTIONAL PATH ANALYSIS OF THE FORWARD RCS
3.1 Funct ional Path I d e n t i f i c a t i o n
The func t i ona l pa ths f o r t h e forward RCS a r e i d e n t i f i e d
a s RCXX on f i g u r e s 1 through 3.
3.2 Funct ional Path Descr ip t ion
RC1 i s t h e helium source b o t t l e f o r supplying helium p re s su re t o t h e f u e l tank. The b o t t l e has a volume of approximateiy 2 .02 cub ic f e e t and is p r e s su r i z ed t o 3600
p s i a p r i o r t o l i f t o f f . RC2 provides t h e same func t i oa f o r t h e ox id i ze r tank.
R C 3 through RC6 a r e h e l i - m i s o l a t i o n valves i n s e r i e s
wi th two helium r egu l a to r s . They provide helium source i s o l a t i o n and r e g u l a t e source p r e s su re t o a p rope l l an t tank
p ressure of approximately 280 p s i a .
RC7 and RC8 a r e s e r i e s p a r a l l e l check valves t h a t i s o l a t e p rope l l an t from t h e helium r egu l a to r s .
RC9 and R C l O provide over p r e s su re r e l i e f f o r t h e f u e l
and ox id i ze r tanks . They c o n s i s t of a normally open shu t -
of: va lve (SOV) i n s e r i e s wi th a b u r s t d i s c and a poppet r e l i e f valve. Over p ressure w i l l r up tu r e t he b u r s t d i s c
al low'ng excess helium t o be vented. In t h e event t h e poppet
va lve f a i l s t o r e s e a t , t h e SOV i s c losed by t h e crew.
&,,
, : 1
. T
OM
AN
IFO
LD
S .
..
A
/
.-- \&
'I FOLDS
R C l l and RC12 a r e p r o p e l l a n t ho ld ing tanks . Each t ank has a volume of approximate ly 14 cubic f e e t .
RC15 through RC18 a r e t a n k i s o l a t i o n v a l v e s used t o i s o l a t e p r o p e l l a n t f low from t h e p r o p e l l a n t t anks t o t h e
manifold i s o l a t i o n va lves .
RC19 through RC28 a r e manifold i s o l a t i o n va lves . Each
v a l v e c o n t r o l s t h e f low o f f u e l o r o x i d i z e r t o t h e i n l e t o f
f o u r primary o r two v e r n i e r j e t s . I n t h e even t of a f a i l e d -
on t h r u s t e r o r a l e a k , b o t h t h e f u e l and o x i d i z e r . H a n i f o l d i s o l a t i o n va lves a s s o c i a t e d w i t h t h e f a i l u r e a r e c losed .
RC29 through RC64 a r e engine i n l e t v a l v e s f o r f u z l and
o x i d i z e r . Each engine has a d e d i c a t e d j e t d r i v e r which
opens and c l o s e s t h e f u e l and oxid ' izer i n l e t v a l v e s on
ccrnmand.
3.3 Opera t ing Func t iona l Pa ths
Func t iona l p a t h s a r e combined i n t o o p e r a t i n g f u n c t i o n a l
p a t h s f o r f a u l t d e t e c t i o n and a n n ~ r ~ c i a t i o n . T h e o p e r a t i n g
f u n c t i o n a l p a t h s a r e i d e n t i f i e d a s ORCXX. A t o t a l of 16 f u e l and 16 o x i d i z e r f u n c t i o n a l p a t h s e x i s t i n t h e f0rwai.d
RCS system.
A l l f u n c t i o n a l p a t h s f o r f u e l a r e i d e n t i c a l from t h e
helium source t o t h e f u e l t ank i s o l a t i o n va lves .
O R C l = (RC1) (RC3 + RC5) ( R C 7 ) (RCll)
In addition, two sets of eight engjnes have a common path through the fuel tank isolation valves.
0RC2 = (ORC1) (RClS)
Five groups of engines have common fuel paths through
the manifold isolation valves.
0RC4 = (ORC2) (RC21) for Manifold A
ORCS = (ORC3) (RC22) for Manifold C
0RC6 = (ORC2) (RC23) for Manifold B
ORC7 = (ORC3) (RC24) for Manifold D
ORC8 = (ORC2) (RC19) for Yanjfold E
The complete fuel flow path for each engine is the
manifold path combined with the engine inlet. The fuel
flow paths for the engines are:
ORC9 = (ORC4) (RC41) for Jet 1
ORClO = (ORC4) (RC49) for Jet 5
ORCll = (ORC4) (.RC33) for Jet 9
ORC12 = (ORC4) (RC57) for Jet 13
ORC13 = (ORC5) (RC37) for 3et 3
ORC1-I = (ORC5) (RC45) for Jet 7
ORCl5 = (ORCS) CRC29) for Jet 11
ORC16 = (ORC5) (RC53) for Jet 15
ORCl8 = (ORC6) (RC42) for Jet 6
ORC19 = (ORC6) (RC58) for Jet 10
GRC21 = (ORC7) (RC46) for Jet 4
ORC22 = (OP77) (RC38) for Jet Q
ORC23 = (ORC7) (RC54) for Jet 12
ORC24 = (ORC7) (RC30) for Jet 16
ORC5l = (ORC8) (RC61) for Jet 101 T
ORC52 = (ORC8) (RC62) for Jet 102 : I
Oxidizer flow paths are similar and compiled as follows:
Common Path to Tank Isolation Valves
OF.C25 = (RC22 (RC4 + RC6) (RC8) (RC12)
Comon Paths through Tank Isolation valves
ORC26 = (ORC25) (RC18)
ORC27 = (OKC25) (RC16)
Common Paths to Manifolds
ORC28 = (ORC26) (RC25) A Manifold
ORC29 = (ORC27) (RC27) C Manifold
ORC30 = (ORC26j (RC26) B Manifold
ORC31 = (ORC27) (RC28) D Manifold
ORC32 = (ORC26) (RC20) E Manifold
Oxidizer Flow Paths to Jet:
ORC33 = (ORC28) (RC43) for Jet 1
ORC34 = (ORC28) (RC51) for Jet 5
ORC35 - (ORC28) (RC35) for Jet 9
ORC36 = (ORC28) (RC59) for Jet 13
O R C 3 7 = (ORC29) (RC39) for Jet 3
ORC38 = (ORC29) (RC47) for Jet 7
for Jet 11
for Jet 1 5
for Jet 6
for Jet 10
for Jet 4
for Jet 8
for Jet 12
for Jet 16
for Jet 101
for Jet 102
4.0 MEASUREMENT REQUIREMENTS FOR FAULT DETECTiON
AND ANNUNCIATION - FORWARD RCS
4.1 FDA Measurements
Table 1 lists the primary, correlation, and precondi-
tioning measurements required for fault detection and
annunciation. The table identifies 2 8 new measurm2nts not
included in the Master Measurements List, dated November 16,
1973. Measurement justification is also included in table 1.
Figures 4 through 6 show the approximate location of the
forward RCS measurements.
4 . 2 Description of Parameters to be Monitored
4.2.1 Helium source pressure. Helium source pressure
is used for propellant gauging and is the best overall
indicator of system integrity. In the event the source
pressure measurement is lost, the system status and propel-
lant remaining cannot be determined; th~refore, redundant
source pressure measurements should be added.
4 . 2 . 2 Propellant pressures. Helium SOV positions
provide a preconditim check to determine if the system is
static or dynamic. Regulator output is required to isolate leaks and failed components such as regulators, helium SOIJ'j,
and vent valves.
Tank outlet pressure provides a correlation check for
regulator output pressure.
Figu
5. -
Fo
rwar
d
lra
nif
old
s B
, L!,
aqd
E
inst
rllm
en
tati
on
.
4 4.2.3 Manifold ?ressures. Tank outlet SOV's and mani- a
fold isolation valves provide precondition checks for mani- ; 5
fold pressme checks. $ : 1
Manifold pressure trznsducers should be added to provide J
rapid leak isolation capabilities. Heat soak back monitoring
for failed manifolds would also be provided by these transducers.
4.2.4 Thruster temperature. Thr-ster temperature
trmsducers should be monitored for overtemperature during bums and for leak indications during quiesceat periods.
In addition, the engine procurement specification
prosides for burn-through nionitors on each engine. It is
anticipated that they will be monitored by PMS.
4.3 Leak Detection Methods
4.3.1 Quantity remaining. P1emission halium profiles
are not adequate for helium monitoring. Leaks can be
detected by correlating helium source pressure with quantity
of propellant remainjng. Since quantity remaining is gauged
by helium pressure, volume, and temperature, quantity measure-
ments become inaccurate when a leak is introduced into the
system. A thruster-on time multiplied by flow rate calculation
shc,uld be correlated with qaantity remaining.
4.3.2 Delta pressure. The helium source pressure delta
for fuel and oxidizer should be nearly constant, since equal volumes of fuel and oxidizer are being consumed. A change
in the delta pressure is indicative of a leak.
*F =
Primary
C =
Correlation
X = Prec~ndition
TABLE 1.-
MEASUREAENTS REQUIRED
FOR FORWARD RCS FAULT
DETECTION AND ANNUNCIATION
**M
= New Measurement Required
Measurement * u e T
Soft limit
High
low
04A
RCS
fwd
He fuel
tk p
ross
-
RCS
fwd
He fuel
tk press
NA
NA
NA
N
A
P P
1
Hard
High low
Propellant
remaining
dependent
Propellant
remaining
dependent
ZP1120A
RC
S fwd
He fuel
TBD
TBD
limiteCorrelation
measurement
TL120A
T1122A
C
Operating
functional
path
TBD
TBD
RC
S fwd He
fu RGL
TR
Isla valve 1
lmxnm
r-
RCS
fwd He
fu R
GL
TR
Isln valve
2-
-
Hea
t and
cold
soak.
Leak
monitor.
RC1
ORCl
N A
Position de:'ines
1 type of monitoring
static or
dynamic
Position defines
type of mtnitoring
sta
tic
or
dynamic
1 S
System status and,
leak monitor
Justification
RC 1
ORC1
N A
h' A
I
System status lost
if P1004 fails.
Should be
redundant
S
t a u
RC 3
ORC1
ORC 1
T1120A
NA
N A
NA
NA
kc 1
ORC1
NA
NA
NNA
NA
TABLE 1.-
MEASUREMENTS REQUIRED FOR FOR'AARD
RCS
FAULT
DETE
CTIO
N AN
D AN
NUNC
IATI
ON -
Continued
?
. , -
I 1
Soft li
mit
Hard
li
mit
Correlation
Operating
Mea
sure
men
t u S
func
tior
ial
Justification
i I
e High
low
High
Tow
me
asur
emen
t path
I
I ,
I -
- 1
300
275
~1172~
leak a
nd o
ver-
I p
sig
p
sig
(
Tl174A
ORC
pressurization
moni
tor
Tank p
rnssure
300
275
N A
monitor
if r
eg
P
I lp
sig
psi
g
ORC
pressure trans-
.I
--
-
duce
r fa
ils
1 w
RCS fw
d fu
P
TBD
TBD
/ TBD
TBD
i st
ora
ge
tank1
NA
OR
C
soak
. Leak
RC1l
dete
ctio
n.
I Mo
te:
Measurement
NA
NA
N A
RC17
No.
may ch
ange
I
on n
ew
so
,
I , .
