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GEnx-1B (LR) Service Bulletins (SBs) SB 72-0331 R01 ENGINE - LPT Module (72-00-02) - Introduction of Reworked Extension Duct Date Printed:

2017/12/08 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled;

transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.

Page 1 of 5 GEnx-1B SERVICE BULLETIN - 72-0331 R01 Revised:08/21/2017 SB 72-0331 R01 ENGINE - LPT MODULE (72-00-02) -

INTRODUCTION OF REWORKED EXTENSION DUCT Issued:

09/16/2016

GE PROPRIETARY INFORMATION The information contained in this document is GE proprietary information and is disclosed in confidence. It is the property of GE and shall not be used, disclosed to others or reproduced without the express written consent of GE, including, but without limitation, it is not to be used in the creation, manufacture, development, or derivation of any repairs, modifications, spare parts, designs, or configuration changes or to obtain FAA or any other government or regulatory approval to do so. If consent is given for reproduction in whole or in part, this notice and the notice set forth on each page of this document shall appear in any such reproduction in whole or in part.

This technical data is considered EAR controlled pursuant to 15 CFR Parts 730-774 respectively. Transfer of this data by any means to a Non-US Person, whether in the United States or abroad, without the proper U.S. Government authorization (e.g., License, exemption, NLR, etc.), is strictly prohibited.

TRANSMITTAL INFORMATION REVISION 1 TO SERVICE BULLETIN 72-0331 Revision 1 is issued to update paragraph 1.C., .Compliance The original was issued September 16, 2016. Revision bars in the left margin identify changes.

1. PLANNING INFORMATION A. Effectivity * * * GEnx-1B64, -1B64/P1, -1B64/P2, -1B67, -1B67/P1, -1B67/P2, -1B70, -1B70/75/P1, -1B70/75/P2, -1B70/P1, -1B70/P2, -1B70C/P1, -1B70C/P2, -1B74/75/P1, -1B74/75/P2 This Service Bulletin is applicable to these GEnx-1B engines:

*GEnx-1B engines, serial numbers 956-001 through 956-806.

This Service Bulletin has been introduced in production to these GEnx-1B engines:

*GEnx-1B engines, serial numbers 956-807 and up.

These serial numbers are the best available data.

The air/oil (A/O) extension ducts (extension ducts) P/N and P/N are affected by this Service2332M85P01 2331M25G03 Bulletin.

B. Description This Service Bulletin introduces a new extension duct P/N

Page 2Open in PDF

GEnx-1B (LR) Service Bulletins (SBs) SB 72-0331 R01 ENGINE - LPT Module (72-00-02) - Introduction of Reworked Extension Duct Date Printed:

2017/12/08 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled;

transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.

Page 2 of 5 and a reworked extension duct P/N .2332M85P02 2331M25G04 Also, this Service Bulletin provides instructions to rework the affected extension ducts.

C. Compliance Category 3 GE recommends that you do this Service Bulletin at the next shop visit of the engine/module.

Impact A This recommendation is to address a condition that may affect Flight Safety.

NOTE:This Service Bulletin can be done in shop.

NOTE:This applies also to quick-turn shop visits.

This Service Bulletin is offered to improve the reliability or performance of your GE product, or to help prevent the occurrence of the event or condition described in this Service Bulletin. If the operator elects not to participate in the bulletin, that decision will be taken into consideration by GE in evaluating future product performance issues that may arise in the operator's fleet.

D. Concurrent Requirements None.

E. Reason

(1) Objective:

To introduce new parts, rework parts, and improve maintainability.

(2) Condition:

Routine teardowns have occurred at overhaul shop, finding tannic oil collected in the fan mid shaft (FMS) with deteriorating paint, seals, coke, and corrosion pittings of the FMS.

(3) Cause:

Oil leaking into the FMS inner cavity causes corrosion on the FMS inner surface and degradation in O-rings and/or seal assembly.

(4) Improvement:

Introduction of a new extension duct with air holes in the front flange as countermeasure against oil leaks into the FMS inner surface. A pressurized air flow path through the holes avoids leaks during the operation.

For field engines: Rework the extension ducts with 18 air holes of 0.1968 inch (5.00 mm) diameter on the front flange as countermeasure against oil leaking into the FMS.

(5) Substantiation:

Substantiation is by analysis and comparative analysis.

F. Approval The data contained in this Service Bulletin has been reviewed by the appropriate governmental authority and the repair(s) and modification(s) herein comply with the applicable Aviation Regulations and are APPROVED for installation in the model(s) listed in this Service Bulletin.

G. Manpower After you get access to the FMS, you will need approximately 4 man-hours for each engine or component.

H. Weight and Balance Weight and balance are not changed.

I. References (Use the latest version of these documents) GEK 112851, GEnx-1B Engine Manual (EM)

Page 3Open in PDF

GEnx-1B (LR) Service Bulletins (SBs) SB 72-0331 R01 ENGINE - LPT Module (72-00-02) - Introduction of Reworked Extension Duct Date Printed:

2017/12/08 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled;

transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.

