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Rolls-Royce Corporation 450 South Meridian Street Indianapolis, IN 46225-1103 Phone: 317-230-3774

USA

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PUBLICATION T~ANSMITTAL

May19,2014

TO: Recipients of M250®-C20, C20B and C20R/2 Commercial Engine Bulletin

SUBJECT: ENGINE, TURBINE SECTION - INSPECTION OF ROLLS-ROYCE M250-C20, C20B, OR C20R/2 3RD-STAGE (23065818) AND 4TH-STAGE (23055944) ENHANCED POWER TURBINE WHEELS

This letter transmits Revision 3 to the subject commercial engine bulletins: Model Bulletin Number

M250-C20, C20B Series M250-C20R/2 Series

CEB-A-1407 CEB-A-72-4098

( This is a complete revision. Replace the Revision 2 issue with this Revision 3.

(__,

Revision 3 changes the Planning Information, the Compliance Code and Accomplishment Instructions sections.

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

Original issue Revision 1 Revision 2 Revision 3

November 29, 201 0 February 7, 2011 August 20, 2012 May 19, 2014

CUSTOMER SUPPORT ROLLS-ROYCE

CHECK THAT ALL PREVIOUS TRANSMITTALS HAVE BEEN INCORPORATED- if any have not been received please contact Aviall; Inc. via E-mail: [email protected], Website: www.availl.com, Phone: 1-800-AVIALL-1 (North America), 1-972-406-2310 (International).

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ALERT COMMERCIAL ENGINE Rolls-Royce

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BULLETIN

ENGINE, TURBINE SECTION - INSPECTION OF ROLLS-ROYCE M250©-C20, C20B, OR C20R/2 3RD-STAGE (23065818) AND

4TH-STAGE (23055944) ENHANCED POWER TURBINE WHEELS

1. PLANNING INFORMATION

A. Effectivity

(1) Engines

All Rolls-Royce M250® -C20, C20B, or C20R/2 engines or turbines fitted with the Enhanced Power Turbine, or 3rd-stage turbine wheel (23065818) or 4th-stage turbine wheel (23055944) that is installed and operated in, or has ever been installed or operated in a M250-C20, C20B, or C20R/2 engine installed in an MD 69HE, 369HS, 369HM, 369D, 369E, or 500N aircraft.

(2) Spares - Not affected

B. Reason

The cause of recent incidents is failure of the 3rd-stage turbine wheel (23065818) or 4th-stage turbine wheel (23055944). Testing and analysis shows operation in the N2 speed avoidance range to be the most possible cause. Refer to the most current revision of CEB A-1400 (CEB A,.. 72-4095) for the speed avoidance range. CEB A-1400 (CEB A-72-4095) caused changes in the applicable MD Helicopters Rotorcraft Flight Manual for Model 369 (50d) and SOON (520N) aircraft. Inspection of some 3rd-stage and 4th-stage turbine wheels installed in Rolls-Royce Model M250-C20, C20B, or C20R/2 engines (installed in MD 369 (500) and 500N (520N) aircraft) is necessary. The inspection includes a visual and Non-Destructive Test (NDT) inspection for cracks in all of the turbine blades.

C. Description

This commercial engine bulletin gives you the procedure to do a visual inspection and NDT inspection of all applicable 3rd-stage and 4th-stage turbine wheels for cracks in the turbine blades.

This Alert CEB is referenced in FAA Airworthiness Directive 2012-14-06.

D. Approval

Technical aspects are FAA approved.

E. Compliance

Compliance Code 2.

(1) To be complied with at each 1750 hour gas producer turbine wheel replacement.

Compliance Code 4.

(2) To be complied with any time the turbine module is at an authorized repair/overhaul facility and is disassembled for any reason.

F. Interchangeability - Not affected

November 29, 2010 Revision 3 May19,2014

M250-C20, C20B CEB-A-1407 M250-C20R/2 CEB-A-72-4098

©201 0, 2014 Rolls-Royce Corporation Page 1 of 5

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G. Material Availability

NEW P/N

23065818

23055944

ALERT Rolls-Royce

COMMERCIAL ENGINE BULLETIN

NAME

Turbine Wheel, 3rd-Stage

Turbine Wheel, 4th-Stage

H. Tooling - Not applicable

I. Weight and Balance - Not affected

J. Electrical Load Data - Not affected

K. References

QTY/ENG

1

1

(1) 10W2 Operation and Maintenance Manual, Turboshaft M250-:C20 (OMM).

(2) CSP 21007 Operation and Maintenance Manual, Turboshaft M250-C20R (OMM).

(3) 10W4 Illustrated Parts Catalog, Turboshaft M250-C20 (IPC).

(4) CSP 23007 Illustrated Parts Catalog, Turboshaft M250-C20R (IPC).

(5) 10W3 Overhaul Manual, Turboshaft M250-C20 (0/H).

(6) GTP 5232-3 Overhaul Manual, Turboshaft M250-C20A (0/H).

L. Other Publications Affected - None

M. Prerequisites - None

2. ACCOMPLISHMENT INSTRUCTIONS

A. Identification .Qf Wheel.

(1) The part numbers of the 3rd'""stage and 4th-stage wheels are recorded in the engine logbook, I Turbine Assembly, Assembly Record, part V.