ORCZ
conf
igur
atio
n . I
F
OR
C2
Heat
soakback
tCS fw
d f"
P
TRD
TBD
TBD
TBD
anif
old
ORC 3
Heat
so
akb
ack
te
mp
No 2
C
''
I
TABLE
1.
s-
MEASUREMENTS REQUIRED FOR
FORWARD RCS FAULT
DETECTION AND ANNUNCIATION -
Continued
&lustif ication
!: I Isolated manifold)
I e C
S fwd fu
dpl NA
A
I hruster Is1
monitor I/
Isolated manifold1
I CS fwd f
u
Is1
NA
( NA
NA
I monitor 4
Isolated manifold
Isol. ted manifold
RCS fwd fu
NA
NA
NA
NA
NA
RC22
thruster lslnP
va
lve B
0RC6
70k
RCS fwd fu
j,
1- A
h
f A
1
1 A
1
1 A
11
A
RC24
monitor
I I
TBD
TBD
P1182A
0RC4
TBD
TBD
P1182A
ORC6
hea
t soakback
Leak isolation
hsat s
oakback
Lea
k isolation
' heat soakback
'?T
?Zk isolation
&at
soakback
TABLE 1.-
MEAS
UREM
ENTS
REQUlRE!) FOR FORWARD R
CS FAULT
DETE
CTIO
N A
ND
ANNUNCIATICN -
Continued
b
Measurement
2P
11
86
A
* u e C
P
RCS fwd oxid
propellant
man
f ress
v4
~1
11
68
A
icS fw
d oxid
stor tank
Soft li
mit
High
low
NA
NA
I t-' 0
RCS fwd o
xid
tank s
hut-
X off v
al J
C
RCS fwd ox
id
tank s
hut-
X off v
alve
189-4
ECS fw
d P
anifold
temp No
1
I
NA
NA
NA
i
-
--
- -
T
NA
NA
NA
NA
TBD
TBD
Hard li
mit
High
low
300
275
psig
psig
--
--
-.
--
--
NA
NA
NA
N
A
TBD
TBD
RC18
ORC25
RC16
ORC25
ORC26
Justification
Tank pressure
monitor if
reg
pressure trans-
ducer fails
p TBD
TBD /TBD
TBD
7 1 1 I I
L
--
Correlation
measurement
NA
Note
: Measurement
NO.
may
change
on n
ew
configuration
I Determine tank use
Note:
Measurement
Operating
functional
path
0RC2 5
No.
may
change
on new
configuration
Heat soakback
Heat and cold soak
NA
i.
ORC25
leak d
,ete
ctio
n
RC12
TABLE 1.-
MEASUREMENTS REQUIRED FOR FORWARD RCS FAULT
DETECTIOK AhD ANKUNCIATION -
Continued
-
-
Soft limit
High
low
Measurement
T1190A
TBD
TBD
* U S
e
Hard limit Correlation Operating
RCS
fwd oxid
manifold
RCS
fwd oxid
thruster Isln
valve
A
RCS
fwd oxid
thruster Isln
valve
C
V42X1058E
RCS
fwd oxid
thruster Is ln
RCS
fwd oxid
thruster Isln
valve D
manifold
justification
High
low
measurement
TBD
TBD
PJ A
ORC27
Heat soakback
( RC25
1 Isolated manifold
ORC28
monitor
I I KC2 7
Isolated manifold
ORC29
monitor
I I I
RC26
~lsolated manifold
ORC30
monitor
NA
N A
NA
RC28
Isolated manifold
ORC31
monitor
TBD
TBD
P1186A
ORC2 8
Leak isolation
1 heat soakback
N #
TABLE
1,-
MEASUREMENTS REQUIRED FOR FORWARD FAULT
DETECTION AND ANNUNCIATION - Continued
S t a
u S -
Operating
functional
path
ORC30
ORC 2 9
ORC31
Measurement
kCS fwd B
manifold
oxid press
RCS f wd C
manifold
oxid press
RcS fwd D
manifold
ORC33
Ovcertemp and
Justification
Leak isolation
heat soakback
Leak isolation
heat soakback
Leak isolation
heat soakback
Hard limit
High lsv
TBD
TBD
- - -
TBD
TBD
TBD
TBD
--
KCS fwd
P
thruster injn * 'J
, e P
P P
Correlation
measurement
P1186A
- - - -
P1186A
P1186A
TBD
TBD
Soft limit
High low
NA
N
A
NA
NA
NA
N
A
I
RCS fwd
I
TBD
TBD
Jet 1
leak monitor
I ORC5
NA
P TBD
TBD
TBC
TBD
N A
ORC37
Temp and leak
thruster injn
Jet 3
monitor
P
thruster injn
RCS fwd
P thruster injn
temp No 7
I
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
NA
NA
ORC34
Jet 5
ORC14
ORC38
Jet 7
Temp and leak
monitor
Temp and leak
monitor
TABLE 1.- MEASUREMENTS REQUIRED FOR
FORWARD FAULT
DETECTION AND ANNUNCIATION -
Continued
Measurement * u e
ORCll
RCS fwd
P TBD
TBD TBD
TED
N A
ORC35
Temp and leak
thruster injr
temp Nu 9
1 Jet 9
monitor
- RC15
QCS
fwd
Temp and
leak
[thruster in j
monitor
t
Soft limit
High
low
(RC
S fwd
P thruster injn P
thruster in jn
temp No 15
V42T1130A
I
Hard limit
High
low
TBD
TBD
TBD
TBD
5
Correlation I O
perating
t a
functional
Justification
measurement
path
u
--
-
S
TBD
TB9
t NA
ORC36
Temp and
leak
P TBD
TBD
I thruster injn
TBD
TBD
TBD
TBD
TBD
TBD
V42T1134A
RCS
fwd
thruster injn P
temp No 6
Jet 13 monitor
ORC16
N A
ORC40
Temp and
leak
Jet 15 monitor
ORC21
NA
ORC45
Overtemp and
Jet 4
leak monitor
ORC18
Overtemp and
NA
0RC4 2
Jet 6
t A
leak monitor
L
- TBD
TBD
C, C, C, k A 4 k * k S acd W E d P ) L d $ 0 > a , $ 0 , 0 0 4 O r l
TAB
LE
1 .-
MEA
SUR
EMEN
TS
REQ
UIR
ED
FOR
FORW
ARD
FA
ULT
DE
TE
CT
ION
A
ND
A
NN
UN
CIA
TIO
N -
Co
nti
nu
ed
- P
I P
VI
-
* e
P
t M
easu
rem
ent
Rcs
f wi
thru
ste
r b
urr
P
thru
No
1
RC
S fw
d th
rus
ter
bu
rr
thru
No
3
RC
S fx
d
thru
ste
r b
um
p
thru
No
5 R
CS
fwd
thru
ste
r b
urn
? th
ru N
o 7
CS
fwd
thru
ste
r b
urr
P
thru
No
9 R
CS
fwd
thru
ste
r b
urr
P
thru
h'o
11
CS
fwd
thru
ste
r b
urr
P
thru
No
13
R
CS
fwd
tnru
ste
r b
urr
P
thru
No
15
So
ft l
imit
Hig
h
low
NA
NA
NA
N
A
NA
N
A
NA
N
A
NA
N
A
NA
N
A
NA
N
A
NA
N
A
Har
d
lim
it
Hig
h
low
NA
M
A
NA
N
A
Co
rre
lati
on
,mea
sure
men
t
NA
NA
--,
NA
N
A
S t a t u S N N I
Op
era
tin
g
fun
cti
on
al
pa
th
OR
C9
OR
C33
NA
1
Ju
s+
<fi
ca
tio
n
Sa
fety
mo
nit
or
OR
ClO
O
RC
34
Je
t 5
O
RC
14
OK
38
J
et
7 O
RC
ll
OR
C35
J
et
9 O
RC
15
OR
C39
J
et
11
OR
C 1
2
ORC36
Je
t 1
3
OR
C16
O
RC
40
, J
et
15
Sa
fety
mo
nit
or
Sa
fety
mo
nit
or
.
Sa
fety
mo
nit
or
Sa
fety
mo
nit
or
Sa
fety
mo
nit
or
Sn
fety
mo
nit
or
N
N N N N I
J
I
NA
hA
I
N A
Je
t 1
--
OR
C13
O
KC
37
Je
t 3
A
-
NA
N
A
NA
N
A
NA
N
A
NA
N
A
Sa
fety
mo
nit
or
N A
NA
N A
NA
TABLE 1.-
MEASUREMENTS REQUIRED.FOR FORWARD FAULT
DETECTION AN9 ANNUNCIATION - Continued
. r * Soft limit
u Measurement e High low
NA
Hard limit
High low
NA
NA
NA
NA
NA
NA
NA
KA
NA
NA
NA
NA
NA
N A
NA
P
I w
O\
Jet 102
thru No 10
~CS
twd
thruster burrP NA
NA
thru No
12
RCS
fwd
NA
NA
NA
bhru No 102
1
RC
S fw
d
thruster h
unP
thru No 6
RCS
fwd
thruster burnP
thru No
8 kC
S
fwd
thruster burxP
t
Correlation
measurement
NA
NA
-- NA
NA
NA
NA
NA
NA
Operating
functional
path
ORC21
ORC45
Jet 4
ORC18
OR
C42
Jet 6
Justification
Safety monitor
Safety monitor
NA
NA
N A
NA
NA
rs
t a u S N - N
Safety monitor
I
ORC46
Jet 8
0RC29
OR
C43
Jet 10
OR^ 3
ORC47
Jei 12
OR
CZ
4 ORC48
Jet 16
Om49
ORC51
Jet 101
OR
~O
ORC52
N -'
Sa
fety
monito,
N
Safety moritor
IN
Safety monitor
Safety monitor
N N
Safety monitor
TABLE 1.-
MEASUREMENTS REQUZRED FOR FORWARD FAUL'l'
DETECTION AND ANNUNCIATION -
Concluded
iard limit Correlation
I
Operating
knct ional -- Justification
I /*I S
nit limit
Measurement U
I Isl
I Jel high
low
iigh
low
I measurement
path
inam
o
xid
ress
iP
NA
Leak isolation
Leak isolation
Failed manifo: d
manitor
manifold f
Isln valve
F Failed manifold
monitor
manifold o
Safety
I -4
- bent valve
IF
Safety -
vent valve
[sov
p
5.0 FUNCTI9NAL PATH ANALYSIS OF THE
AFT RCS
5.1 Func t iona l P a t h I d e n t i f i c a t - i o n
The f u n c t i o n a l p a t h s f o r t h e a f t RCS a r e i d e n t i f i e d
as RCXX on f i g u r e s 7 th rough 10.
5.2 F u n c t i o ~ l a l Pa th D e s c r i p t i o n - A f t L e f t RCS
RC70 i s t h e helium s o u r c e b o t t l e f o r supply ing hel ium
p r e s s u r e t o t h e f u e l tank . The b o t t l e has 2.02 c u b i c f e e t
volume and is p r e s s u r i z e d t o 3600 p s i a p r i o r t o l i f t o f f .
RC71 provides t h e same f u n c t i o n f o r t h e o x i d i z e r t anks .
RC72 through RC7S a r e helium i s o l a t i o n v a l v e s i n s e r i e s
w i th two helium r e g u l a t o r s . They p rov ide helium i s o l a t i o n
and r e g u l a t e sou rce p r e s s u r e t o a p r o p e l l a n t tank p r e s s u r e
o f approximately 280 p s i a .
RC76 and RC77 a r e s e r i e s p a r a l l e l check v a l v e s t h a t
i s o l a t e p r o p e l l a n t s from t h e helium r e g u l a t o r s .
RC80 and R C a l p rov i3e over p r e s s w e r e l i e f f o r t h e
f u e l and o x i d i z e r t a n k s . They c o n s i s t o f a nonna l ly open
SOV i n series w i t h a b u r s t d i s c and a poppet r e l i e f va lve .
Over p r e s s u r e w i l i r u ~ t u r e t h e b u r s t d i s c a l lowing excess
hel ium t o be vented . I n t n e event t h e poppet v a l v e f a i l s
t o r e s e a t , t h e SOV i s c l o s e d by +he crew.
SOT
COT
UU
CI
U
UU
&
de:
rx:&
S3
AW
A N
OIIV
7OSI
a?
Od
INW
OJ,
RC82 and RC83 a r e p rope l l an t holding tanks. Each tank has a volume of approximately 14 cubic f e e t .
