October 6, 2003

TO: Recipients of 250–C30, –C40, and –C47 Series Commercial EngineBulletins

SUBJECT: ENGINE, TURBINE ASSEMBLY – INSPECTION OF 4TH–STAGETURBINE WHEELS (23066744).

This letter transmits Revision 1 to the subject commercial engine bulletins:Model Bulletin Number

250–C30 Series CEB A–72–3266250–C40 Series CEB A–72–5043250–C47 Series CEB A–72–6048

This is a complete revision. Replace the original issue with this Revision 1.

Revision 1 corrects serial numbers and editorial errors.

If you have complied with the previous issue of this bulletin, no additional work is required.

The following list includes the original issue date and all revisions to this bulletin:

Original issue October 2, 2003Revision 1 October 6, 2003

CUSTOMER SUPPORTROLLS–ROYCE

Rolls-Royce CorporationP.O. BOX 420Indianapolis, IN 46216 USAPhone: 317–230–6400Fax: 317–230–6084

CHECK THAT ALL PREVIOUS TRANSMITTALS HAVE BEEN INCORPORATED– if any have not been received please contact Aviall, Inc.via E–mail: 250pubs@aviall.com, Website: www.aviall.com, Phone: 1–800–AVIALL–1 (North America), 1–972–586–1985 (International).

P U B L I C A T I O N T R A N S M I T T A L

ALERT

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

ENGINE, TURBINE ASSEMBLY – INSPECTION OF 4TH–STAGETURBINE WHEELS (23066744)

1. PLANNING INFORMATION

A. Effectivity

(1) Engines

All Rolls-Royce Model 250–C30, –C40 and –C47 series engines are affected by thisbulletin.

(2) Spares – Affected

B. Reason

Recently, an incident was experienced in which a 4th–stage turbine wheel (23066744) wasfound to have an over blended, thin trailing edge. Although blending is a common procedure forturbine wheels, in this particular case the turbine wheel blade trailing edge was blended beyondprint requirements. All Rolls-Royce Model 250–C30, –C40 and –C47 series 4th–stage turbinewheels (23066744), S/N X504345 and earlier require a one-time inspection to verify that theblades do not have a thin trailing edge. A specific lot of wheels also require that this inspectionbe done within the next 300 hours.

C. Description

This commercial engine bulletin gives you the instructions to do an inspection on all 4th–stageturbine wheels (23066744) for a thin trailing edge condition.

D. Approval

Technical aspects are FAA approved.

E. Compliance

For 4th–stage turbine wheels (23066744, S/N HX76702 to HX76755):Compliance Code 2. Turbine wheels which have over 1000 hours must be inspected within thenext 150 hours. Turbine wheels which have less than 1000 hours must be inspected within thenext 300 hours or at 1000 hours, whichever comes first.

For 4th–stage turbine wheels (23066744, S/N X504345 and lower):Compliance Code 4. To be complied with the next time the affected wheel (23066744) is at anauthorized repair/overhaul facility and is disassembled for any reason.

F. Interchangeability – Not affected

G. Material Availability

NEW P/N NAME QTY/ENG

23066744 4th–Stage Turbine Wheel 1

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

H. Tooling – 0.010 inch (0.25 mm) Inspection Tool, “No–Go” Gage

(1) Option 1, assemble a 0.010 inch (0.25 mm) Inspection Tool.

Use two 1/8 inch (3.16 mm) radius post gage blocks with a nut and screw to clamp twopieces of 0.010 inch (0.25 mm) thick shim stock or feeler gage as shown in figures. Aspacer gage block may be used in addition if desired. Position the post gage blocks suchthat a 0.010 inch (0.25 mm) gap exists between the inspection ends (Ref. Fig. 1, 2, and 3).

(2) Option 2, manufacture a 0.010 inch (0.25 mm) inspection tool

Repair/overhaul facilities can manufacture an inspection tool similar to the Rolls-Royceexample provided the gap is not less than 0.010 inch (0.25 mm) and the tool is smallenough to access the trailing edges of the wheel.

I. Weight and Balance – Not affected

J. Electrical Load Data – Not affected

K. References

(1) Advance Engineering Memorandum (AEM), CW112501.

NOTE: The document above is referenced for the internal use of Rolls-Royce only.

(2) 14W2 Operation and Maintenance Manual, Turboshaft Models 250–C30, –C30S, –C30G,–C30G/2, –C30P, –C30M (OMM).

(3) 14W3 Overhaul Manual, Turboshaft Models 250–C30, –C30P, –C30M, –C30S, –C30G,–C30G/2, –C30U (O/H).

(4) 14W4 Illustrated Parts Catalog, Turboshaft Models 250–C30, –C30P, –C30M, –C30S,–C30G, –C30G/2 (IPC).

(5) 14W4R, U Illustrated Parts Catalog, Turboshaft Models 250–C30R, –C30U (IPC).

(6) 14W2RU Operation and Maintenance Manual, Turboshaft Models 250–C30R, –C30U(OMM).

(7) CSP 21003 Operation and Maintenance Manual, Turboshaft Model 250–C30R/3 (OMM).

