GE Designated: -CONFIDENTIAL-
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 part.
This technical data is considered subject to the Export Administration Regulations (EAR) pursuant to 15 CFR Parts 730-774. Transfer of this data by any means to a Non-U.S. 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 (2020) 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, -1B76/P2, -1B76A/P2
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 958-514 and up.
These serial numbers are the best available data.
The gasket P/N 2464M66P01 is affected by this Service Bulletin.
B.Description
This Service Bulletin introduces a new gasket P/N 2819M11P01 for the exhaust gas temperature (EGT) probe.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience after the old parts are all used.
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 on wing or in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce a new part.
(2)Condition:
If the gasket is not properly installed, hot air leaks causing high under cowl temperatures could result.
(3)Cause:
When attaching the EGT probe to the flanged mounting pad of the turbine center frame (TCF) outer case, the current gasket design allows for installation with improper orientation.
(4)Improvement:
The new gasket adds a lip on the forward side (countered side of the gasket) to ease the installation and to assure that the gasket is installed with the proper orientation. Also, the lip will be visible during the shop inspection.
(5)Substantiation:
Substantiation is by analysis and comparative analysis.
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
After you get access to the gasket, you will need approximately 0.5 man-hour for each engine or component.
H.Weight and Balance
Weight and balance are not changed.
I.References (Use the latest version of these documents)
GEnx-1B, Boeing 787 Aircraft Maintenance Manual (AMM)
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: 551502
BPP/EPEX No.: 18-72-54-78750
J.Publications Affected
GEnx-1B, Boeing 787 Aircraft Maintenance Manual (AMM)
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
 
2819M11P01
(8)
Gasket
105.50
(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
 
(GEnx-1B/P2 PRODUCTION)
 
2447M20G06
(X)
Propulsor Module Assembly
2447M20G06
(X)
RM
-/-
 
.2819M11P01
01-030B, 72-21-10
(8)
Gasket
(SIN 69850)
.2464M66P01
01-030A, 77-21-10
(8)
RE
2/B
 
{FIELD GEnx-1B [Entry Into Service (EIS)]/P1/P2}
 
2447M20G01/
G02/G03/G04/
G05/G06
(X)
Propulsor Module Assembly
2447M20G01/
G02/G03/G04/
G05/G06
(X)
RM
-/-
 
2376M20G06/
G07/G08/G09
(X)
Propulsor Module Assembly
2376M20G06/
G07/G08/G09
(X)
RM
-/-
 
2305M58G02/
G05
(X)
Turbine Center Frame Assembly
2305M58G02/
G05
(X)
RM
-/-
 
.2819M11P01
01-030B, 72-21-10
(8)
Gasket
(SIN 69850)
.2464M66P01
01-030A, 77-21-10
(8)
RE
2/B
Operation Codes
RE=Replace
RM=Remains
Change Codes
2=Two-way interchangeable.
Support Codes
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.General
(1)Remove the old EGT probe (01-010, Figure 1) and gasket (1) in accordance with the existing procedures in the GEnx-1B EM or GEnx-1B, Boeing 787 AMM.
(2)Installation instructions are modified to include the new gasket (1, Figure 1) with an orientation tab. These details are captured in updated installation instructions in the GEnx-1B EM and GEnx-1B, Boeing 787 AMM.
B.In-Shop Instructions
(1)Remove the old gasket (1, Figure 1). Removal instructions have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 003.
(2)Install the new gasket (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 004, CONFIG 01 or CONFIG 02. Installation instructions have changed. Use the post-GEnx-1B S/B 77-0016 configuration.
C.On-Wing Instructions
(1)Remove the old gasket (1, Figure 1). Removal instructions have not changed. Refer to the GEnx-1B, Boeing 787 AMM, 77-21-01, B787-A-G77-21-01-00A-520A-A.
(2)Install the new gasket (1, Figure 1). Refer to the GEnx-1B, Boeing 787 AMM, 77-21-01, B787-A-G77-21-01-00A-720A-A. Installation instructions have changed. Use the post-GEnx-1B S/B 77-0016 configuration.
Gasket Location
Figure 1   (Sheet 1)
Gasket Location
Figure 1   (Sheet 2)