RC84 through RC89 a r e tank i s o l a t i o n valves used t o
i s o l a t e p rope l l an t flow from t h e p rope l l an t tanks t o t h e
t h r u s t e r manifolds.
RC90 through RC99 a r e manifold i s o l a t i o n valves used
t o con t ro l t he flow of p rope l l an t t o t h r e e primary j e t s o r
two ve rn i e r j e t s . In t h e event o f a f a i l ed -on t h r u s t e r o r
a leak, t h e f u e l and ox id i ze r manifold i s o l a t i o n valves assoc ia ted wi th t h e f a i l u r e a r c closed.
RC104 through RC131 a r e engine i n l e t valves f o r f u e l
and ox id i ze r , Each engine has a dedicated j e t d r i v e r which
opens and c lo se s t h e f u e l and ox id i ze r i n l e t v a l - ~ e s on
command.
5.3 Functional Path Descr ipt ion of Right Aft RCS
The r i g h t a f t RCS has components i d e n t i c a l t o those i n
t he l e f t a f t RCS. The func t iona l path desc r ip t i on i s , there -
f o r e , t h e same as t h e l e f t a f t RCS except f o r t h e func t iona l path numbering
5.4 Operating Functional Paths
The func t iona l path? of t h e a f t RCS are combined i n t o
operat ing func t iona l paths f o r f a u l t de t ec t i on and annuncia- t i on . The operat ing func t iona l paths a r e i d e n t i f i e d a s
ORCXXX. A t o t a l of 14 f u e l and 14 ox id izer operat ing func t iona l paths e x i s t i n each a f t RCS.
5.4.1 Fuel operating functional paths - aft left RCS. All 14 functional paths for fuel are identicel from the helium source to the tank isolation valves. The common fuel path is identified as:
ORClOO = RC70 (RC72 + RC74) (RC76) (RC78) (RC82)
In addition, eight engines have a common fuel path
through parallel tank isolation valves and the remaining six engines have a common path through the remaining tank
isolation valve. The fuel paths are identified as:
3RC101 = (ORC100) (RC84 + RC86)
ORClOZ = (ORC100) (RC88)
Past the tank isolation valves the functional paths
branch to the manifolds as fellows:
ORC103 = (ORC101) (RC94) Manifold A
ORC104 = (ORC101) (RC92) Wanifold B
ORClOS = ORC101 (RC90) Manifold E
ORC106 = ORC102 (RC96) Manifold C
ORC107 = ORC102 (RC98) Manifold D
The complete fuel flow functional paths for the engines are given below:
OK108 = (ORC103) (RC106) Engine 25
OW109 = (ORC103) (RC114) Engine 23
GRCllO = (ORC103) (RC122) Engine 31
0 ~ ~ 1 1 1 = (0~~104) (~~110) Engine 21
ORCllZ = (ORC104) (RC118) Engine 33
Engine 37
Engine 103
Engine 105
Engine 19
Engine 27
Engine 35
Engine 29
Eng;?e 17
Engine 39
5.4.2 Oxidizer operating functional paths - aft left RCS. The oxidizer operating functional paths are similar - to the fuel operating functional paths and are compiled as fo1:ows.
The common path to the tank isolation valve is:
ORC122 = (RC71) (RC73 + RC75) (RC77) (RC79 (RC83)
The common oxidizer paths through the tank isolation
paths are:
ORC123 = (ORC122) (RC85 + RC89)
The cormon oxidizer paths to the oxidizer manifolds are:
ORC125 = (ORC123) (RC91) Manifold A
ORC126 = (ORC123) (RC33) Manifold B
ORC127 = (ORC123) (RC95) Manifold E
ORC128 = (ORC124) (RC97) Manifold C
ORC129 = (ORC124) (RC9S) Manifold D
The oxiLzer operating functional flow paths t o the engines are defined as follows:
ORC130 = (OAC12S) (RC107) Engine 25
ORC131 = (ORC12S) (RC115) Engine 23
ORC132 = (ORC125) (RC123) Engine 31
ORC133 = (ORC126) (RC111) Engine 21
ORC134 = (ORC126) (RC119) Engine 33
ORC135 = (ORC126) (RC125) Eugine 37
ORC136 = (ORC127) (RC129) Engine 103
ORCi37 = (ORC127) (RC131) Engine 105
ORC138 = (ORC128) (RC113) Engine 19
ORC139 = (ORC128) (RC105) Engine 27
ORC140 = (ORC128) (RC121) Engine 35
ORC141 = (ORC129) (RC109) Engine 29
ORC142 = (ORC129) (RC117) Engine 17
ORC143 = (ORC129) (RCl27) Engine 39
5.4.3 - Fuel operating functional paths - aft right RCS. The operating functionel fuel path from the helium source
to the propellant tank SOV's is common to all 14 engines, and is identified as:
ORC200 = (RC150) (RC152 + RC154) (RC156) (RC158) (RC162)
The cperating functional fuel flow path.divides into two paths at the tank SOVts. They are defined as follows:
The five operating functional fuel flow paths to the
fuel manifolds are defined by:
ORC203 = (ORC201) (RC170) Manifold A
ORC204 = (ORC201) (RC172) Manifold B
ORC2OS = (ORC201) (RC174) Manifold E
ORC206 = (ORC202) (RC176) Manifold C
ORC207 = (ORC202) (RC178) Manifold D
The complete operating functional fuel flow paths for
the engines are given below:
ORCZG!? = ( 0 ~ ~ 2 0 3 ) (RC188) Engine 26
ORCiO9 = (OT<C20?] (RC196) Engine 24
GRC210 = (ORcZu.7) (RC%OF) Eiigine 38
C X L 1 1 = (ORCZG-', [RClCe) '-ngine 28
ORC212 = (ORC204) [;:??-94) Engine 22
ORC213 = (ORC204) (RC202) Engine 33
ORC214 = (ORC205) (RC208) Engi~.e 104
ORC215 = (ORC205j (RC210) Engine 106
ORC216 = (ORC206) (RC190) Engine 20
ORC217 = (ORC206) (RC189) Engine 34
ORC218 = (ORC206) (RC204) Engine 40
ORC219 = (ORC203j (RC184) Engine 30
ORC220 = (ORC207) (RC192) Engine 18
OkC221 = (ORC207) (RC200) Engine 36
5.4.4 Oxidizer operating functional paths - aft right i
RCS. The oxidizer operating functional flow path from the - i 1
helium source to tank SOVis is common to all engines and 1 I
is defined as : 1 ORC222 = (RC151) (RC153 + RC155) (RC157) (RC159) (RC163)
1 Z
A
The oxidizer operating functional flow paths through I . -
the tank SOV1s are defined as:
ORC223 = (ORC222) (RC165 + RC169)
The oxidizer operating functional flow paths to the I 1
oxidizer manifolds are:
0RC225 = (ORC223j (RC171) Manifold A
ORC226 = (ORC223) (RC173) Manifold B
ORC227 = (ORC223) (RC175) Manifold E
ORC228 = (ORC224) (RC177) Manifold C
ORC229 = (ORC224) (KC179) Manifold D
The complete oxidizer operating fu~ctional flow paths for the enginzs are given below:
ORC230 = (ORC225) (RC189) Engine 26
ORC231 = (ORC225) (RC197) Engine 24
OR5232 - (ORC225) (RC207) Engine 38
ORC233 = (ORC226) (RC203) Engine 32
ORC234 = (ORC226) (RC195) Engine 22
ORC235 = (ORC226) (RC187) Engine 28
ORC236 = (ORC227) (RC209) Engine 104
O R C 2 3 7 = ( O R C 2 2 7 ) ( R C 2 1 1 ) Engine 106
O R C 2 3 8 = ( O R C 2 2 8 ) ( R C 2 0 5 ) Engine 40
O R C 2 3 9 = ( O R C 2 2 8 ) ( R C 1 9 9 ) Engine 34
O R C 2 4 0 = ( O R C 2 2 8 ) ( R C 1 9 1 ) Engine 2 0
O R C 2 4 1 = (ORC'229) ( k c 1 8 5 1 Engine 30'
O R C 2 4 2 = ( O R C 2 2 9 ) ( K C 1 9 3 ) Engine 18
O K 2 4 3 = ( O R C 2 2 9 ) ( R C 2 0 1 ) Engine 36
6 . 0 MEASUREMENT REQUIREMENTS FOR FAULT DETECTION AND ANNUNCIATION - AFT RCS
6.1 FDA Measurements
Tables 2 and 3 list the primary, correlation, and pre- conditioning measurements required for fault detection and
annunciation for the right and left aft RCS. The tables
identify 72 new measurements not included in the Master
Measurements List, dated November 16, 1973. Measurement
justification is also included in tables 2 and 3. Figures 11
through 14 show the approximate location of the aft RCS
measurements.
6.2 Description of Parameters to be Monitored
6.2.1 Helium source pressure. Helium source pressure is
used for propellant guging and is the best overall indicator
of system inrc~rity. In the event the source pressure
measurement fails, the system status and propellant remaining
cannot be determined; therefore, redundant source pressure
measurements should be added to the f o ~ r helium tanks.
6.2.2 Propellant pressures. Helium SOV positions provide
a prscondition check to determine if the system is static
or dynamic. Regulator output is required to isolate leaks
and tailed components such as regulators, helium SOVfs, and
vent valves.
Tank outlet pressure provides a correlation check for ?:
regulator output pressure. :,;l 4
6.2.3 Manifold pressures. Tank outlet SOV's, manifold
isolation valves, and RCS crossfeed val-ve positions provide precondition checks for manifold pressure checks.
Manifold pressure transducers should be added to pro-
vide rapid leak isolation capability and engine inlet pressure
monitoring during crossfeed operation. Heat soak back moni-
toring for isnlated manifolds would zlso be provided by
these transducers.
6.2.4 Thruster temperature. Thiuster temperature
transducers should be monitored for overtemperature during
burns and far leak indications during quiescent perjods.
In addition, the engine procurement specification pro-
vides for burn through monitors on each engine. It is antici-
pated that they will be monitored by PMS.
6.3 Leak Detection Methods
6.3.1 Quantity remaining. ?remission helium profiles
are not adequate for helium monitoriag. Leaks can be detected
by correlating helium source pressure with the quantity of
propellant remaining. Since quantity remaining is gauged by
helium pressure, volume, and temperature, quantity measurements
become inaccurate when a leak is introduced into the system.
A thruster-on time mul.tipl;ed by flow rate calculation shc~ld be correlated with quantity remaining. Care must be exfrcised
to charge propellant to the proper tanks during crossfeed
operation.
6.3.2 Delta pressure. The helium source pressure
delta for fuel and oxidize, should be nearly constant, since
equal volumes of fuel and oxAdizci- are being consuned. A change in the delta pressure is indicative of a leak.
TA
BL
E
2.-
R
IGH
T A
FT RCS MEASUREMENTS F
OR FD
A
*P
= PI imary
C
= CorreJ.ation
X =
Precondition
**N
= New Measurement Required
* U j M
easurement
Soft limit
High
low
-
V4Z
P20
04A
e
oxid tank
pressure
RCS R-aft He
oxid tank
pressure
Hard limit
tii
~h
low
Propellant
remaining
dependent
Propellant
remaining
dependent
Propellant
remaining
P !
