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Copyright (2017) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION
REVISION 2 TO SERVICE BULLETIN 72-0349
Revision 2 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS.
Revision 1 was issued March 20, 2017. The original was issued December 16, 2016. Revision bars in the left margin identify changes.
1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B64/P2, -1B67/P2, -1B70/P2, -1B70C/P2, -1B70/75/P2, -1B74/75/P2, -1B76A/P2
 This Service Bulletin has been introduced in production to these GEnx-1B engines:
 •
GEnx-1B engines, serial numbers 956-975 and up.
 These serial numbers are the best available data.
The stage 10 outlet guide vanes (OGVs) P/N 2303M16G04, P/N 2303M16G06, and P/N 2303M16G07 are affected by this Service Bulletin.
B.Description
 This Service Bulletin releases new and modification configurations for the stage 10 OGVs to recover parts found in service with damage that were previously unserviceable.
 This Service Bulletin introduces the new stage 10 OGV P/N 2303M16G08 to address wear generated by the adjacent piston ring.
 This Service Bulletin introduces equivalent reworked stage 10 OGVs P/N 2763M05G02, P/N 2763M05G03, and P/N 2763M05G04 to address wear generated by the adjacent piston ring. This configuration contains a weld buildup restoration of the forward rail.
 This Service Bulletin also introduces equivalent reworked stage 10 OGVs P/N 2763M05G05, P/N 2763M05G06, and P/N 2763M05G07 to address wear generated by the adjacent piston ring. This configuration contains a wear resistant coating buildup restoration of the forward rail.
C.Compliance
 Category 3
 GE recommends that you do this Service Bulletin at the next shop visit of the engine.
 Impact B
 This recommendation is to address a condition that may result in an Increased Rate of In-Flight Shutdowns (IFSD), Take-Off Aborts (TOA), Air Turn Backs (ATB) or Diversions (DIV).
NOTE:
This Service Bulletin can only 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 operator's fleet.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
 To introduce new and reworked parts that improve reliability and reduce significant events.
(2)Condition:
The wear of the forward rail of the stage 10 OGV results in exposure of the piston ring and early removal of the engine.
(3)Cause:
The wear of the forward rail is the result of contact and excessive relative motion with the piston ring.
(4)Improvement:
 For the new stage 10 OGV P/N 2303M16G08, the change revises the forward rail by applying T800 wear resistant coating to the surface that is currently experiencing wear from the adjacent piston ring. This change will extend the time on-wing of the engine.
 For the new stage 10 OGVs P/N 2763M05G02, P/N 2763M05G03, and P/N 2763M05G04, the change introduces a repair that restores the forward rail to the original geometry with L605 material, providing an improved wear couple.
 For the new stage 10 OGVs P/N 2763M05G05, P/N 2763M05G06, and P/N 2763M05G07, the change introduces a repair that restores the forward rail to the original geometry with a T800 wear coating material, providing an improved wear couple. These changes will extend the time on-wing of the engine.
 The new reworked stage 10 OGVs included herein are made from the current fielded stage 10 OGVs P/N 2303M16G04, P/N 2303M16G06, and P/N 2303M16G07 and will improve the wear resistance of the rail over the original design.
(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
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 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
Repair Document (RD) 120-281 (L1 or higher), Combustor Assembly - Stage 10 Outlet Guide Vane - Alteration - Weld Repair of the Piston Ring Forward Rail
Repair Document (RD) 120-283 (L1 or higher), Combustor Assembly - Stage 10 Outlet Guide Vane - Alteration - Thermal Spray Buildup of the Piston Ring Forward Rail
  NOTE:
Get RDs from GE:
Fleet Support:
http://www.geaviation.com/support/
OR
E-mail (USA): aviation.fleetsupport@ge.com
E-mail (China & Asia): aviation.fleetsupport.cn@ge.com

OR
GE Aviation
M/D S171
One Neumann Way
Cincinnati, OH 45215
U.S.A.
  NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
CID: 575877, 575880, 575889
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
 Qualified interchangeability.
 The current fielded stage 10 OGV P/N 2303M16G04, P/N 2303M16G06, or P/N 2303M16G07 can be replaced with either a new stage 10 OGV P/N 2303M16G08 or a reworked stage 10 OGV P/N 2763M05G02, P/N 2763M05G03, P/N 2763M05G04, P/N 2763M05G05, P/N 2763M05G06, or P/N 2763M05G07. Reinstallation of the existing stage 10 OGV P/N 2303M16G04, P/N 2303M16G06, or P/N 2303M16G07 is not recommended.
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
 
