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 (2023) 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 is applicable to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-101 through 958-855, 958-857 through 958-859, and 958-861.
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 958-856, 958-860, 958-862, and up.
These serial numbers are the best available data.
The combustor case P/N 2303M23G23 with key locked Inconel 718 self-locking screw thread insert (key locked insert) P/N J1466P04 is affected by this Service Bulletin.
B.Description
This Service Bulletin allows field rework of the affected combustor cases post-GEnx-1B S/B 72-0366 by the replacement of the old key locked insert with the new type of free-running key locked Inconel 718 screw thread insert (free-running key locked insert) P/N J1500P104.
C.Compliance
Category 4
GE recommends that you do this Service Bulletin when the fuel nozzle is removed and the key locked insert is damaged or replaced.
Impact C
This recommendation is to address a condition that may result in a Non-Event operational disruption, Unscheduled Engine Removals (UER), Out-Station-Removals or Aircraft on the Ground (AOG).
NOTE:
This Service Bulletin can be done on wing.
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
Do GEnx-1B S/B 73-0102 when you do this Service Bulletin.
E.Reason
(1)Objective:
To introduce new parts, rework parts, improve reliability, and improve maintainability.
(2)Condition:
The current key locked insert may cause the machine bolt to get seized. The seized machine bolt can be damaged during the removal.
(3)Cause:
The current key locked insert failures are caused by a high initial running torque on the assembly and seizure on the disassembly.
(4)Improvement:
The new type design free-running key locked insert have no self-locking feature. The new type design improves overall the fuel nozzle and igniter adapter bolted joint capability. The new free-running key locked insert lower the potential of getting the machine bolt seized, damaged, or broken.
(5)Substantiation:
Substantiation is by analysis, comparative analysis, test, and fleet experience.
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)
GEnx-1B, Boeing 787 Aircraft Maintenance Manual (AMM)
GEK 9250, Commercial Engine Standard Practices Manual (SPM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
GEnx-1B S/B 72-0366, ENGINE - Combustor Diffuser Assembly (72-41-00) - Introduction of New Combustor Case P/N 2303M23G23 with Improved Inconel 718 Thread Inserts
GEnx-1B S/B 73-0102, ENGINE FUEL AND CONTROL - Fuel Injection Nozzles (73-11-30) - On-Wing Fuel Nozzle Machine Bolt Replacement with Safety Cable Installation
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
CID: 8000901, 8000901-1
BPP/EPEX No.: 8000901, 8000901-1
J.Publications Affected
GEnx-1B, Boeing 787 Aircraft Maintenance Manual (AMM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
Qualified interchangeability.
The old key-locked insert and the new free-running key locked insert are two-way interchangeable. The new free-running key locked insert requires the installation of machine bolts with safety cable/wire released per GEnx-1B S/B 73-0102. Refer to paragraph 1.D., Concurrent Requirements.
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
 
J1500P104
(AR)
Insert, Free-Running Key Locked Inco718 Screw Thread
Quote
(-)
--
NOTE:
Prices are found in the GE Materials Catalog.
(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
 
2376M54G02/
G05/G06/G07/
G08/G09/G10/
G11
(X)
Combustor Diffuser Assembly
2376M54G02/
G05/G06/G07/
G08/G09/G10/
G11
(X)
RM
-/-
 
.2303M23G23
(X)
Case, Combustor
.2303M23G23
(X)
RM
-/-
 
..J1500P104
01-235A, 72-41-00
(92)
Insert, Key Locked Inconel 718 Self-Locking Screw Thread
(Old Name)
Insert, Free- Running Key Locked Inco718 Screw Thread
(New Name)
(SIN 12001-8)
..J1466P04
01-235, 72-41-00
(92)
RE
5/-
 
..J1466P04
01-235B, 72-41-00
(ALT)
Insert, Key Locked Inconel 718 Self-Locking Screw Thread
(SIN 12001-8)
--
(-)
AD
5/-
Operation Codes
AD=Add
RE=Replace
RM=Remains
Change Codes
5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Codes
None.
D.Parts Disposition
Discard old parts.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
NOTE:
During on-wing maintenance done in accordance with the GEnx-1B, Boeing 787 AMM, the igniter adapter is not removed and therefore the igniter pad inserts are not exposed. However, in case of insert exposure for some reason, and if insert replacement is desired, the same procedure in paragraph 3.B., Post-GEnx-1B S/B 72-0366 Fuel Nozzle Pad Key Locked Insert Replacement can be applied.
B.Post-GEnx-1B S/B 72-0366 Fuel Nozzle Pad Key Locked Insert Replacement
(1)Remove the old key locked insert (1, Figure 1) from the combustor case. Removal instructions have not changed. Refer to the GEnx-1B, Boeing 787 AMM, G70-48-13, KEY-LOCK INSERT - REPLACEMENT, DMC-B787-A-G70-48-13-00A-921A-A.
(2)Install the new free-running key locked insert (1, Figure 1) on the combustor case. Installation instructions have not changed. Refer to the SPM, 70-48-11, INSTALLATION OF KEY-LOCKED INSERTS.
Old Key Locked Insert Location
Figure 1   (Sheet 1)
Old Key Locked Insert Location
Figure 1   (Sheet 2)