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.
Copyright (2014) General Electric Company, U.S.A.
1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B54/P1, -1B54/P2, -1B58, -1B58/P1, -1B58/P2, -1B64, -1B64/P1, -1B64/P2, -1B67, -1B67/P1, -1B67/P2, -1B70, -1B70/72/P1, -1B70/72/P2, -1B70/75/P1, -1B70/75/P2, -1B70/P1, -1B70/P2, -1B74/75/P1, -1B74/75/P2, -1B75/P1, -1B75/P2, -1B78/P2
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-330 and up.
These serial numbers are the best available data.
The support bracket P/N 2372M55G01, oil supply bracket P/N 2372M58G01, machine bolt P/N AS3237-08, and machine bolt P/N MS9556-06 are affected by this Service Bulletin.
B.Description
This Service Bulletin introduces a new support bracket P/N 2497M23G01 and machine bolt P/N MS9556-08 to eliminate any contact between the high pressure turbine cooling (HPTC) air manifold P/N 2542M06G01 and the current support bracket.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience/option.
NOTE:
This Service Bulletin can be accomplished in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce a new part, improve reliability, and improve maintainability.
(2)Condition:
Potential interference between the support bracket and HPTC air manifold. When this manifold is tightened, the edge of a tee section in the manifold can contact the support bracket.
(3)Cause:
When the tab on the support bracket was bent to accommodate the oil supply bracket, it should have been angled away from the HPTC air manifold to allow for the larger diameter of the tee.
(4)Improvement:
The proposed design eliminates any contact between the HPTC air manifold and support bracket, eliminating the oil supply bracket and forming a single bracket.
(5)Substantiation:
Substantiation is by comparative analysis.
F.Approval
This Service Bulletin has been reviewed by the FAA and the repair(s) and modification(s) herein comply with the applicable Federal Aviation Regulations and are FAA APPROVED for installation in the model(s) listed in this Service Bulletin.
G.Manpower
No additional man-hours are required to comply with this Service Bulletin.
H.Weight and Balance
The complete compliance with this Service Bulletin decreases weight by 0.47 lb (0.21 kg).
I.References (Use the latest version of these documents)
GEK 9250, Commercial Engine Standard Practices Manual (SPM)
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
CID: 575009
BPP: 11-72-00-15
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
The proposed and superseded configurations must be introduced in complete engine sets. Mixing the details of the proposed and superseded configurations is not permitted.
L.Software Accomplishment Summary
Not applicable.
2.MATERIAL INFORMATION
A.Material - Price and Availability
(1)Parts necessary to do this Service Bulletin:
 
Part Number
Qty/ Eng
Part Name
Unit ($) Price
Pkg Qty
Lead Time Days
 
2497M23G01
(1)
Bracket, Support
709.00
(1)
1
 
MS9556-08*
(2)
Bolt, Machine
NP
(-)
--
 
2303M76P01
(1)
Gasket, Metal
34.50
(1)
5
 
J1215P17
(1)
Gasket, Flange Seal
57.75
(5)
5
*Part not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase.
NP = Not Provisioned
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
None.
(3)Consumables:
 
Code Number
Description
 
C02-058
Compound, Thread Lubricating
(lubricant)
 
C10-182
Cloth, Cleaning for Aircraft Structural
(cleaning cloth)
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
 
2376M20G05/ G06/G07/G08/ G09
(X)
Propulsor Module Assembly
2376M20G05/ G06/G07/G08/ G09
(X)
RM
-/-
 
2447M20G01/ G02
(X)
Propulsor Module Assembly
2447M20G01/ G02
(X)
RM
-/-
 
.2497M23G01
10-230, 79-22-20
(1)
Bracket, Support
(SIN 45210)
.2372M55G01
01-260, 72-54-00
01A-260, 72-54-00
(1)
RE
5/B
 