P
RCS R-aft He
dependent
Propellant
remaining
dependent
33 t
Justification
Nil
fuel tank
pressure
RCS
R-aft He
fuel tank
pressure I
Y2
2C)O
ZA
RCS R-aft He
NA
NA
1 N
A 1 Rc
153
~typeyOf
11 ORC222 monitoring static
or d
namic
ORC222
RC151
ORCZZZ
Correlation
measilrement
System status
'propellant gauging
leak monitoring
P
propellant gaugin
leak monitoring
status and gauglna
Operating
functional
path
RC150
oRC200
ORC200
RC151
u
S
lost if PZOOZA
fail
s N
Status and gaugint
lost if P2004A
fails
System status
zosition defines
N
TA
BL
E
2.-
R
IGH
T
AF
T
XS
MEA
SUR
EMEN
TS FOR
FDA
- Continued
r * Soft limit Hard limit Correlation Operating
U Measurement
functional
e :ligh
low High
low
measurement
path
Justification 1
monitoring static
CS R-aft He
NA
X
rgltr
alve 2
ORC222
Safety insures
1 I
*C~R-aftHem~
3X
RLF
valve
V41X2022E
vent line open -
NA
~N
A
NA
~ NA
RCl61
ORC222
Safety insures
I I vent line open
Position defines
type of
monitoring static
RCS R
-aft He
fu RLF
valve
V42X2036E
RCS R-aft He
fuel rgltr
Isln valve 1
V42X2038E
RCS R
-aft He
fuel rgPtr
Isln valve 2
b42~2048~
type of
monitoring static
Isolated manifold
monitor
NA
N
A
NA
N.4
NA
NA
NA
NA
NA
N A
NA
NA
%CSR-aft
xdzr thruste P
IN
A
NA INA
NA
N A
RC171
Isln valve A
N A
NA
N.4
ORC225
RC160
ORC200
RC152
ORC200
RC154
ORC200
TA
BL
E 2.-
RIGHT AFT RCS MEASUREMENTS FOR F
DA
- Continued
Measurement
V42X2050E
RCS R-aft
oxdzr
thruster
Isln valve B
V42X2051E
RCS R-aSt
oxdzr
thruster
Xsln valve C
V42X2052E
RCS R-aft
oxdzr
Hard limit
High
low
NA
N
A
NA
N
A
NA
N
A
NA
N A
NA
* u e P P P
Soft limit
digh
low
NA
N
A
NA
NA
fJA
NA
Correlation
measurement
NA
NA
NA
thruster
Isln- v~lve D
V42X2054E
RCS
I;-aft
fu thruster
is01 valve
A V42X2055E
Operating
functional
path
RC173
P
:csR-aft
,, NA fu thruster
P
Justification
Isolated manifold
1 ORC226
NA
monitor
Isolated marifold
monitor
Isolated manifold
monitor
Isolated manifold
monitor
Isolated manifold
monitor
i
N A
N A
N A
NA
is01 vzilve
s t a
u S
RC177
ORC228
RC179
ORC229
RC170
ORC201
RC172
ORC204
+
- --
. .
L
- -
-- -
TABLE 2.-
RIGHT AFT RCS MEASUREMENTS FOR FDA -
Continued
-
-
'manf press
1
hr42~2066~ I
I 1
I I
I
-
Measurement
V42X2056E
RCSR-aft
fu thruster
is01 valve C
* U e
Soft limit
High
low
NA
NA
RCS
R-aft
fuel rgltr
outlet press
V42P2052A
RCS R-aft
oxdzr rgltr
outlet press
V42P2P64A
RCS R
-aft
IC
oxd-.r prplt
manf press
Hard limit
High
low
NA
NA
Isolated mznifold
monitor
~orreldt
io
n7
for RGLTR
V42X2058E
p
o\
RCS R-aft
I NA
w
fu thruster
I-'
TBD
TBD
1
Correlation
measurement
N A
TBD
TBD
TBD
TBD
NA
NA
TBD
TBD
Operating
functional
path
RC176
ORC205
RCS R-af
, Ci TBD
TBD I TBD
TBD
fuel prplt
300
270
psia psia
-
Justification
Isolated manifold
monitor
NA
NA
RC178
ORC207
NA
P2060A
ORC200
+1
300
270
' PZ064A
psia prin /
__
ORC222
ORC200
Correlation
for P2062A
I I
przssure monitor
leak detection
ORC222
Tank over-
pressure monitor
leak detection
TA
BL
E
2.-
RIG
IIT
AF
T R
CS
M
EASU
REM
ENTS
FO
R
FDA
- C
on
tin
ue
d
Mea
sure
men
t I
So
ft
li
mi
l
Har
d
li
mi
t
Hig
h
low
So
rre
iati
on
mea
sure
men
t
- --
Op
era
tin
g
'un
ct i
on
al
pa
th
Ju
sti
fic
ati
on
H
igh
lo
w
-
He
at
and
c
ola
soa
k
Hea
t an
d
co
ld
soa
k
TB
D
TB
D
TB
D
TB
D
TB
D
TBD
TBD
TBD
Hea
t an
d
co
ld
soa
k
TB
D
TB
D
'TB
D
TB
D
TBD
T
BD
TBD
TB
D
~-
Hea
t an
d
co
ld
soa
k
Tem
p an
d
lea
k
mo
nit
or
TB
D
TB
D
TBD
T
BD
Tem
p an
d
lea
k
mo
nit
or
TB
D
TB
D
TBD
TB
D
TAB
LE
2.-
RIG
HT
A
FT
RC
S M
EASU
REM
ENTS
FO
R
FDA
-
Co
nti
nu
ed
- a:. .. .
Mea
sure
men
t
8A
RC
S R
-aft
RC
S R
-aft
* U
S e
rP
fP
rP
C\
l
TBD
TB
D
thru
ste
r ln
jrP
RC
S R
-aft
TB
D
TBD
th
rus
ter
injr
P
tem
p
No
32
1
thru
ste
r in
j
So
ft
li
mi
t
Hig
h
low
TBD
TE
D
TB
D
TB
D
TB
D
TB
D
TBD
TB
D
I-'
tem
p N
o 24
W
V
42T
2132
A
RC
S R
-aft
th
rus
ter
inj
thru
ste
r in
jrP
RC
S R
-aft
TB
D
TBD
__
__
__
_-
TBD
TB
D
Har
d
li
mi
t
Hig
h
low
TBD
TB
D
TRD
T
BD
TB
D
TBJI
TBD
TB
D
Co
rre
lati
on
mea
sure
men
t
NA
N A
Tem
p a
nd
le
ak
mo
nit
or
Tem
p a
nd
le
ak
mo
nit
or
NA
NA
-
0RC
21.9
OR
C24
1
OR
C21
3
OR
C23
3
Op
era
tin
g
fun
cti
on
al
pa
th
OR
C23
4
OR
C21
2
- --
jus
tifi
ca
tio
n
Tem
p a
nd
le
sk
mo
nit
or
Tea
p
and
le
ak
m
on
ito
r
Tem
p an
d
lea
k
mo
ait
or
NA
-
rt
t a u
S
I
GR
C20
8
0~
~2
30
- --
-
OR
C23
1
OR
C20
9 1 1 i 9
RC
21
1
NA
O
K2
35
Tem
p a
nd
le
ak
m
on
ito
r
TAB
LE
2.-
R
IGH
T
AFT
R
CS
MEA
SUR
EMEN
TS
FOR
FD
A - C
on
tin
ue
d
r
Mea
sure
men
t
V42
TZ
140A
R
CS
R-a
ft
thr
us
ter
in
j
RC
S R
-aft
th
ru
ste
r i
njr
?
i.!
04
:6
RC
S R
-aft
th
ru
ste
r i
n j
tsm
p
No
38
V
42T
2146
A
RC
S
R-a
ft
thr
us
ter
in
j te
mp
N
o 4
0
V42
T21
68A
R
CS
R-a
ft
,"
NA
N
A
TBD
T
BD
N
A
I O
RC
163
Co
rre
l3ti
on
fo
r
-
ox
dz
r ta
nk
T
2070
A
-- R
CS
R
-aft
S
NA
N
A
TB
D
TBD
N
A
OR
T.1
62
Co
rre
lati
on
fo
r
fu
el tank
T2
06
8A
~
sh
ell
tem
p
* L' e
rP
P
rP
rP S
oft
l
im
it
Hig
h
low
TBD
T
BD
TB
D
TB
D
TB
D
TB
D
TB
D
TBD
I
Har
d
li
mi
t
Hig
h
low
TB
D
TBD
TBD
T
BD
TBD
TB
D
TBD
T
ED
Op
era
tin
g
fun
cti
on
al
pa
th
OR
C21
7
OR
C23
9
OR
C22
1
OR
C24
3
OR
C2
11
OR
C23
2
OR
CZ
18
OR
C23
8
I Co
rre
lati
on
me
asu
rem
en
t
NA
NA
N A NA
Ju
sti
fic
ati
on
Tem
p a
nd
le
ak
s t a u S -
. .-
. . -. -
--.-
- m
on
ito
r
Tem
p a
nd
le
ak
mo
nit
or
t
Tem
p a
nd
le
ak
mo
nit
or
Tem
p a
nd
le
ak
mo
nit
or
~-
-
r
TA
BL
E
2.-
RIG
HT
AF
T
RC
S M
EASU
REM
ENTS
FOR
FDA
- Coqtinued
p~
--f
fuel m
anif01 P
bx manifold
f~
bx m
anifold
b.J
- Soft limit
High
law
TB
D
TB
C
TBD
TB
D
.- -
TB
D
TR
D
TBD
TB
D
-- ---
-
Hard limit
High
low
TB
D
TBD
TB
D
TB
D
TB
D
TB
D
TB
D
TBD
Correlation
neasilrcment
NA
N A
--
TB
c T
39
i-
TB
D
TF
D
TBD
TB
D
TB
D
TB
D
I
Operating
functional
path
ORC203
i N
: -
.-A
1 N
i I I I - -. --
--. TB
D
TBD
TB
D
TB
D
N 7
4
Leak isolbtion
Leak isolation
Le
ak
isolation
N A
NA
N A
N --
7 I N
' I
Justification
Leak isolation
Leak isulaii.on
CRC205
- ORC225
ORC226
TB
D
TB
D
1 TRD
Tel
l 1
Nil
f :I a l
- -
I S N
- .- -
4
Leak isolation
Leak isolation
ORC228
NA
NA
I
N i -.-
L !
ORC204
ORC206
ORC207
Leak isolation
,-
Z - C 0 .rl c, d rl 0 V) -4
24 rd a, 4 - r. c 4 N U Pr: 0
-
< Z
-- ca ffi b
ca m r+ - cl a I+
E9 b - a 'u r-'
.' 0 4 rcr 3
e : rb
1 E
? 'C L!?.%.
TA
BL
E
2.-
R
ICll
T
AFT
K
CS
MTi
ASU
REM
LNTS
7G
R
FDA
--
Continued
-
r 1, S
cft
lim
it
fiig
h
lo
NA
:JA
KA
NA
NA
N
A
NA
N
lr
Co
rre
lati
on
mea
sure
men
t
N A NA
Har
d
lim
it
Hig
h
1
NA
-.
NA
NA
biA
Op
era
tin
g
fun
cti
on
al
pa
th
OR
~~
Y
OR
C24
1 URCZ13
OR
C23
3 0
Rm
1/
Ju
st i
f ic
ati
on
Sa
fety
Sa
fety
'U
e
Mea
sure
men
t
k~
r<-
af
t
tkri
iste
r b
urr
P
thru
No
30
'RTTS
?-aft
tkru
ste
r b
urr
P
thru
No
32
0\
NA
NA
NA
NA
N A
N A
N A N A
N A
WA
t a
u S N
1- N
t
I b-' -.I
ths
u N
o 3
6
I.J
NA
CS
R-a
ft
thru
ste
r b
urn
P
NA
NA
N A
NA
Sa
fety
N
OR
C23
3 O
R^ 2 1
Sa
fety
N
OR
C24
3 0K
CT
1J. Sa
fet;
? Ii'
OR
C23
2 ORCZlB
Sa
fety
O
RC
238
o~'T
T33
6 S
afe
ty
OR
C21
4 O
R^
5 7
- OR
C21S
thru
ste
r b
urr
P
thru
No
34
Tx
?rR
laft
- th
rus
ter
bu
rrP
thru
No
104
RcS
K
-att
th
rus
ter
bu
rnP
li
ru Y
o 1
06
L-2
,
NA
N
A
TA
HL
E
2.-
R
IGH
T AFT RC
S ME
ASUR
EMEN
TS FOR FD
A -
Concluded
4
ox
ta
nk
lox
tank
I x
s Hard limit Correlation
t
I Justification
High
lcw
m
easu
rem
ent
I O
K2
24
I
Configuration
NA
N
A
I NA
N!, N
A ORC223
ORC223
--
-- -
Configuration
Configuration
N .
