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July 25, 2013

Page 1 of 3

AE 2100D2--A--72--085

E COPYRIGHT 2013 Rolls--Royce Corporation (unpublished)

ENGINE -- 1ST--STAGE GAS--GENERATOR TURBINE WHEELS WITH

POSSIBLE BORE PITTING -- LIFE LIMIT DECREASE

1. PLANNING INFORMATION

A. Effectivity

(1) Engines

AE 2100D2 and AE 2100D2A engines with 1st--stage gas--generator turbine wheel

(23079946, 23088906 or 23089692).

(2) Spares -- Not affected

B. Reason

Fluorescent penetrant inspection results show higher than normal pitting in the bore of the

1st--stage gas--generator turbine wheel. Investigation shows that the cleaning process of

wheels during 2007 thru 2010 can be the cause of pitting. As a result, the declared life limit

(engine cycles) of the affected wheels will decrease.

This service bulletin is associated with a pending FAA Airworthiness Directive (AD) that will

mandate a decreased life limit for the 1st--stage gas--generator turbine wheels with possible

pitting.

C. Description

The declared life limit for the 1st--stage gas--generator turbine wheels (23079946, 23088906

and 23089692) (Ref. TASK 05--12--52--800--801, MM) has been decreased. Chapter 5 of the

Maintenance Manual will be revised to show the declared life limit change.

This service bulletin releases a part that is life--limited. It is mandatory that this part be replaced

when the operating time has expired. The operator must record both hours and cycles of

engine use in the applicable section of the life limited parts record of the engine logbook.

The declared life limit for life--limited components located in the upper right corner of the engine

logbook has been deleted. Always refer to TASK 05--10--00--800--801 in the Maintenance

Manual for current engine cycle life limit information.

You must include this mandatory limit in your own approved maintenance schedule, if

applicable.

SERVICE

BULLETIN

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Page 2 of 3

AE 2100D2--A--72--085

E COPYRIGHT 2013 Rolls--Royce Corporation (unpublished)

TABLE 1 -- 1st--stage Gas--generator Turbine Wheel Life Limits

PART

NUMBER

PART NAME OLD DECLARED

LIFE LIMIT

(ENGINE CYCLES)

NEW DECLARED

LIFE LIMIT

(ENGINE CYCLES)

23079946 Wheel, Turbine -- Stage 1 20,000 20,000

(13,700 NOTE 1)

23088906 Wheel, Turbine -- Stage 1 20,000 20,000

(13,700 NOTE 2)

23089692 Wheel, Turbine -- Stage 1 20,000 20,000

(13,700 NOTE 2)

NOTE: (1) Accumulated Cycle Life Limit only for 1st--stage gas--generator turbine wheels

on engines that have complied with Service Bulletin AE 2100D2--72--077 and

have serial number listed in TABLE 2.

NOTE: (2) Accumulated Cycle Life Limit only for 1st--stage gas--generator turbine wheels

on engines that have complied with Service Bulletin AE 2100D2--72--077 and

have serial number listed in TABLE 3.

TABLE 2 -- 1st--stage Gas--generator Turbine Wheel (23079946) with Possible Bore Pitting

AFFECTED SERIAL NUMBER

MW51830

MW51853

MW51864

MW51869

MW51878 thru MW51889

MW51891 thru MW51897

MW51899

MW51900

MW51902 thru MW51904

MW51906

MW51910

MW51914

MW51918 thru MW54698

MW54700 thru MW54720

MW54722 thru MW55911

MW55913

MW55914

MW55916 thru MW55920

MW55922 thru MW55925

MW55927 thru MW61890

TABLE 3 -- 1st--stage Gas--generator Turbine Wheel (23088906 and 23089692) with Possible

Bore Pitting

AFFECTED SERIAL NUMBER

MW61743 thru MW61762

MW61765 thru MW61990

MW61993 thru MW62016

MW62018 thru MW62024

MW62026 thru MW62029

MW62031 thru MW62036

MW62040 thru MW62057

MW62059 thru MW62081

MW62085

MW62088

MW62090

MW62092

MW62094 thru MW62098

MW65529

MW65605

MW65645

MW65659
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AE 2100D2--A--72--085

E COPYRIGHT 2013 Rolls--Royce Corporation (unpublished)

D. Approval

Technical aspects are FAA approved.

E. Manpower

In Service Not applicable.

Engine Removed Not applicable.

F. Compliance

Mandatory.

G. Interchangeability -- Not affected

H. Material Availability -- Not applicable

I. Tooling -- Not applicable

J. Weight and Balance -- Not affected

K. Electrical Load Data -- Not affected

L. References

(1) Advance Engineering Memorandum (AEM), CY500016456038.

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

(2) AE 2100D2 Series Maintenance Manual (MM), CSP34081.

(3) Service Bulletin AE 2100D2--72--077, Engine -- New Gas Generator Turbine (Block--3)

Upgrade

M. Prerequisites -- None

N. Corequisites -- None

2. ACCOMPLISHMENT INSTRUCTIONS

None.

3. MATERIAL INFORMATION

A. Configuration Chart -- Not applicable

B. Consumable Materials -- None

C. Expendable Parts -- None

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ROLLS-ROYCE