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 (2017) General Electric Company, U.S.A.
1.PLANNING INFORMATION
A.Effectivity
* * * FOR 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 has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956860 and up.
These serial numbers are the best available data.
The high pressure turbine cooling (HPTC) air manifolds (air manifolds) P/N 2613M38G01, P/N 2613M39G01, P/N 2613M40G01, P/N 2613M41G01, P/N 2594M75G01, P/N 2594M76G01, P/N 2594M77G01, and P/N 2594M78G01 are affected by this Service Bulletin.
B.Description
This Service Bulletin introduces new air manifolds that include a new design 7th stage check valve optimized flapper.
C.Compliance
Category 5
GE recommends that you do this Service Bulletin as soon as the air manifolds are removed from the engine.
Impact E
This recommendation is to improve the cost of ownership, reduce maintenance requirements or is a product improvement.
NOTE:
This Service Bulletin can be done in shop.
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 operators fleet.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts.
(2)Condition:
The high pressure turbine (HPT) cooling air was found to be leaking into the 7th stage manifolds and, causing failure on the duct and the unreliable compressor side flange causes flutters in flappers.
(3)Cause:
The 7th stage manifold check valve pin and flappers have been observed to be worn out in the field.
(4)Improvement:
This Service Bulletin introduces a new design to improve the check valve durability, eliminating the probability of liberated flappers and pins, enabling the valve to contain HPTC flow in the event of one or more broken 7th stage manifolds.
(5)Substantiation:
Substantiation is by comparative analysis and test.
F.Approval
The data contained in this Service Bulletin has been reviewed by the FAA or authorized entity representing the FAA 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: 575720
BPP: 15-72-00-41172
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
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
 
2677M79G01
(1)
Manifold, HPTC Air
16,500
(1)
5
 
2677M81G01
(1)
Manifold, HPTC Air
16,500
(1)
5
 
2677M82G01
(1)
Manifold, HPTC Air
16,500
(1)
5
 
2677M83G01
(1)
Manifold, HPTC Air
16,500
(1)
5
 
OR
 
2677M84G01
(1)
Manifold, HPTC Air
16,500
(1)
5
 
2677M85G01
(1)
Manifold, HPTC Air
16,500
(1)
5
 
2677M86G01
(1)
Manifold, HPTC Air
16,500
(1)
5
 
2677M87G01
(1)
Manifold, HPTC Air
16,500
(1)
5
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
 
2376M20G05/
G06/G07/G08/
G09
(X)
Propulsor Module Assembly
2376M20G05/
G06/G07/G08/
G09
(X)
RM
-/-
 
.2677M79G01
20-020C, 75-24-30
(1)
Manifold, HPTC Air
(SIN 61100)
.2613M38G01
20-020B, 75-24-30
(1)
RW/RE
1/A
 
.2677M81G01
20-030D, 75-24-30
(1)
Manifold, HPTC Air
(SIN 61101)
.2613M39G01
20-030C, 75-24-30
(1)
RW/RE
1/A
 
.2677M82G01
20-040C, 75-24-30
(1)
Manifold, HPTC Air
(SIN 61102)
.2613M40G01
20-040B, 75-24-30
(1)
RW/RE
1/A
 
.2677M83G01
20-010C, 75-24-30
(1)
Manifold, HPTC Air
(SIN 61103)
.2613M41G01
20-010B, 75-24-30
(1)
RW/RE
1/A
 
2447M20G01/
G02/G03/G04
(X)
Propulsor Module Assembly
2447M20G01/
G02/G03/G04
(X)
RM
-/-
 
.2677M84G01
20-021B, 75-24-30
(1)
Manifold, HPTC Air
(SIN 61100)
.2594M75G01
20-021A, 75-24-30
(1)
RW/RE
1/A
 
.2677M85G01
20-031B, 75-24-30
(1)
Manifold, HPTC Air
(SIN 61101)
.2594M76G01
20-031A, 75-24-30
(1)
RW/RE
1/A
 
.2677M86G01
20-041B, 75-24-30
(1)
Manifold, HPTC Air
(SIN 61102)
.2594M77G01
20-041A, 75-24-30
(1)
RW/RE
1/A
 
.2677M87G01
20-011B, 75-24-30
(1)
Manifold, HPTC Air
(SIN 61103)
.2594M78G01
20-011A, 75-24-30
(1)
RW/RE
1/A
Operation Codes
RE=Replace
RM=Remains
RW=Rework
Change Codes
1=One-way interchangeable.
Support Codes
A=Old parts will no longer be supplied.
D.Parts Disposition
Send the removed manifolds for rework to the address that follows:
 
Unison Industries
2070 Heller Drive
Xenia, OH 45385
U.S.A.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal
(1)Remove the air manifolds (1, 2, 3, and 4, Figure 1). Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 003.
B.Rework
(1)Send the removed air manifolds to Unison Industries for rework. Refer to paragraph 2.D., Parts Disposition for contact information.
C.Installation
(1)Install the new air manifolds (1, 2, 3, and 4, Figure 1) as follows:
(a)For GEnx-1B configuration 01 engines, refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 004, CONFIG 01.
(b)For GEnx-1B configuration 02 engines, refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 004, CONFIG 02.
7th Stage Manifold Location
Figure 1