N A
I
I NA
N
A
L
N A
N A
TABLE 3.-
LEFT A
F'T
RCS MEASUREMEi:?'S FOR FD
A
Measurement
vv
RCS L-aft
He
oxdz
r tk press
RCS
L-aft
~h
He o
xdzr
I N
tk press
0 v
RCS
L-a
ict
He ox RL
F Isln valve
021E --
RCS L-aft
He fu RLF
i~~~ L-aft He
/fu RGLTR
RCS L-aft He
fu RGLTR
*P
= Primary
C =
Correlation
X =
Prezonditim
**N
= New Measurement Required
Hard limit
Hig
h
low
Propelliht
remaining
dependent
rope1 lant
remaining
dependent
- .
N.A
N A
NA
I: A
NA
N A
NA
N A
b
[Softlirni;
e High
low
P 1'
BD
T
BD
I-
sJ
**
- - - .-
.
Correlation-
measurement
P3002A
P X -. X X X
TB
L
TBD
NA
N
A
- HA
N
A
NA
N
A
NA
NA
--
Operating-
functional
path
RC71
0RClZ2
-
RC71
ORClZ2
RC81
t
Justification
I-
afet
y insures
RC80
tank ven
t line
System status
propellant ga
ugin
g le
ak monitor
u
S
oy en
Position d
ekines I
type of mon
itor
ing
static or
dynamic
I
Positicn detines
. type
af mo
nito
ring
static or
dynamic
N A
NA
Status and
gaugingj
lost
if P3002A
fails
Safety insures
tank
ve
nt line
RC72
RC
l~
~
RC74
RC1ao
N
E t 8
0 E -,-I Q, U E 4 a 0 e 4 k 4 1 9 0 Q) 3 Z 0 k VI iz,
I k cd a 0 U 2 U tJ c, .d 3 < cr. r= c , M U d. E 0 7, Z r b C E b E C Z
. r 4 rc .d a?+ -4 Q) l-l l-l c a d C *
s -4 c a ..-( c a a ace a,
k ce 4 O E P , O E P , <
Z @ Q ) h Q , Q , Z a k a a h a
=c a L=r Z 2. PO m
< Z
d t-. t-.
TABLE
3.-
LEFT AFT RCS MEASUREMENTS FOR FD
A -
Continued
I
3
k~
ai
; I P
oxdzr thruster
Isln valve C
V42X3054E
RCS L-aft
P
oxdzr thruster
i;;;I;
;;;e D
1
Measuremect
I RCSL-aft
fu thruster I 6
IIsln valve
llmm
mm
r ~RCS i-aft
Ifu
thruster I
'Isln valve B
1 I ~RCS L-aft
.fu thruster
i1sln valve C I
h42~3062~ I
RCS L-aft
fu thruster I
f~sln
valve D I
I -- - -
Soft limit Hard
Correlation
I High
low
High
low
measurement
I
pera at in^
functional
Justification
path
u S
RC97
1 ~snlated manifold)
ORC128
monitor I-&
Isolated manifold
Isolated manifold
RC92.
Isolated man
ifol
d
' Isolated manifold
Isol
ated
manifold
TABLE 3.-
LEFT AFT R
CS MEASUREMENTS FOR FDA -
Continued
r
Measurement
3063A
RCS L-aft
ox R
GLTR
outlet press
'V42P3064A
RCS L-aft
ox
PRPLT
manf press
m3
06
5~
RCS L-aft
fuel RGLTR
outlet press
V42P3066A
IRCS
L-aft
fuel P
RPLT
Imanf press
1~42~3067~
!RCS L-aft
:ox manf
jtemp
iV42T3068A
iRCSL-aft
/fuel manf
/temp
* u e
P C
Soft limit
High
low
TBD
TBD
TBD
TBD
Hard limit
High
low
300
270
psia
psia
300
270
psia
psia
PITBD
TBD
300
270
psia
psia
300
270
psia
psia
TBD
TBD
P
Correlation
measurement
P3064A
NA
TBD
TBD
TBD
TBD I
P3066A
NA
T3116A
PTBD
TBD
T3118A
-
Operating
functional
patli
RC75
RC75
RC122
RC73
RC75
ORC122
RC72
TBD
TBD
RC74
ORClOO
RC7Z
RC74
ORClOO
0RC122
ORCI,-,O
Justification
Tank o
verpress
leak isolation
Correlation for
P3063A
S t
u
S
-- Tank o
verpress
leak
isolation
Correlation for
P3065A
Heat an
d co
ld
I
soak
Heat an
d cold
soak
a
TABLE 3.-
LEFT
AFT R
CS MEASUREMENTS
FOR FDA -
Continued
* Soft li
mit
U
Measurement
Hard
limit1 Correlation1
Operatingl
It! functional
Justification
measurement
I lel~igh low
TBD
TBD
NA
RC71
Correlation for
T3067A
TBD
TBD
NA
RC70
Correlation for
T3068A
I I
tk temp
I I
V42T3124A
TBD
TBD
NA
ORC142 Temp and
leak
ORC120 monitor
I
lxcs L
-aft
JP[TBD
TBD
thruster ini
TBD
TE
D 1 I
I ORC138 Temp and
leak
9RC116 I mon
itor
~RC
S L-aft
:thruster
ini
I ORC133 Temp and leak
I 0~~111
inonitor
I I iR
CS L-aft
!thruster inj r
NA
I
ORC131 Temp and leak
ORCl09 I mo
nitor
I I
TABLE 3.-
LEFT AFT RCS MEASUREMENTS FOR FDA -
Continued
Measurement
i 42T3132A
L-aft
'thruster inj
/temp No 25
J42T3134P.
rn
RCS L-aft
I thruster inj
N
No 27
Cn
I V42T3136A
RC
S L-aft
thruster inj
* U S
e
Soft limit
High
low
temp No 29
IY42T3138A
RCS L-aft
rP
thruster inj
RCS L-aft
thruster inj rP
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
Hard limit
High
low
rP
rP
=P
TBD
TBD
TBD
TBD
TBD
TBD
NA
NA
N A
TBD
TBD
TBD
TBD
TbO
TBD
Correlation
measurement
NA
NA
NA
ORC119
ORC132
ORCllO
ORC134
ORC112
ORC140
ORC118
monitor
Temp and leak
monitor
Temp 2nd
leak
monitor
Temp and
leak
monitor
rs
t a u
S
ORC130
ORC108
OKC139
ORC117
ORC141
Operating
functional
path
I
Justification
Temp and leak
monitor
Temp a.ld
leak
monitor
Temp and leak
I
TA
BL
E 3.-
LE
FT AFT
RC
S M
EASU
REM
EN'TS
FO
R FDA - C
on
tin
ue
d
mea
sure
men
t p
ath
NA
OR
C13
5 T
emp
and
le
ak
OR
C11
3 m
on
ito
r
NA
OR
C14
3 Temp a
nd
le
ak
So
ft
lim
it
Hig
h
low
1 Mea
sure
men
t I:
Hig
h
low
-
TBD
TBD
thru
ste
r in
TBD
",'D
TB
D
TB
D
TB
D
TBD
TB3
TBD
TBD
TBD
NA
I R
C83
I H
eat
and
c
old
TBD
TBD
/LC
S L
-a
ft
!fuel t
an
k
I NA
TBD
TBD
RC
82
[th
rus
ter
23
1 Y
soa
k
Hea
t an
d
co
ld
soa
k
NA
NA
NA
NA
OR
C14
2 O
RC
12 0
O
R'-1
38
OR
C11
6 O
RC
133
OR
Cll
l
OR
C10
9
Sa
fety
Sa
fety
Sa
fety
OR--
Sa
fety
N N -- -
TA
BL
E
3.-
LE
FT
AF
T R
CS
MEA
SUR
EMEN
TS FOR F
DA
- C
an
tin
ue
d
So
ft
lim
it H
ard
li
mit
-7
Co
rre
lati
on
O
pe
rati
ng
fu
nc
tio
na
l
mea
sure
men
t p
ath
M
easu
rem
ent
Ju
sti
fic
ati
on
Iig
h
low
H
igh
lo
w
I S
afe
ty
Sa
fety
I
N A
NP
. N
A
N A
N
A
OR
n 4 1
OR
C11
9
NA
N
A
NA
N
A
NA
OR
Cll
O
N A
N
A
NA
N
A
NA
54
OR
C11
2
N A
N
A
NA
N
A
I N
A
OR
C11
8
Sa
fety
Sa
fety
Sa
fety
Sa
fety
Sa
fety
Sa
fety
Sa
fety
Sa
fety
TA
BL
E
3.-
L
EFT
AF
T
RC
S MEASli'REMENTS F
OR
FD
A - Continued
m
I
h)
w
C
Measurement
RCS L-aft
fuel
manifold A
RCS L-aft
fuel
manifold B
RTS
L-ai-t
fuel
manifold C
* U e
P
P P
fuel
IP T
BD
T
BD
anifold D
,
CS L-aft
fuel
3 T
BD
T
BD
ox manifold P T
RD
T
BD
TB
D
TB
D
TB
D
TB
D
TB
D
TB
D
Soft limit
High low
TB
D
TB
D
- -
TB
D
TB
D
TB
D
TB
D
NA
NA
NA
N N N N
-
Hard limit
High low
TB
D
TB
D
TB
D
TB
D
TB
D
TB
D
I
-
ORC107
QRClOS
Leak isolation
Leak isolation
ORC125
Correlation
measurement
NA
NA
Leak isolation
r
TBD
T
BD
I A
! T
BD
TBD
- RCS L-aft
ox
manifold
ORC128
Operating
functional
path
TE
D
TB
D
NA
TB
D
TB
D
P
L-aft
manifold
ORC'
26
N A
P
Leak isolation
Leak isolation
N
Justification
NA
N t a
u S
N N
ORC103
ORC106
Leak isolation
Leak isolztion
ORC104 Leak isolation
TAi3
LE 3.-
LE
FT
AF
T RCS
ME
-GU
RE
ME
NT
S FOR
FDA
-
Continued
measurement
Soft limit
Yig
h
low
Hard limit
High
low
N A
ORC129 Leak isolation
TB
D
TBD
T
BD
T
BD
bx
manifold
IP -
N.4
ORC127 Leak isolation
TB
D
TB
D
lox maifold
(P~
TB
D
TB
D
a I
I !RC~-
a f aft
I i
I -
.;A RC90
Failed manifold
ORC105 monitor
N A
RC95
Failed sauifold
ORC127 monitor
ORC136 Over temperature
HA
I E fu manifol
Isln valve
N A
osition
P
I RCS L-aft
vernier 103
P T
BD
T
BD
temp
RCS L-aft
vernier 105 P
TB
D
TB
D
+.em
pisPL-aft
Ifu tank
X N
A
NA
sov
1
TB
D
TB
D
i ORC128 land leak monitor
ORC137 lover tem~erature
TB
D
TB
D
I N
A
and leak monitor
I I
NA
1
ORClOl Configuration
-
TA
BL
E
5.-
L
EFT
A
FT
RC
S M
EASU
REM
ENTS
FO
I FD
A -
Concluded
I I *
Soft limit Hard limit Correlation
operating(
u I Measurement
functional
Justiflcatiox
e High
low
High
low
measurement
path
futann
1x1
NA
N
A I NA
id
/ N
A
ORC102 ' Co
nfiguration
SOV 2
fib
Ifu
tank
X N
A
NA
N
A
ORC102
Configuration
' so
v 3
-
RC
S L-art
I N
A
I X
NA
NA
N
A
N A
N
A
Configuration
~C
S
L-a
ft
I I
,ox tank
IX nA
I
ORC123 Iconfiguration
I OA
tan
k
N A
N4
I
sov
3
7.0 RCS CROSSFEED OPERATION
"1 Configuration
Additional P ~ e l and oxidizer functional flow paths to
the RCS manifolds are availatie from each tank on rh2 cross- feed I ine.