Page 3 of 5 GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR) GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) Repair Document (RD) 810-336 (L1 or higher), Low Pressure Turbine Extension Duct - Alteration - Additional Air Holes to Forward Flange NOTE:The reference documents listed below are for the engine manufacturer's internal use only:

CID: 943081 BPP: 16-79-00-55093 J. Publications Affected GEK 112851, GEnx-1B Engine Manual (EM) GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR) GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) K. Interchangeability One-way interchangeable.

L. Software Accomplishment Summary Not applicable.

2. MATERIAL INFORMATION A. Material - Price and Availability

(1) Parts necessary to do this Service Bulletin:

None.

(2) Other Spare Parts:

Part Number Qty/ Eng Part Name Unit ($) Price Pkg Qty Lead Time Days 2332M85P02 (1) Duct, A/O Extension 16,270.00 (1) Quote NOTE:Prices are provided for planning purposes and are subject to change.

(3) Consumables:

None.

B. Industry Support Information None.

C. Configuration Chart New Part Number Qty/ Eng Part Name Old Part Number/ IPC Location Qty/ Eng Op Code Chg/ Sprt Code (PRODUCTION ONLY) 2376M20G06/ G07/G08/G09 (X) Assembly, Propulsor Module 2376M20G06/ G07/G08/G09 (X) RM -/- 2447M20G01/ G02/G03/G04 (X) Assembly, Propulsor Module 2447M20G01/ G02/G03/G04 (X) RM -/- . 2332M85P02 45-270B,72-00-02

(1) Duct, A/O Extension (SIN 810A8) . 2332M85P01 45-270A,72-00-02

(1) RE/ RW/RI 1/A (FIELD ONLY) 2376M20G05/ G06/G07/G08/ G09 (X) Assembly, Propulsor Module 2376M20G05/ G06/G07/G08/ G09 (X) RM -/- 2447M20G01/ G02/G03/G04 (X) Assembly, Propulsor Module 2447M20G01/ G02/G03/G04 (X) RM -/- . 2332M85P02 45-270B,72-00-02

(1) Duct, A/O Extension (SIN 810A8) . 2332M85P01 45-270A,72-00-02

(1) RE/ RW/RI 1/A 2376M20G05 (X) Assembly, 2376M20G05 (X) RM -/-

Page 4Open in PDF

GEnx-1B (LR) Service Bulletins (SBs) SB 72-0331 R01 ENGINE - LPT Module (72-00-02) - Introduction of Reworked Extension Duct Date Printed:

2017/12/08 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled;

transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.

Page 4 of 5 Propulsor Module . 2331M25G04 45-270C,72-00-02

(1) Duct, A/O Extension (SIN 810A8) . 2331M25G03 45-270,72-00-02

(1) RW/ RI 1/- Operation Codes RE=Replace RI=Reidentify RM=Remains RW=Rework Change Codes 1=One-way interchangeable.

Support Codes A=Old parts will no longer be supplied.

D. Parts Disposition Rework.

E. Tooling - Price and Availability None.

3. ACCOMPLISHMENT INSTRUCTIONS A. General

(1) Remove the extension duct (1, Refer to the GEnx-1B EM,Figure 1).

72-00-04, DISASSEMBLY 001.

NOTICE

APPROVAL OF REWORK SOURCES The repair referred to below contains complex processes that could affect engine reliability and/or performance. Therefore it is necessary to substantiate the ability and adequacy of a repair source to successfully accomplish the repair. A Technical License Agreement is also required.

Information concerning a Technical License Agreement is available from:

ATTN.: Manager, Technical Licensing GE Aviation One Neumann Way, M/D RM100 Cincinnati, Ohio 45215-6301 U.S.A.

After the repair source has obtained a Technical License Agreement, the Repair Document and the Repair Source Substantiation requirements may be obtained from:

ATTN.: Repair Substantiation GE Aviation One Neumann Way, M/D S171 Cincinnati, Ohio 45215-6301 U.S.A.

OR Phone: (513) 552-9563 Fax: (513) 552-9587

(2) Rework and reidentify the old extension duct (1, Refer to RDFigure 1).

810-336.

(3) Install the new or reworked extension duct (1, Refer to theFigure 1).

GEnx-1B EM, 72-00-04, ASSEMBLY 001, CONFIGURATION 01.

Page 5OCROpen in PDF

GEnx-1B (LR) Service Bulletins (SBS) SB 72-0331 R01 ENGINE - LPT Module (72-00-02) - Introduction of Reworked Extension Duct

OLD CONFIGURATION 1 REF LEGEND:

1. EXTENSION DUCT

REPLACE OLD PART

WITH NEW P/N 2332M85P02 OR

REWORKED NEW CONFIGURATION P/N 2332M85P02 OR P/N 2331M25G04 5033544-00 Extension Duct Replacement Figure 1 GE PROPRIETARY INFORMATION - Subject to the restrictions on the media.

GE PROPRIETARY INFORMATION - Not to be used, disclosed to Date Printed: others or reproduced without the express written consent of Page 2017/12/08 GE. Technical data is considered ITAR and/or EAR controlled; 5 of 5 transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited.