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7/27/2019 Hydraulic Ata Ch 24
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Hydraulic Power Basics
Hydraulic fluid
Components
System type
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Hydraulic Power Basics
Hydraulic fluid
Low freezing point
minimum viscosity change withtemperature variations
good lubrication quality
high flash point anti-corrosive quality
minimum effect on rubber based seals and
lines
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Hydraulic Power Basics
Hydraulic fluidTYPE DYED
COLORSEALS & HOSES USAGE
VEGETABLE NO PURE RUBER Light A/C brake
MINERAL RED NOT NATURE
RUBBER
BRAKE, HYD,
LANDING GEAR
SYNTHETIC GREEN,PURPLE,
AMBER
BUTYL-RUBBER,
ETHYLENE,
PROPYLENE,TEFLON
LARGE A/C
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Hydraulic Power Basics
Components
Pump
Pipe-line , Hoses Reservoir
Accumulator
Motor Valve
Actuator
Filter
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Hydraulic Pipeline
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Hydraulic Reservoir
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Hydraulic Motor
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Hydraulic Power Basics
System type - Open vs Close
http://www.engineersedge.com/hydraulic/open_center_system.htmhttp://www.engineersedge.com/hydraulic/fixed_displacment_closed_center_system.htmhttp://www.engineersedge.com/hydraulic/fixed_displacment_closed_center_system.htmhttp://www.engineersedge.com/hydraulic/open_center_system.htm7/27/2019 Hydraulic Ata Ch 24
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ATA 29 Hydraulic Power
GeneralThe hydraulic power is used to operate high power
demand services :
Flight controls ATA 27
Landing gear and braking system ATA 32 Cargo compartment doors ATA 52
Electrical Power (CSM/G) ATA 24
Thrust reversers ATA 78
The system is consists of :
MAIN HYDRAULIC SYSTEMS (29-10)
AUXILIARY HYDRAULIC SYSTEMS (29-20)
HYDRAULIC INDICATING SYSTEM (29-30)
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ATA 29 Hydraulic Power
29-10 MAIN HYDRAULIC SYSTEMS The main hydraulic power systems are those which
supply the high power consumers of the aircraft with
hydraulic power. The aircraft has multiple main
independent hydraulic systems.
The systems are hydraulically isolated from each other.
It is not possible for hydraulic fluid to go from one
system to any other system.
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ATA 29 Hydraulic Power
29-10 MAIN HYDRAULIC SYSTEMS Each system includes:
A reservoir to supply the hydraulic fluid to the pump and to
collect fluid from the return line.
Hydraulic reservoir pressurization system. The aircraft has a
pressurization system for the hydraulic reservoirs. Eachreservoir gets pressurized air to 45~65 psia(usual operation in
flight or on ground), which prevents cavitation of the pumps,
maintains normal return pressure in the hydraulic system, and
also helps to prevent foaming in the reservoirs. The system
also remains airtight in the event of failure of the pressurizationsystem or after an engine shutdown.
One (or two) engine pump(s) directly connected through the
accessory gearbox.
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ATA 29 Hydraulic Power
29-10 MAIN HYDRAULIC SYSTEMS Each system includes(cont) :
The engine pump pressurizes automatically the hydraulic
system in a few seconds at a nominal pressure of 3000 PSI
(206 bars) when the relevant engine operates.
A fire shut off valve installed on the suction line of each enginepump and which isolates the pump from the reservoir in case of
fire or suction line rupture, or engine burst failure affecting at
least two hydraulic systems.
A HP manifold which directs pressure to all the user systems
and on which are installed: pressure switches
a pressure transducer
a relief valve
a leakage measurement solenoid valve.
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ATA 29 Hydraulic Power
29-10 MAIN HYDRAULIC SYSTEMS Each system includes(cont) :
A ground service manifold to isolate on ground each section of
the system for the internal leakage measurement.
A system accumulator to damp pressure surges and
compensate pump response time in the event of high outputdemand.
Valves (check valves - priority valves, pressure-relief valves,
selector valves) which govern the possibility, direction or
priority of fluid flow.
Filters, which maintain cleanliness of the fluid.
Return manifolds.
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ATA 29 Hydraulic Power
29-10 MAIN HYDRAULIC SYSTEMS Each system includes(cont) :
It is also possible to pressurize each main system with one or
more of the auxiliary systems if the main pumps cannot be
used or if for maintenance, a ground power cart is not available.
For maintenance all the systems can also be pressurized froma ground power cart. Connectors are installed on the ground
service panels of the systems.
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ATA 29 Hydraulic Power
29-20 AUXILIARY HYDRAULIC SYSTEMS The auxiliary hydraulic systems supply alternative
pressure sources to hydraulic systems in case of total
engine failure.
These are the auxiliary hydraulic systems: Electric hydraulic pump.
Hydraulic power transfer unit (PTU).
Ram Air Turbine(RAT).
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ATA 29 Hydraulic Power
RAT
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ATA 29 Hydraulic Power
29-30 HYDRAULIC INDICATIONSYSTEMS
The hydraulic systems have sensors which monitor the
condition of the systems. The sensors monitor:
the contents of the hydraulic fluid in the reservoirs
the pressure of the hydraulic fluid in the systems
the output pressure of the pumps
the temperature of the hydraulic fluid (reservoir, electrical pump)
the internal pressure of the reservoir
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