The crossfeed conflguxation is chown in fiqcres 15
and 16.
7.2 Ope- 2t ional Guidelines
To zvoi i propellant transfer due to aifferential
pre;sure, only m c propellant tank r t a time i s cmmected
to its respective crossfeed line. To insure equal manifold
pressure, the fuel and oxidizer tank connected to their
respective cr(J3cfeed li,te are from the same 5 . asystem.
TLe left and right aft RCS mny be operated simultaneously
t r m the crocsfeLJ linzs.
7.3 Crossfeed C~mponents
Two addi;ional shut-aff valves connect each crossfeed
line tc the aft left and right WiS. These valves are identi-
fied as RC301 through RC308 (see fzgs. 15 ar,, 16).
" 4 Propellant Cperating Functional Paths
for RCS Crossfeed
7.4.1 BCS fuel tanks to crossfeed line. The fuel
operating functional paths from the tanks to the crossfeed
lines are defined as follows:
I Left aEt RCS (ref. section 5.4.1)
Right aft RCS (ref. section 5.4.3)
7.4.2 -- RCS oxidizer tanks to crossfeed 1 ines. 7 The
oxldizer functional rsths from the tanks to the cr~ssfeed
lines are defined as follows:
Left aft RCS (ref. section 5.4.2)
Right aft RCS (ref. section 5.4.4)
7.4.3 Crossfeed from aft right RCS tanks to aft left
RCS manifolds. The operating functional flow paths frcm
the right aft RCS propellant tanks to the left aft RCS mani-
folds are given below (ref. sectioias 7.4.1 and 7.4.2) :
A Fuel Manifold ORC3OZ = (ORC300) (RC304) (RC94)
0 Fuel Manifold ORC303 = (ORC300) (RC304) (RC92)
E Fuel Manifold ORC304 = (ORC300) (RC304) (RC90)
C Fuel Manifold
ORCsOS = (ORC300) (RC302) (RC96)
D Fuel Manifold
ORC306 = (ORC300) (RC302) (RC98)
0 A Oxidizer Manifold ORC307 = (ORC301) (RC3G3) (RC91)
B Oxidizer Manifold
ORC308 = (ORC301) (RC3031 (RC93)
E Oxidizer Manifold ORC309 = (02C301) (RC303) (RC95)
a C Oxidizer Manifold
ORC310 = (ORC301) (RC301) (RC97)
D Oxidizer Manifoid ORC311 = (ORC301) (RC301) (RC99)
7.4.4 Crossfeed from aft left - RCS tanks to aft right
RCS man5ic~lds. The operating fk-ctional flow paths from the -- -7
left aft RCS propellant tanks to the right aft RCS manifolds
are given below (ref. sections 7.4.1 and 7.4.2):
A Fuel Manifold
ORC322 = (ORC320) (RC308) !RC170)
B Fuel Manifold
ORC323 = (ORC320) (RC308j (RC172)
E Fuel Manifold
ORC324 = (ORC320) (~C308) (RC174)
a C Fuel Manifold ORC32S = (ORC32Q) (RC306) (RC176)
D Fuel Manifold ORC326 = (ORC320) (RC306) (RC178)
A Oxidizer Macifald ORC327 = (ORC321) (ORC307) JRC171)
B Oxidizer Manifold ORC328 = (ORC321) (ORC307) (RC173)
E Oxidizer Manifold ORC329 = (OlX321) (ORC307) (RC175)
C Oxidizer Manifold
ORC330 = (ORC321) (ORC30S) (RC177)
D Oxidizer Nanifold ORC331 = (ORC321) (ORC30S) (RC179)
7.5 Measurements
No additional measurements are required for RCS cross-
feed operation.
8 . 0 RCS , OblS IN'I'EKCONNECT OI'liKAl'I(jN
1 I'unct ional Paths for OMSJRCS lntcrconncct
The OMS fgnctional paths used for RCS interconnect are shown in figure 17. T h are identified as OMXX. Functional
paths are combined il,,a operating functional paths and idcnti-
f ic3 3:- 308lY.X.
Y ' :anctional Path Analysis of OMS Propellant
P : t t h to CrossfecJ Lines
C M 1 ,.!ld Obl? are hcliun source tanks. Ilach t-ank 1::rs a
volulnt. ot' 15.4 cubic feet. I'he tanks are pressurized to
3pproxim:l.ely 4000 p s i a prior to launch.
O H 3 through OM6 are helium isolation shut-off valves
in series nith a primary and secondary helium regulator.
rznk Fressure is regulated to approximately 2 1 3 psig.
C0:\17 through W110 are shuL-off valve.; to isolate oxidizer
iron t11,. I ~ c l iur, maniic l d during periods hen tanks arc- not
in use.
W 1 1 , 0>!12, OM15, a d OM16 are series ;.nrallel chcck
valvcs t.o isolate pro:,cl l a n t frqm the he1 iufn innni '-old.
Ob113, Ob114, Ob.117, and O!I18 are manual shut -off valves
used for ground servicing only.
OM19 through OM22 a r e b u r s t d i s c i n s e r i e s w i t h poppet
r e l i e f va lves f o r r e l i e v i n g helium overboard, i n t h e event
a f a i l u r i t r e s u l t s i n over p r e s s u r i z a t i o n o f t h e tank .
OM23 t h r m g h OM26 a r e p r o p e l l a n t hold ing t anks . Each
t ank has 2 volume o f approximately 89.5 c u b i c f e e t .
OM27 t h r o u p OM34 a r e p a i r s of p a r a l l e l redundant s h u t -
o f f va lvzs . E i t h e r va lve i n a p a i r can flow enough p r o p e l l a n t
t o suppor t an OMS engine burn.
OM35 through OM39 and OM41 through Oh44 a r e p a i r s o f
p a r a l l e l redundant s h u t - o f f v a l v e s . These v a l v e s c o ~ n e c t
t h e OMS manifolds t o t h e c r o s s f e e d l i n e s .
8.3 OMS Opera t ing Func t iona l Pa ths t o t h e
Crossfeed Lines
Opera t ing f u n c t i o n a l p a t h s f o r OMS p r o p e l l a n t t o t h e
c r ~ s s f e e d l i n e s a r e d e f i n e d a s fo l lows ( s e e f i g . 1 7 ) :
L e f t pod OMS f u e l t o c r o s s f e e d l i n e
O O M l = (OM1) (OM3 + OMS) (OM15) (OM17) (OM25)
(OM31 + OM33) (OM39 + CM41)
L z f t pod OMS o x i d i z e r t o c r o s s f e e i l i n e
00M2 = (OM1) (OM3 + OMS) (OM7 + OM9) (CM11) (OM13)
(OM23) (OM27 + OM29) (OM35 + OM37)
Right pod OMS f u e l t o c r o s s f e e d l i n e
@OM3 = (OM2) (OM4 + 0M6) (OM161 (OM18) (OM24)
(OM28 + 0i430) (OM42 + OM44)
0 Klght pod OMS oxidizer to crossfield line
00M4 = (OM2) (OM4 + 0M6) (OM8 + OM10) (OM12)
(OM14) (OM26) (OM32 + OM34) (OM36 + OM38)
8.4 Operating Functional Paths for Interconnect
Left OMS to Left RCS Manifclds
The operating functional paths for supplying propellant
from the left pod OMS tanks to the left pod RCS manifolds
are defined as follows (ref. section 8.3) :
Left RCS fuel manifold A
OKC340 = (00M1) (RC304) (RC94)
0 Left RCS fuel manifold B
ORC342 = (00M1) (RC304) (RC92)
0 Left RCS fuel manifold E
ORC344 = (00M1) (RC304) (RC90)
Left RCS fuel manifold C ORC346 = (00M1) (RC302) (RC96)
Loft RCS fuel manifold D ORC348 = (00M1) (RC302) (RC98)
Left RCS oxidizer manifold A
ORC341 = (00M2) (RC303) (RC91)
Left RCS oxidizer manifold B ORC343 = (00M2) (RC303) (RC93)
Left RCS oxidizer manifold E CRC345 = (00P12) (RC303) (RC95j
Left RCS oxidizer manifold C OIiC347 = (00M2) (RC301) (RC97)
Left RCS oxidizer manifold D ORC349 = (00M2) (RC301) (RC99)
. . I A ~ c t 5 . 5 Operating Functional Paths for Intercop- Right OMS to Left RCS Manifolds
The operating functional paths for supplying propellant from the right pod OMS tanks to the left pod RCS manifold are defined as follows (ref. section 8 , , 3 ) :
0 Left RCS fuel manifold A
ORC350 = (OOM3) (RCJ04j (RC94)
Left RCS fuel manifold B O?.C352 = (00M3) (RC304) (RC92)
0 Left RCS fuel manifold E ORC354 = (00M3) (RC304) (RC?O)
Left RCS fuzl manifold C ORC356 = (00M3) (RC302: TRC36)
e Left RCS fuel manifold 3 ORC358 = (00M3) (RC302j (RC98)
r Left RCS oxidizer manifcld A
ORC351 = (00M4) (RC303) (RC91)
0 Left HCS oxidizer manifola B ORC353 = (00M4j (RC303) (RC93)
0 Left RCS oxidizer manifold E ORC355 = (OMM4) (RC303) (RC95)
r Left RCS oxidizer nix:~ifoJd C ORC357 = (OMM4) (RC3C1) (RC97)
Left RCS oxidize1 manifold D ORC359 = (OMM4) (RC301) (RC99)
8.6 Operating Functional Paths for Interconnect,
Lert OMS to Right RCS Manifolds
The operating functional paths for supplying propellant
from the left OMS pod to the right RCS manifolds are defined
as follows (ref. section 8.3) :
Righ: RCS fuel manifold A
ORC3bC = (00M1) (RC308) (RC170)
a Right RCS fuel manifold B ORC362 = (00M1) (RC308) (RC172)
a Right KCS fuel manifold E ORC364 = (00M1) (RC308) (RC174)
a Xight RCS fuel manifold C
ORCZ66 = (00M1) (KC306) (RC176)
Right ACS fuel manifold D ORC368 = (00MI) (2C305) (RC178)
Right RCS oxidizer manifold A
OKC361 = (00M2) (RC307) (RCl?l j
a Right RCS oxidizer manifold 9
3RC363 = (00M2) jRC307) (RC173'
o Right RCS oxidizer manifold E
ORC365 = (00b12) (RCj07) (RC17qj
0 Right RCS oxidizer manifold C
ORC367 = (00M2) (RC305) (RC177)
a Right RCS oxidizer manifold D ORC369 = (00M2) (RC305) (RC179)
8.7 Operating Functioaal Fath': for Interca .nett Right OMS to Right RCS Manifvlds
The operating functional pa,+s for supplying propellant from the right OMS p c J to tht r i g h t RCS manifolds are defined
as follows (ref. sect ion 8.3; .
Right RCS fuel 'nanifold ' ORC370 = (00M3) (k;ZnQ, (RC170)
a Right RCS fuel manifold B ORC372 = (00M3) (RC308) (RC172)
Right RCS fuel manifold E ORC374 = (00M3) (RC308) (RC154)
s Rigt.. RCS' fuel manifold C bKZ75 = (00Y3) (RC306) (1X176)
o Right RCS fuel manifold D CRC378 = (00M3) (RC306) (AC178)
a Right RCS oxidizer manifold A
ORCj71 = (00M4) (RC307) (RC171)
Right RCS oxidizor manifold B ORC373 = (00M4) (P.C307) (RC173)
0 Right RCS oxidizer manifold E
ORC375 = (DOM4) (RC307) (RC175)
a Right RCS oxidizer manifold C ORC377 = /00M4) (RC305) (RC177)
Right RCS oxidizer manStsld D ORC379 = (00M4) (RC305) (RC179)
8.8 Crosqfced S i n g l e P o i n t F a i l u r e
During OMS burns when t h e OMS e n g i n e s ..re be ing s u p p l i e d p r o p e l l a n t (from tne cc rgo bay k i t ) th rough t h e c r o s s f e e d
l i n e s , t h e RCS c r o s s f e e d v a l v e s sre a s s n g l e p o i n t f a i l u r e .