--
(-)
Bracket, Oil Supply
(SIN 45410)
.2372M58G01
10-160, 79-22-20
(1)
DE
5/B
 
--
(-)
Bolt, Machine
(SIN 45420)
.AS3237-08
10-170, 79-22-20
(2)
DE
5/E
 
.MS9556-08
10-111, 79-22-20
(2)
Bolt, Machine
(SIN 45422)
.MS9556-06
10-110, 79-22-20
(2)
RE
5/E
Operation Codes
DE=Delete
RE=Replace
RM=Remains
Change Codes
5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Codes
B=Old parts will be supplied until all old parts are sold. E=Old parts will be supplied, and can be used at other engine locations.
D.Parts Disposition
Use serviceable old oil supply bracket P/N 2372M58G01 and support bracket P/N 2372M55G01 for engines that have not changed.
Use serviceable old machine bolts P/N MS9556-06 and P/N AS3237-08 at other engine locations.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Disassembly
(1)Remove the scavenge oil tube (10-100, 79-22-20) from the support bracket (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, Subtask 72-00-02-030-434, steps 3.L.(1) through 3.L.(4).
(2)Remove the oil tube hose (10-050, 79-22-20) from the support bracket (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 003, Subtask 72-00-02-030-373.
(3)Remove the air adapter (01-310, 72-54-00) and support bracket (1, Figure 1) from the turbine center frame (TCF) assembly (35-015, 72-00-02) at strut No. 6. Refer to the GEnx-1B EM, 72-54-00, DISASSEMBLY 001, Subtask 72-54-00-040-146.
NOTE:
The oil supply bracket (10-160, 79-22-20) will be removed together with the support bracket (1, Figure 1).
B.Assembly
(1)Attach the air adapter (01A-310, 72-54-00) and the support bracket (1, Figure 1) to the TCF assembly (35-015, 72-00-02) at strut No. 6. Refer to the GEnx-1B EM, 72-54-00, ASSEMBLY 001, CONFIG 02, Subtask 72-54-00-440-311, and do as follows:
WARNING:
REFER TO THE PRODUCT LABEL AND THE MANUFACTURERS (MATERIAL) SAFETY DATA SHEET FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING AND PROPER USE OF THIS PRODUCT.
(a)Apply C02-058 lubricant to the threads and bearing (friction) surfaces of the machine bolts (01-010 or 01A-010, 72-54-00) and (01-020 or 01A-020) as follows:
1Use a minimum quantity of C02-058 lubricant necessary for assembly.
2After assembly, remove the remaining lubricant with a C10-182 cleaning cloth.
(b)Install a metal gasket (01-070 or 01A-070) on the outer pad of the TCF (35-015, 72-00-02) at strut No. 6. Make sure that the metal gasket (01-070 or 01A-070, 72-54-00) is new and that the lifted surface is outboard.
(c)Install the air adapter (01-310 or 01A-310) in position on the metal gasket (01-070 or 01A-070).
(d)Make sure that the outboard end of the scavenge tube (01-651 or 01A-651) is through the hole in the air adapter (01-310 or 01A-310).
(e)Align the new support bracket (1, Figure 1) with the holes in the air adapter (01-310 or 01A-310, 72-54-00).
CAUTION:
MACHINE BOLTS (01-020 OR 01A-020) ARE LONG AND HAVE A BRACKET INSTALLED. DO NOT TORQUE THE MACHINE BOLTS (01-020 OR 01A-020) OR DAMAGE TO THE LINER CAN OCCUR.
(f)Install the machine bolts (01-010 or 01A-010) and (01-020 or 01A-020) through the new support bracket (1, Figure 1), air adapter (01-310 or 01A-310, 72-54-00), and metal gasket (01-070 or 01A-070) into the TCF assembly (35-015, 72-00-02). Tighten the machine bolts (01-010 or 01A-010, 72-54-00) and (01-020 or 01A-020) with your hand.
(g)Torque the two machine bolts (01-010 or 01A-010) and (01-020 or 01A-020) to 106-124 lb in. (12.0-14.0 Nm).
(2)Attach the oil tube hose (10-050, 79-22-20) to the support bracket (1, Figure 1) with a cushioned loop clamp (cushioned clamp) (10-120, 79-22-20) and a new machine bolt (2). Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 004.
(3)Install the scavenge oil tube (10-100, 79-22-20) to the support bracket (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 005.
Location of the Support Bracket
Figure 1   (Sheet 1)
Location of the Support Bracket
Figure 1   (Sheet 2)