B. Remove the engine or turbine module and send to an authorized repair/overhaul facility (Ref. OMM).

REF. FIG.1

(1) Remove the 3rd-stage turbine wheel (23065818) and 4th-stage turbine wheel (23055944) (Ref. 0/H).

(a) Do a fluorescent penetrant inspection and visual inspection (for cracks, nicks, etc.) (Ref. 0/H). Monitor the trailing edge of the airfoil near the rim where the fillet engages the trailing edge on the blades as specified in Fig. 1 .

(2) Install new or inspected 3rd-stage turbine wheel (23065818) and 4th-stage turbine wheel (23055944) (Ref. 0/H).

C. Install the engine or the turbine (Ref. QMM).

November 29, 2010 Revision 3 May 19, 2014

M250-C20,C20B CEB-A-1407 M250-C20R/2 CEB-A-72-4098

©201 (), 2014 Rolls-Royce Corporation Page 2 of 5

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November 29, 2010 Revision 3 May 19, 2014

ALERT Rolls-Royce


BLADE TRAILING EDGE

SECTION A-A

3rd and 4th Stage Turbine Wheel Inspection FIG.1

AEG064AA


©2010, 2014 Rolls-Royce Corporation Page 3 of 5

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ALERT Rolls•Royce


D. Notify R. olls-R. oyce of the results of all accepted or rejected wheels per this inspection by email to r· .. [email protected] as follows:

Operator Part Number

1\

November 29, 201 0 Revision 3 May 19, 2014

Power Turbine Wheel

TSN CSN FPI Results (check one)

Time Since Cycles Since Serial Number Last Last Acceptable Rejectc:tble Inspection Inspection

(if applicable) (if applicable) .•

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· .. ~· ···.·\· I

M250-C20, C20B CEB-A-1407 M250-C20R/2 CEB-A-72-4098 (_,

©2010, 2014 Rolls-Royce Corporation Page 4 of 5

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E. Record compliance with this commercial engine bulletin in the applicable section of the engine logbook, turbine assembly, AD Note Compliance and CEB Modification Record, Part Ill, and the component record card for the turbine wheels as applicable with the following:

M250-C20, C20B M250-C20R/2

3. MATERIAL INFORMATION

A. Configuration Chart

(1) Basis for quantities is per turbine assembly.

CEB-A-1407 CEB-A-72-4098

QTY/ QTY/ INSTRUCTIONS/ NEW P/N ENG NAME OLD P/N ENG DISPOSITION

23065818 1 Turbine Wheel, 3rd-Stage 23065818 1 1 ,2,3

23055944 1 . Turbin~-Whe~-~th-Stage 23055944-_ __ L_ 1 1 ,2,3 _

INSTRUCTIONS/DISPOSITION NOTES

1. New or inspected item.

2. Inspect removed item.

3. Return rejected wheels to Rolls-Royce.

November 29, 201 0 Revision 3 May 19, 2014

CUSTOMER SUPPORT ROLLS-ROYCE


©201 0, 2014 Rolls-Royce Corporation Page 5 of 5

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DATA TRANSMITTED TO:

EXPORT CONTROL COVER SHEET

PUBLICATIONS

ROYAL THAI ARMY

BANGKOK,

THAILAND

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REQUESTED BY: DATE:

HOW EXPORTED:

5/20/2014

SHIPMENT

DESCRIPTION OF DATA AND/OR HARDWARE TO INCLUDE TYPE OF DATA, ENGINE PROGRAM

APPLICATION, DETAILED DESCRIPTION:

CEB 250C20

250-C20, ·-C20B, -C20C, ·-C20F, -C20J, -C20S, ·-C20W

COMMERCIAL ENGINE BULLETINS

M250-C20 CEB A-1407 REV 3

WARNING STATEMENT:

Export Controlled Document

This document may contain information whose export is restricted by the arms Export Control Act (Title 22, U.S. C., Sec 2751, Et Seq.) or the Export Adminstration Act of 1979, as amended, (Title 50, U.S.C. App. 2401, Et. Seq.). Violations to these export laws are subject to severe criminal penalties.

DESTINATION CONTROL STATEMENT: (Check appropriate statement)

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These commodities, technology or software are subject to the Export Administration Regulations. Diversion contrary to U.S. Law prohibited.

These commodities are authorized by the U.S. Government for export only to for use by -.----· They may not be resold, diverted, transferred, or otherwise disposed of, to any other country or to any person other than the authorized end-user or consignee(s), either in their original form or after being incorporated into other end-items, without first obtaining approval of the U.S. Department of State or use of an applicable exemption.

SIGNATURE AUTHORIZATION BLOCK

Transmission of Rolls-Royce technical information and/or hardware to a foreign entity requires the approval of the Rolls-Royce North America Holdings Inc. Export Compliance Office or a Designated Representative.

Larry Patton

Global Trade Compliance Office or a Designated Representative

ECR Classification: N/A 9E991 NLR

Export Authorization Number

A record of all export transmissions against a valid authorization must be forwarded to the Global Trade Compliance Office, Speed Code S31 D or emailed to lntTradeComp@[email protected].

Individual pages containing technical data are to be marked "Export Controlled."

P030668

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