I < an RCS c r a s s f e e d v a l v e f a i l s open, t h e OMS e n g i n e w i l l b e s u p p l i e d from t h e KCS t a n k , s i n c e i t i s a t a h i g h e r p r e s s u r e
t h a n t h e ca rgo bay k j t . I n a d d i t i o n t o d e q l e t i n g t h e RCS
p r o p e l l a n t , t h e OMS i n l e t de,,a p r e s s u r e 1'-111it w i l l be
exceeded.
A s t u d y i s p r e s e n t l y be,ng cofiducted t o de te rmine i f
t h i s prcblem can be r e s o l v e d by changing t h e RCS and CMS
u l l a g e p r e s s u r e .
The measurements r e q u i r e d f o r fsult d e t e c t i o n arid annun-
c i a t i o n f o r OMSIRCS interconnect o p e r a t i o n a r e e i v e n i n
t a b l e s 4 and 5.
S i x new measuremzrits ha-re been i d e n t i f i e d t o be added
t o t h e Master Measiiremen:~ L i t t .
Four new measurements a r e r e q u i r e d f o r n o n i t o r i n g v a l v e
p o s i t i o n of nzw t a n k SOVas t h a t were added t o t h e syscem.
I n a d d i t i o n , r e d w d a n t he l ium soGrce p r e s s u r e t r a n s d u c e r s
should be added. Systsm -+. , - tus i s l o s t i f he l ium s o u r c e
p r e s s u r e cannot be determined.
U l i 0
5. 0 I z 0 r= N -4 1 +
E 4 I 1 - -- r:
0 x *, -4 4 " E
3 U a i. C 'I. a 0 0 > y 1 2
OMS-L Eng He
NA
NA
NA
NA
OOMl
Ve
rify
fl
ow pat
h fu
el is
ln
00M2
OMS-L vapor
NA
NA
NA
NA
OM7
Veri
fy fl
ow pkt
t isln valvc.
00M2
1 os
itio
n
OMS-L vapor
'"ll'sE is
ln valve
! i.A
i..
1 NA
17
0'
9
veri
fy fl
ow patl
2 po
siti
on
00M2
TAULE 4:-
LEI:'13 OM
S ME
ASUR
LMEN
TS
FOR
FD
A DU
RING
LE
FT O
MS/RCS
INTE
RCON
NECT
- Con
tinu
ed
S'
t
a
u s
Just
ific
atio
n
Leak mo
nito
r
Syst
em st
atus
le
ak de
tect
ion
Syst
em man
agem
ent
Oper
atin
g fu
ncti
onal
path
0M2'
OOMl
OM 1
00M 1
00M2
OM 1
OOMl
00M2
Corr
elat
ion
meas
urem
ent
'fllOE
Har
d limit
High
low
270
200
Prop
ella
nt
remaining
depe
nden
t
TBD
TBU
k Me
asur
emen
t
I OM3
107s
fuel
tank
?I T
DU TBD
Eng
He P
TBD TB
D
ress
ure 05A
P TBD TBD
He
tan
k
U ,
e Soft limit
High
low
TABLE
5.-
R
IGIi
T
OMS MEASUREMENTS FOR
FDA
DlJ
RIN
G RIGHT OMS/
*P
= Primary
C
= Correlation
X =
Precondition
**N
= Ne
w Measurement Required
Mc surement
V43Q2070A
OMS-R Eng
~Zuel tank
U e P
00
I w
P
3MS-REng
PTBD
TBD
fuel tank
;MS-R
Eng
'Ie P TBU
TBD
ank te
mp
OMS-R Eng
fuel tank
low level
m3~2074~
Eng
fuel tank
Soft limit
High
low
NA
NA
TBD
'TBD
7 0A
270
200
TB
D
TB
D
Ilard
limit
High
low
Mission
dependent
NA
NA
TBD
:'BD
0M24
00M3
OM2
Correlation
measurement
Leak monitor
System management
Operating
functional
path
0°M3
00M3
OM24
--p* - 1
Justification
a
t
Consumables
management leak
detection
Insure no
u
S
propellant
dep ~e t ion
I Sy,:?m
management
TABLE 5.-
RIGHT O
MS M
EASUREMENTS FOR F
DA D
URIN
G R
IGH
T OMS/
RCS
INTERCONNECT - C
on
tin
ued
3MS-R E
ng H
e p
NA
NA
NA
NA
OM4
fue
l is
ln
Ve
rify
fl
ow
pa
th
va
lve
po
siti
on
00M3
NA
NA
NA
Ve
rify
fl
ow
pa
th
NA
NA
NA
OIY
IO
Ve
rify
fl
ow
pa
th
So
ft l
imit
Hig
h lo
w
TB
D
TB
D
Tbn
TBD
Har
d li
mit
Hig
h lo
w
Pro
pe
lla
nt
rem
ain
ing
d
epen
den
t F
rop
ell
an
t re
mai
nin
g
dep
end
ent
. Mea
sure
men
t
OMS-'
En
g H
e ta
nk
p
ress
ure
No
1 M
S-R
E
ng
e ta
nk
30
I p
ress
ure
No
2 I-I ~n
ZllOE
* U e P P
Co
rre
lati
on
mea
sure
men
t
Op
era
tin
g
fun
ctio
:.al
p
eth
OM2
00M
3
00M4
OM Z
00M 3
00M4
-
Ju
sti
fic
ati
on
-
Sy
stem
sv
atu
s le
ak
ch
eck
L
oss
of
F~
oO
wou
ld
res
ult
in
lo
ss
of
sta
tus
- 1 , 1 I 6 I!
TAB
LE
5.-
R
IGH
T
OM
S M
EASU
REM
ENTS
FO
R FD
A
DSX
ING
R
IGH
T
OM
S/
RC
S IN
TER
CO
NN
ECT - C
on
tin
ue
d
So
ft l
im
it
Har
d
J.i:
nit
U
Mea
sure
men
t
e H
igh
lo
w
Hig
h
low
lvli
ssio
n
X ta
nk
o
ep
en
de
nt
MS-R E
ng
p
NA
X
tan
k
I I N
A
I NA
N
A
MS
-R
En
go
XP
TB
D
TBD
ta
nk
nll
ag
e
P I I
res
su
re
Eng
He
N
A
X is
ln v
alv
e
t N
A
NA
N
A
po
sit
ion
I
I I
mea
sure
men
t S
C
on
sum
able
s m
anag
emen
t le
ak
-
0°M
4
de
tec
tio
n
1 In
su
re n
o 00M4
pro
pe
lla
nt
de
ple
tio
n
I I O
M24
ls
yst
em
man
agem
ent I I
OOMS
Ins
ure
pa
th
flo
w
TABLE
5.-
RIGHT OMS MEASUREMEN'fS FOR FDA DURING RIGHT OMS/
RCS INTERCONNECT - Continued
Measurement
6 E
. * U e
oMS-REng
,X
fuel dump
Soft limit
High
low
Hard limit
High
low
NA
NA
NA
N A
S t
u S
00M3
NA
NA
NA
NA
NA
NA
Verify closed
line
-
Justification
I
00M 3
00M4
O9M4
-
Correlation
measurement
OMS-R Eng OX
NA
NA
dump valve
Operating
functional
path
OMS-R Eng OX
isln valve
position
OMS-R Eng OX
isln valve
pcsition
Verify closed
1 ine -.
ify propellant
flow path
Verify propellant
flow p?.th
' I N P
NA
NA
NA
NA
TABLE 5.-
RIGHT OMS MEASUREMENTS FOR FDA DURING RIGHT OMS/
RCS INTERCONNECT - Continued
r
Meas?,rement
b43~2015E
OMS-R Eng
fuel isl?
valve 1
!OMS-R Eng
fuel isln
va;te
2
fl
4
6
En
g fuel XFD
line temp
V43XZ065E
3MS-R Eng
fuel XFD
u e P X
:P
I valve No
1
OMS-R Eng
fuel XFD
va
!ve No
2 gos i tion
I
Correlation
measurement
Operating
functional
path
00M 3
00M 3
00M 3
- --
00M 3
NA
NA 1
Soft ljni~ h'ard 1imj.t
i *
P 00M3
NA
NA
Hig
h
30
hf
NA
NA
NA
NA
TBD
TBD
NA
NA
Insure flow path
Justification
Insure open line
Insure open line
Verify line
condition
Insure flow path
High low
NA
N A
NA
NA
TBD
TBD
NA
NA
sa
t a
t
L S
N b
TABLE 5.-
RIGHT OMS MEASUREMENTS FOR FDA, DURING RIGHT OMS/
RCS INTERCONNECT - Cwcluded
1 1 i , I <
Correlation
measurement
Operating1
Hard limit
High low
TBD TBD
NA
NA
NA
NA
functional
path
00M4
0M32
00M4
0M34
00M4
Soft limit
High
low
TBD TBD
NA
NA
NA
NA
?
Veasurement
2263A
Eng OX
XFD line
OW3-R Eng OX
XFD valve No
1 position
V43X2268E
OMS-R Eng OX
XFD valve No
2 position
Justification
Verify line
condition
Insure flow path
Insure flow path
* U e
X
9 . 0
di tiona
RCS INTERCONNECT TO CARGO BAY AUXILIARY PROPELLANT KIT
1 propellant flow operating functional paths
are available to the RCS manifolds from the cargo tay auxil- iary propellant kits.
The functional paths of the auxiliary propellant from the cargo bay kit to the crossfeed lines are shown in
figure 18. The functional paths are identified as CKXX and Lre combined into operating functional paths identified
as OCKXX.
9.1 Functional Path Analysis of Auxiliary Propellant to Crossfeed Line
The cargo bay kits are added when more OMS delta velocity is required than can be supplied by the dedicated OMS tanks. Each kit consists of a fuel tank, an oxidizer tank, and a helium source bottle. One to three kits may
be added to the cargo bay. The propellant tanks are connected in series, and the helium tanks are added in parallel.
CK1 consists of from one to three helium source bottles connected to a common manifold. Each bottle has a volume
of 15.4 cubic feet.
CK3 is a shut-off valve allowing helium to be loaded from a ground source Juring servicing.
CKZ and CK4 cons i s t of helium i s o l a t i o n valves i n
series with a primary and secondary helium pressure regu-
l a to r . The pr i raxy r egu la to r regula tes t he output t o
218 psig.
CKS cons i s t s of two helium i s o l a t i o n valves i n p a r a l l e l
used f o r p o s i t i v e i s o l a t i o n of N204 from t h e n e l i l n maaifold.
These valves remain c lcsed when the cargo bay k i t s a r e no t
i n use.
CY6 and CK8 a r e s e r i e s p a r a l l e l check odlves which
i s o l a t e p rope l lan ts from the helium manifold.
CY7 and CK9 a r e manual shut-off valves used during
growd serv ic ing only.
C K l B and C K 1 1 cons i s t o i a bu r s t d i s c and poppet r e l i e f
valve, In t he event the tanks a r e subjected t o over pressure ,
the burs t d i s c ruptures and the excess helium vents overboard
through the poppet r e l i e f valve.
C K l Z and CK13 a r e prope l lan t holding tanks, Each tank
has a volume of approximatel;: 8 9 . 5 cubic f e e t . Each k i t
c o n t a i m a f u e l and an ox id izer tank. A maximum of t h ree
k i t s may be i n s t a l l e d i n a vehic le .
