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Copyright (2022) 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 958-839.
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 958-840 and up.
These serial numbers are the best available data.
The machine bolts P/N J1494P15A and P/N AS3237-16 are affected by this Service Bulletin.
B.Description
This Service Bulletin provides instructions to replace all the affected machine bolts with new short machine bolts P/N J1494P13B or P/N AS3244-14 with safety cable kit (safety cable) or safety wire retention feature.
C.Compliance
Category 3
GE recommends that you do this Service Bulletin at the next shop visit of the engine/module.
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).
Compliance with this Service Bulletin is the closing action for GEnx-1B S/B 73-0057 and/or GEnx-1B S/B 73-0059.
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 and improve reliability.
(2)Condition:
The machine bolt sizing issue is observed during fuel nozzle removal. In the worst scenario, a machine bolt breakage occurs, which causes an increase in maintenance time and high risk of combustor diffuser nozzle (CDN) case damage.
(3)Cause:
The machine bolt/insert sizing issue is driven by the machine bolt tip oxidation accumulation and machine bolt thread deformation/damage by the fuel nozzle inserts crimped feature (occurred during installation and removal). The new short machine bolts will reduce the risk coming from oxidation.
(4)Improvement:
The current fuel nozzle machine bolt is being replaced with a new short machine bolt at all 88 locations. This will reduce machine bolt tip protrusion from the insert, which reduces machine bolt tip oxidation. The new machine bolts will be secured with safety cable/wire to avoid machine bolt liberation recognized by GEnx-1B S/B 73-0057 and GEnx-1B S/B 73-0059.
This is also the first part of the effort related to the machine bolt/insert sizing containment plan, where short machine bolts with safety cable/wire release is a first step and later another Service Bulletin will release free running inserts, where short machine bolts with safety cable/wire will be an obligatory solution.
(5)Substantiation:
Substantiation is by analysis, comparative analysis, 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
After you replace all the machine bolts with new ones, the safety cable/wire installation process for the full set is taking 70 minutes for each engine.
H.Weight and Balance
Weight and balance are not changed.
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)
GEnx-1B S/B 73-0057, ENGINE FUEL AND CONTROL - Fuel Injection Nozzles (73-11-30) - Fuel Nozzle Machine Bolt Replacement
GEnx-1B S/B 73-0059, ENGINE FUEL AND CONTROL - Fuel Injection Nozzles (73-11-30) - Fuel Nozzle Machine Bolt Replacement
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
CID: 8004389
BPP/EPEX No.: 8004389
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
Qualified Interchangeability.
The new short machine bolts are one-way interchangeable with the old long type of the machine bolts. The new machine bolts are replaced with an as required amount of safety cable/wire secondary retention feature. The new short machine bolts require an obligatory safety cable/wire secondary retention feature installation (the new machine bolts have secondary retention feature holes in the bolthead).
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
 
2255M93P01
(22)
Seal Assembly
Quote
(-)
--
 
2255M93P04
(ALT)
Seal Assembly
Quote
(-)
--
 
J1494P13B
(88)
Bolt, Machine
Quote
(-)
--
 
AS3244-14*
(ALT)
Bolt, Machine
NP
(-)
--
 
736L680G01
(AR)
Kit, Safety Cable
Quote
(-)
--
 
R297P04
(ALT)
Wire, Safety
Quote
(-)
--
*Part not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase.
NP = Not Provisioned
NOTE:
Prices are found in the GE Materials Catalog.
(2)Other Spare Parts:
None.
(3)Consumables:
 
Code Number
Description
 
C10-071
Safety Wire 0.032 inch diameter (only AMS 5689, 321 Stainless Steel) (safety wire)
 
C10-143
Safety Cable Assembly (safety cable)
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
 
(PRODUCTION ONLY)
 
2376M45G10
(X)
Combustor Diffuser Nozzle Assembly
2376M45G10
(X)
RM
-/-
 
.2376M54G12
01-093H, 72-40-00
(1)
Combustor Diffuser Assembly
(SIN 12000)
.2376M54G09
01-093D, 72-40-00
01-093G, 72-40-00
(1)
RW
5/A
 
..J1494P13B
06-010E, 73-11-30
(88)
Bolt, Machine
(SIN 12520)
..J1494P15A
06-010A, 73-11-30
(88)
RE
5/E
 
..AS3244-14
06-010F, 73-11-30
(ALT)
Bolt, Machine
(SIN 12520)
..AS3237-16
06-010B, 73-11-30
(ALT)
RE
5/E
 
..736L680G01
06-250, 73-11-30
(AR)
Kit, Safety Cable
(SIN 12599)
--
(-)
AD
5/-
 
..R297P04
06-250A, 73-11-30
(ALT)
Wire, Safety
(SIN 12599)
--
(-)
AD
5/-
 
(FIELD ONLY)
 