(8) CSP 23003 Illustrated Parts Catalog, Turboshaft Models 250–C30R/3, –C30R/3M (IPC).

(9) CSP 21006 Operation and Maintenance Manual, Turboshaft Model 250–C30R/3M (OMM).

(10) CSP 21000 Operation and Maintenance Manual, Turboshaft Model 250–C40B (OMM).

(11) CSP 21001 Operation and Maintenance Manual, Turboshaft Model 250–C47B (OMM).

(12) CSP 23001 Illustrated Parts Catalog, Turboshaft Models 250–C40B, –C47B, –C47M (IPC).

(13) CSP 21004 Operation and Maintenance Manual, Turboshaft Model 250–C47M (OMM).

(14) CSP 22001 Overhaul Manual, Turboshaft Models 250–C40B, –C47, –C30R/3, (O/H).

L. Other Publications Affected – None

M. Prerequisites – None

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

2. ACCOMPLISHMENT INSTRUCTIONS

A. Option 1, do an inspection with wheel installed on engine.

(1) Get access to the 4th–stage turbine wheel through the exhaust collector.

(2) Do an inspection on the wheel using the “No Go” gage.

(a) Carefully put the small end of the “No Go” gage next to the trailing edge of a blade.

(b) Carefully check each blade trailing edge thickness with the small end of the “No Go”gage.

(c) Check the entire length of the blade trailing edge from the shroud to the rim.

NOTE: Do not slide the “No Go” gage down the edge of the blade.

(d) If the trailing edge of the blade does not fit into the gap of the “No Go” gage, the bladepasses this inspection (Ref. Fig. 4).

(e) If the trailing edge of the blade fits into the gap of the “No Go” gage, the blade doesnot pass this inspection (Ref. Fig. 5).

(f) Doing a visual inspection and/or using your finger tips to feel the trailing edges of theblades can help to detect thin trailing edges.

NOTE: After checking a number of blades with the “No Go” gage in this manner, theinspector can check 100% of the blade trailing edges visually and samplechecking some of the blades on each wheel with the “No Go” gage. Aftervisual inspection, any blades that appear to be too thin can be checked withthe “No Go” gage.

(g) After inspection of the wheel, please fill out page 10 of this CEB and return toRolls-Royce. The document is to be filled out for all affected wheels, pass or fail.

(3) Any engine or turbine with a 4th–stage turbine wheel that fails the above inspection mustbe sent to an authorized repair/overhaul facility for replacement of the wheel (O/H).

(a) Remove the engine or turbine (Ref. OMM).

(b) Send the engine or turbine to an authorized repair/overhaul facility.

(c) Install the engine or turbine (Ref. OMM).

B. Option 2, remove engine or turbine for inspection at an authorized repair/overhaul facility.

(1) Remove the engine or turbine (Ref. OMM).

(2) Send the engine or turbine to an authorized repair/overhaul facility. The facility must beinstructed to do an inspection of the 4th–stage wheel as outlined in 2.A. Option 1. If anywheel fails the inspection, the 4th–stage wheel is to be replaced (Ref. O/H).

(3) Install the engine or turbine (Ref. OMM).

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

Inspection ToolFIG. 1

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

Inspection ToolFIG. 2

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

Inspection ToolFIG. 3

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

Inspection ToolFIG. 4

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

Inspection ToolFIG. 5

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

C. Record compliance with this commercial engine bulletin in the applicable section of the enginelogbook, turbine assembly (pink pages), Part III, AD Note Compliance and CEB ModificationRecord as applicable with the following:

250–C30 Series CEB A–72–3266250–C40 Series CEB A–72–5043250–C47 Series CEB A–72–6048

D. Basis for quantities is per turbine assembly.

3. MATERIAL INFORMATION

A. Configuration Chart

NEW P/NQTY/ENG NAME OLD P/N

QTY/ENG

INSTRUCTIONS/DISPOSITION

23066744 1 Wheel, Turbine, 4th–Stage

23066744 1 1,2

INSTRUCTIONS/DISPOSITION NOTES

1. New or time continued item.

2. Scrap rejected wheel.

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October 1, 2003Revision 1October 6, 2003

250–C30 Series CEB–A–72–3266250–C40 Series CEB–A–72–5043250–C47 Series CEB–A–72–6048

CEB–A–72–3266 Reporting FormCEB–A–72–5043 Reporting FormCEB–A–72–6048 Reporting Form

Instructions: If you have an affected wheel, please fill out the requested information listedbelow. Make a copy of this page to fax or fax this page to Model 250 CustomerSupport at 1–317–230–3381.

Operator: __________________________________________________________________

Contact: _____________________________________ Ph No:______________________

Fax No.: _____________________________________ E–mail______________________

Turbine Wheel S/N:______________________________ Engine S/N:____________________

Turbine Wheel TIS:______________________________ Cycles:________________________

Inspection Results: Pass Fail

ATT: MODEL 250 CUSTOMER SUPPORT1–317–230–3381

Date Received_______________

(For Rolls–Royce Model 250 CS office use)