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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 (2015) 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 956-366 and up.
These serial numbers are the best available data.
The support bracket P/N 2319M62G01, bracket P/N 2351M34G01, and low pressure turbine (LPT) supply air ducts (air ducts) P/N 2403M43G01 and P/N 2403M37G01 are affected by this Service Bulletin.
B.Description
This Service Bulletin introduces new support bracket P/N 2554M80G01, bracket P/N 2554M81G01, and air duct P/N 2554M82G01.
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 new parts, improve reliability, and improve maintainability.
(2)Condition:
The current wiring routing includes a sharp bend in the wire between the accelerometer body and the first support bracket, as a result of this, local damage was observed.
(3)Cause:
Initial routing design was completed in accordance with minimum radio recommendations.
(4)Improvement:
The new proposed routing results in a larger bend radius between the accelerometer sensor and the first support.
(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
No additional man-hours are required to comply with this Service Bulletin.
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)
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: 575132
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
Two-way interchangeable.
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
 
2554M82G01
(1)
Duct, LPT Supply Air
12,140.00
(1)
30
 
2554M80G01
(1)
Bracket, Support
465.25
(1)
30
 
2554M81G01
(1)
Bracket
451.75
(1)
5
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
None.
(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
 
2376M20G05/ G06/G07/G08 /G09
(X)
Propulsor Module Assembly
2376M20G05/ G06/G07/G08 /G09
(X)
RM
-/-
 
2447M20G01/ G02/G03
(X)
Propulsor Module Assembly
2447M20G01/ G02/G03
(X)
RM
-/-
 
.2554M82G01
10-010B, 75-24-10
(1)
Duct, LPT Supply Air
(SIN 62201)
.2403M43G01
10-010, 75-24-10
(1)
RE
2/B
 
--
(-)
Duct, LPT Supply Air
(SIN 62201)
.2403M37G01
10-010A, 75-24-10
(ALT)
DE
5/A
 
.2554M80G01
01-220A, 72-54-00
01A-220A, 72-54-00
(1)
Bracket, Support
(SIN 65512)
.2319M62G01
01-220, 72-54-00
01A-220, 72-54-00
(1)
RE
2/B
 
.2554M81G01
01-190A, 72-54-00
01A-190A, 72-54-00
(1)
Bracket
(SIN 65513)
.2351M34G01
01-190, 72-54-00
01A-190, 72-54-00
(1)
RE
2/B
Operation Codes
DE=Delete
RE=Replace
RM=Remains
Change Codes
2=Two-way interchangeable.
5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Codes
A=Old parts will no longer be supplied. B=Old parts will be supplied until all old parts are sold.
D.Parts Disposition
Use serviceable old parts for engines that have not changed.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal
(1)For configuration 01:
(a)Remove the air duct (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, CONFIG 01, Subtask 72-00-02-030-409.
(b)Remove the bracket (1, Figure 2). Refer to the GEnx-1B EM, 72-54-00, DISASSEMBLY 001, CONFIG 01, Subtask 72-54-00-040-143.
(c)Remove the support bracket (3, Figure 2). Refer to the GEnx-1B EM, 72-54-00, DISASSEMBLY 001, CONFIG 01, Subtask 72-54-00-040-150.
(2)For configuration 02:
(a)Remove the air duct (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, CONFIG 02, Subtask 72-00-02-030-584.
(b)Remove the bracket (1, Figure 2). Refer to the GEnx-1B EM, 72-54-00, DISASSEMBLY 001, CONFIG 02, Subtask 72-54-00-040-173.
(c)Remove the support bracket (3, Figure 2). Refer to the GEnx-1B EM, 72-54-00, DISASSEMBLY 001, CONFIG 02, Subtask 72-54-00-040-179.
B.Installation
(1)For configuration 01:
(a)Install the new air duct (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 005, CONFIG 01, Subtask 72-00-02-440-152.
(b)Install the new bracket (1, Figure 2). Refer to the GEnx-1B EM, 72-54-00, ASSEMBLY 001, CONFIG 01, Subtask 72-54-00-440-013 and do as follows:
1Put the new bracket (1, Figure 2) on the LH ALF vent adapter (01-210, 72-54-00).
2Continue with the bolt installation. Refer to the GEnx-1B EM, 72-54-00, ASSEMBLY 001, CONFIG 01, Subtask 72-54-00-440-013.
(c)Install the new support bracket (3, Figure 2). Refer to the GEnx-1B EM, 72-54-00, ASSEMBLY 001, CONFIG 01, Subtask 72-54-00-440-189 and do as follows:
1Put the new support bracket (3, Figure 2) on the air adapter (01-240, 72-54-00).
2Continue with the installation. Refer to the GEnx-1B EM, 72-54-00, ASSEMBLY 001, CONFIG 01, Subtask 72-54-00-440-189.
(2)For configuration 02:
(a)Install the new air duct (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 005, CONFIG 02, Subtask 72-00-02-440-315.
(b)Install the new bracket (1, Figure 2). Refer to the GEnx-1B EM, 72-54-00, ASSEMBLY 001, CONFIG 02, Subtask 72-54-00-440-306 and do as follows:
1Put the new bracket (1, Figure 2) on the LH ALF vent adapter (01A-210, 72-54-00).
2Continue with the bolt installation. Refer to the GEnx-1B EM, 72-54-00, ASSEMBLY 001, CONFIG 02, Subtask 72-54-00-440-306.
(c)Install the new support bracket (3, Figure 2). Refer to the GEnx-1B EM, 72-54-00, ASSEMBLY 001, CONFIG 02, Subtask 72-54-00-440-317 and do as follows:
1Put the new support bracket (3, Figure 2) on the air adapter (01A-240, 72-54-00).
2Continue with the installation. Refer to the GEnx-1B EM, 72-54-00, ASSEMBLY 001, CONFIG 02, Subtask 72-54-00-440-317.
Removal/Installation of the Air Duct
Figure 1  
Removal/Installation of the Brackets in the TCF Assembly
Figure 2   (Sheet 1)
Removal/Installation of the Brackets in the TCF Assembly
Figure 2   (Sheet 2)