2376M54G01/
G02/G03/G04/
G06
(X)
Combustor Diffuser Nozzle Assembly
2376M54G01/
G02/G03/G04/
G06
(X)
RM
-/-
 
.J1494P13B
05-010C, 73-11-30
(88)
Bolt, Machine
(SIN 12520)
.J1494P15A
05-010A, 73-11-30
(88)
RE
5/E
 
.AS3244-14
05-010D, 73-11-30
(ALT)
Bolt, Machine
(SIN 12520)
.AS3237-16
05-010B, 73-11-30
(ALT)
RE
5/E
 
.736L680G01
05-250, 73-11-30
(AR)
Kit, Safety Cable
(SIN 12599)
--
(-)
AD
5/-
 
.R297P04
05-250A, 73-11-30
(ALT)
Wire, Safety
(SIN 12599)
--
(-)
AD
5/-
 
2376M54G05/
G07/G08/G09/
G10/G11
(X)
Combustor Diffuser Nozzle Assembly
2376M54G05/
G07/G08/G09/
G10/G11
(X)
RM
-/-
 
.J1494P13B
06-010E, 73-11-30
(88)
Bolt, Machine
(SIN 12520)
.J1494P15A
06-010A, 73-11-30
(88)
RE
5/E
 
.AS3244-14
06-010F, 73-11-30
(ALT)
Bolt, Machine
(SIN 12520)
.AS3237-16
06-010B, 73-11-30
(ALT)
RE
5/E
 
.736L680G01
06-250, 73-11-30
(AR)
Kit, Safety Cable
(SIN 12599)
--
(-)
AD
5/-
 
.R297P04
06-250A, 73-11-30
(ALT)
Wire, Safety
(SIN 12599)
--
(-)
AD
5/-
Operation Codes
AD=Add
RE=Replace
RM=Remains
RW=Rework
Change Codes
5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Codes
A=Old parts will no longer be supplied. E=Old parts will be supplied, and can be used at other engine locations.
D.Parts Disposition
Discard old parts.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
(1)Remove the fuel nozzles (Figure 1). Removal instructions for the fuel nozzles have not changed. Refer to the GEnx-1B EM, 72-41-00, DISASSEMBLY 001, CONFIG 01, Subtask 72-41-00-040-024 or CONFIG 02, Subtask 72-41-00-040-044 and do as follows:
(a)Discard the old machine bolts (1, Figure 1) and the seal assemblies (C-seals) under the fuel nozzles.
(2)Install the fuel nozzles with the new machine bolts (1, Figure 1) and new C-seals. Installation instructions for the fuel nozzles have changed. Refer to the GEnx-1B EM, 72-40-00, ASSEMBLY 001, CONFIG 01, Subtask 72-40-00-440-085 or CONFIG 02, Subtask 72-40-00-440-180 and do as follows:
CAUTION:
IF C10-071 SAFETY WIRE IS USED, MAKE SURE THAT IT AGREES WITH ALL REQUIREMENTS (0.032 INCH DIAMETER AND MATERIAL AMS 5689, 321 STAINLESS STEEL).
(a)Safety the new machine bolts (1, Figure 1) with C10-143 safety cable or C10-071 safety wire. Refer to the SPM, 70-11-01, SAFETY WIRE PROCEDURE, for safety wire installation, 70-11-02, SAFETY CABLE PROCEDURE, for safety cable installation, Figure 2 and Figure 3 of this Service Bulletin, and do as follows:
1Pair two neighbor machine bolts (1, Figure 1) next to each other with the sequence that follows:
aStandard routing of C10-143 safety cable or C10-071 safety wire is forward-aft sequence. Refer to Figure 2.
bFor locations where standard forward-aft routing is not possible, continue with side sequence. Refer to Figure 3.
NOTE:
You must not put the safety cable/wire over the brackets.
NOTE:
Safety cable/wire contact with fuel nozzle bodies with side sequence applied is a normal condition.
2Do an inspection of all safety cables/wires on the new machine bolts (1, Figure 1) to make sure that none are neutral or pulling loose.
Fuel Nozzle and Machine Bolt Location
Figure 1   (Sheet 1)
Fuel Nozzle and Machine Bolt Location
Figure 1   (Sheet 2)
Standard Forward-Aft Safety Cable/Wire Routing Sequence Example
Figure 2  
Alternative Side Safety Cable/Wire Routing Sequence Example
Figure 3   (Sheet 1)
Alternative Side Safety Cable/Wire Routing Sequence Example
Figure 3   (Sheet 2)