CK14 through CK17 a r e s e r i e s p a r a l l e l shut-off valves
TOSS- which i s o l a t e the cargo bay k i t p rope l lan ts from the c*
feed l i nes .
CK18 tl-.rough CK22 a r e bulkhead disconnects and feed-
throughs from the cargo bay t o the a f t fuselage.
9.2 Cargo Eay E i t Opera t ing Func t iona l Pa ths
t o t h e Crossfeed Lines
Opera t ing f u n c t i o n a l p a t h s , f o r a u x i l i z r y p r o p e l l a n t
from t h e cargo bay k i t t o t h e c r o s s f e e d lmes, a r e d e f i n e d
a s f o l l o v s ( s e e f i g . i 8 ) :
Cargo bay a u x i l i a r y f u e l t o c r o s s f e e d l i n e
O C K l = (CEl) (CE2 + CK4) (CE6) (CK7)
(CEl2> (cKl4 + CElSj (CE18)
Cargo bay a u x i l i a r y o x i d i z e r t o c r o s s f e e d l i n e
OCE2 = (CK1) (CK2 + CEJ) (CK5) (CE8)
(CE9) ( C S 1 3 ) (CE16 + CE17) (CK22)
9 .3 Cargo Bay K i t Opera t ing Funct ional Pa ths
t o Aft L e f t RCS Yani fo lds
The f u n c t i o n a l p a t h s of t h e a u x i l i a r y p r o p e l l a n t fro^
t h e cargo bay k i t t o t h e l e f t a f t RCS manifo lds a r e d e f i n e d
a s f o l l o u s ( s e e f i g s , 11 and 12) :
L e f t a f t RCS f u e l manifold A
OCE380 = (OCI1) (RC304) (RC94)
Lef t a f t RCS f u e l manif022 B
OCE382 = (OCKI) (RC304) (RC92)
Lef t a f t RCS f u e l manifold E
OCE384 - (OCEl) (RC3C4) (RC90)
0 Lef t a f t RCS f u e l manifold C
OCE386 = (OCE1) (RC302) (RC96)
Lef t a f t RCS f u e l manifold D
OCE388 = (OCKl) (RC3il2) (RC96)
a Left aft RCS oxidizer manifold A OCK381 = (OCK2) (RC303) (RC91)
Left aft RCS oxidizer manifold B 0CK383 = (OCK2) (RC303) (RC93)
a Left aft RCS oxidizer nanifold E OCK385 = (OCKZ) (RC303) (RC9S)
a Left aft RCS oxidizer nanifoid C
OCK387 = (OCK2) (RC301) (RC97:
a Left aft RCS oxidizer manifold D OCK389 = (OCKZ) (RC301) (RC99)
9.4 Cargo Bay Kit Operating Functional Paths
to Aft Right RCS Manifolds
The functional paths of the auxiliary propellant froni
the cargo bay kit to the right aft RCS manifolds are defined
as follows (see figs. 11 and 12) :
a Right aft RCS fuel manifold A OCK390 = (OCKI) (RC308) (RC170)
a Right aft RCS fuel manifold B
OCK392 = (OCKl) (RC308) (RC172)
a Right aft RCS fuel manifold E OCK394 = (OCKl) (RC308) (RC174)
a Right aft RCS fuel manifold C
OCK396 = (OCKl) (RC306) (RC176)
a Right aft RCS fuel manifold D OCK398 = (OCK1) (RC306) (RC178)
Right aft RCS oxidizer manifold A
OCK391 = (OCKZ) (RC307) (RC171)
Right aft RCS oxidizer manifold B OCK393 = (OCK2) (RC307) (RC173)
Right aft RCS oxidizer manifold E 0C1395 = (OCK2) (RC307) (RC175)
a Right aft RCS oxidizer manifold C
0CE397 = (OCK2) (RC305) (RC177)
Right aft RCS oxidizer manifold D OCE399 = (OCK2) (RC30S) (RC179)
9.5 Measurements
The measurements required for RCS fault detection and
annunciation are listed in table 5 . Five new me*surements
(not in the !.faster Efeasurements List), dated November 16,
1973, are identified.
Since helium pressure provides the best overall system
status as uell as a means of propellant gauging, the measure-
ment should be redundant.
Tank pressures are required for leak isolation and over-
pressure monitoring. At least one pressure transducer
should be added to the fuel and oxidizer tanks.
Position indicators are required to indicate the posi-
tion of the SOV's in functional paths CK14 through CK17.
An indicator should be added to monitor the status of each path or, preferably, the status of each valve.
TA
BL
E 6.-
AUXILIARY PROPELLANT KIT
MEA
SUR
EMEN
TS REQUIRED FOR
Soft li
mit
Measurement
MS vapor
NA
Isln v
alve N
I('
d 1 N
A
I OMS vapor
NA
Isln v
alve N
d I N A
MSOX I
sln
NA
I I
N A
MS oxidizer
aux
RC
S FD
A -
Continued
s' Ilard
limi
t Correlation
Operating
t
functional
Justification
a t High
low
measurement
path
L S
Overpressure
210
260
CK13
monitor leak
h I
I I
1 monitor
I OCK
CK5
Crossfeed
CCK2
configuration
Crossfeed
configuration
I I
I OCK2
I configuration
I I
I I
I OCK2
configuration
I I
TABLE 6.-
AUXILIARY PROPELLANT K
IT M
EASUREMENTS REQUIRED F
OR
RCS FDA - Continued
Measurement
Soft li
mit
Hard li
mit
Correlation
Oper
atin
g functional
High
low
High
low
measurement
path
NA
NA
NA
NA
CK14
OCKl
NA
NA
NA
NA
CK15
OCKl
TBD
TBD 1 TB
D TBD
CK12
1 OCKl
TBD
TBD I TB
D
TBD (
Justification
i Cross
con? fe
ed
guration
Crosafeed
cnsEiguration
Insure n
o
I I
depiarion b
urns
II
Insure n
o
I I depletion b
urns
I I
System m
anagement
System m
anag
emen
t,
TABLE
6.- AUXILIARY
PROPELLANT KIT MEASUREMENTS REQUIRED
FOR
RCS
FDA -
ConcLuded
. Measurement
A
OMS
tan
k^
NO
3 bulk
M"
OMS-OX tank
No 1 bulk
OMS-OX tank
No 2 bulk
temp -
aux
v*~
10
27
6A
OMS-OX tank
No 3 bulk
temp - aux
* e
Soft limit
High
low
TBD
TBD
TBD
TBD
TB,,
TBD
TBD
TBD
Hard
lib
. t
High
low
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
Correlation
measurement
Operating
functional
path
CK12
OCKl
CK13
OCK2
CK13
OCK2
CK13
OCK2
Justification
System management
System manageinent
~ys
tern management
System management
4T CONTRJL SYSTEW/REACTION CONTROL
SYSTEM INTERFACES
The i n t e r f a c e between t h e f l i g h t c o n t r c l system (FCS)
and t h e r e a c t i o n c o n t r o l system (RCS) i s n o t f u l l y def ined. The b a s i c FCS/RCS i n t e r f a c e is shown i n f i g u r e 19.
10.1 I n t e r f a c e Opera t ion
Redundant ON commands from t h e guidance and c o n t r o l
computer a r e rou ted through two f l i g h t c r i t i c a l MDN's t o
t h e r e a c t i o n j e t d r i v e r i n p u t b u f f e r . Loss of e i t h e r ON
command t o t h e i n p u t b u f f e r , o r e i t h e r command f a i l e d on,
r e s u l t s i n an i l l e g a l command s i g n a l t o t h e computer. The
f a i l e d jet i s then removed from t h e jet s e l e c t log ic .
A v a l i d ON command t u r n s on +!-a swi tch ing a m p l i f i e r which a p p l i e s +28 VDC t o t h e ..uzl so leno id va lve c o i l s ,
t h a t open t h e engine i n l e t valve;. The p r o p e l l a n t s then
impinge and i g n i t e i n t h e t h r u s t chamber. As chamber p r e s s u r e
b u i l d s up, t h e chamber p r e s s u r e swi tches c l o s e sending a
s i g n a l back t o t h e monitor t o i n d i c a t e a good f i r e sequence.
10.2 De tec tab le F a i l u r e
F a i l u r e of one of t h e ON commands i n e i t h e r s t a t e r e s u l t s i n an i l l e g a l command s i g n a l t o t h e computer.
A l e g a l ON command wi thout a p r e s s u r e swi tch c l o s u r e r e s u l t s i n a n o - f i r e s i g n a l t o t h e computer. I n e i t h e r c a s e ,
t h e computer removes t h e t h r u s t e r from t h e j e t s e l e c t l o g i c .
DU
AL
Fig
ure
1
9. -
Ba
sic
F
CS
/RC
S
inte
rfa
ce
.
A thrust chamber pressure switch closure without a valid ON command results in a failed on signal. The monitor closes the manifold isolation valves and the computer removes all jets on the manifold froln the jet select logic.
10.3 Undetectable Failures
a~itching amplifier on failures cannot be isolated
except as a failed on jet. This failure presently results : : in the loss of all jets on the manifold. The addition of ?' a switching amplifier output measurement and & circuit
breaker, between the bus line and the amplifier, would allow single jet isolation for a switching amplifier on
failure. Other methods to preclude a pressure switch failure
from failing the whole manifold are being studied.
Failure of a single thruster inlet valve in the open position can only be detected as a leak. Addition of
position indicators on the thruster inlet valves would eliminate this problem. The addition of manifold pressure
measurements downstream of the thruster isolation valves is required, if the leak isolation method is used to isolate
this failure.
11.0 CONCLUSIONS AND RECOMMENDATIONS
11.1 System Definition
The RCS is not fully defined at this time; however, the basic measurement requirements for fault detection and annunciation should be nearly identical to those listed in this d~cument.
11.2 Forward RCS
Twenty-eight new measurements not presently included in the Master Measurement~List, dated November 16, 1973, have been i3ontified as requirements for FDA. These measurements should be added to the Master Measurement List.
The new measurements are identified as follows:
0 Engine burn through monitors 16 ea
0 Manifold pressures 10 ea
a Helium source pressure 2 ea
Due to lack of configuration information on the forward RCS doors, monitoring of the RCS doors has not been considered in this report. D t ~ r monitoring will be required during operational missions.
11.3 Left and Right Aft RCS
Seventy-two new measurements not presently included in the Master Measurement List, dated November 16, 1973, have been identified as requirements for FDA. These measurements should be added to the Master Measurement List.
The new measurements are identified as follows:
r Engine burn through monitors 28 ea
0 Manifold pressures
0 Manifold and tank SOV1s
a Helium source pressures 4 ea
a Engine temperatures 4 ea
11.4 RCS Crossfeed/Interconnect Operation
Eleven new measurements are required for crossfeed
monitoring. They are identified as follows:
r OMS crossfeed SOV position 4 ea
a OMS helium source pressure 2 ea
Auxiliary propellant helium source pressure 1 ea
0 Auxiliary propellant tank pressures 2 ea
0 Auxiliary propellant SOV positions 2 es
The RCS crossfeed valves are single point failures,
w5ich coul2 result in depleting the RCS propellant tank
associated with the failed valve during some OMS engine
burns.
The RCS propellant tanks operate at a higher pressure
than the cargo bay tanks. If the OMS engine is being supplied by the cargo bay propellant tanks, and an RCS cross-
feed valve fails open, ths associated RCS tank will be
depleted. A study is being conducted by Rockwell International
to resolve this problem. Consideration is being given to
equalizing OM: and RCS ullage pressures.
11.5 FCS/RCS Interface
Consideration should be given to the following in the
design of the reaction jet drivers.
As a minimum, the reaction jet drivers should provide
the following:
0 Redundant chamber pressure sensors.
0 Jet driver output monitors.
rn Jet driver electrical-ON failure isolation capabi li +y .
0 Single jet driver power isolation capability.
3 Failure identification annunciation.
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