2303M16G08
(1)
Vane, Stage 10 Outlet Guide
370,600.00
(1)
Quote
 NOTE:
Prices are provided for planning purposes and are subject to change.
(3)Consumables:
None.
B.Industry Support Information
Contact your Customer Support Manager (CSM).
C.Configuration Chart
 
New Part Number
Qty/ Eng
Part Name
Old Part Number/ IPC Location
Qty/ Eng
Op Code
Chg/ Sprt Code
 
(PRODUCTION)
 
2376M54G03/
G05/G07/G08
(X)
Combustor Diffuser Assembly
2376M54G03/
G05/G07/G08
(X)
RM
-/-
 
.2303M16G08
01-161J, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G07
01-161, 72-41-00
(1)
RE
5/A
 
(FIELD ONLY)
 
.2303M16G08
01-161J, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G07
01-161, 72-41-00
(1)
RE/RW
5/A
 
.2303M16G08
01-161J, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G06
01-161B, 72-41-00
(1)
RE
5/-
 
.2303M16G08
01-161J, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G04
01-161A, 72-41-00
(1)
RE
5/-
 
.2763M05G04
01-161E, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G07
01-161, 72-41-00
(1)
RW
5/A
 
.2763M05G02
01-161C, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G04
01-161A, 72-41-00
(1)
RW
5/-
 
.2763M05G03
01-161D, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G06
01-161B, 72-41-00
(1)
RW
5/-
 
.2763M05G05
01-161F, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G04
01-161A, 72-41-00
(1)
RW
5/-
 
.2763M05G06
01-161G, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G06
01-161B, 72-41-00
(1)
RW
5/-
 
.2763M05G07
01-161H, 72-41-00
(1)
Vane, Stage 10 Outlet Guide
(SIN 08001)
.2303M16G07
01-161, 72-41-00
(1)
RW
5/-
 Operation Codes
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.
D.Parts Disposition
 Replace or rework. Parts can either be replaced with a new or reworked stage 10 OGV to a new configuration as defined in paragraph 2.C., Configuration Chart.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Disassembly
(1)Disassemble the combustor diffuser assembly (diffuser) (Figure 1). Disassembly instructions have not changed. Refer to the GEnx-1B EM, 72-41-00, DISASSEMBLY 001, CONFIGURATION 02 and do as follows:
(a)Remove the stage 10 OGV assembly (Figure 1). Removal instructions have not changed. Refer to GEnx-1B EM, 72-41-00, DISASSEMBLY 001, CONFIGURATION 02, Subtask 72-41-00-040-055.
B.Inspection
(1)Do a visual inspection of the stage 10 OGV (Figure 1) at piece-part level, for forward rail wear all around. Refer to the GEnx-1B CIR, 72-41-20, INSPECTION 001, Subtask 72-41-20-220-085 and do as follows:
 (a)If wear is identified, the stage 10 OGV (Figure 1) is not serviceable, then do as follows:
 1Replace the old stage 10 OGV with a new stage 10 OGV. Continue with paragraph 3.D., Assembly.
 OR
 2Rework the stage 10 OGV. Refer to the GEnx-1B CIR, 72-41-20, REPAIR 003 and paragraph 3.C., Rework.
 (b)Deleted.
C.Rework
 
Deleted
(1)Rework the stage 10 OGV (Figure 1) by buildup of the forward rail. Refer to RD 120-281 or RD 120-283 and do as follows:
(a)At the completion of the rework procedure, put a mark through the old part number and write the new part number as specified in the table that follows:
 
Existing Part Number
If RD 120-281,
New Part Number
If RD 120-283,
New Part Number
 
2303M16G04
2763M05G02
2763M05G05
 
2303M16G06
2763M05G03
2763M05G06
 
2303M16G07
2763M05G04
2763M05G07
D.Assembly
(1)Install the outer seal. Refer to the GEnx-1B EM, 72-41-00, ASSEMBLY 001, CONFIGURATION 02, Subtask 72-41-00-044-182.
 (2)Install the compressor discharge pressure (CDP) shear bolts into the flange of the new or reworked stage 10 OGV (Figure 1). Refer to the GEnx-1B EM, 72-41-00, ASSEMBLY 001, CONFIGURATION 02, Subtask 72-41-00-044-183.
(3)Install the piston rings onto the stage 10 OGV (Figure 1). Refer to the GEnx-1B EM, 72-41-00, ASSEMBLY 001, CONFIGURATION 02, Subtask 72-41-00-440-184.
(4)Install the reworked stage 10 OGV (Figure 1). Refer to the GEnx-1B EM, 72-41-00, ASSEMBLY 001, CONFIGURATION 02, Subtask 72-41-00-440-187 or Subtask 72-41-00-440-188.
Stage 10 OGV Location
Figure 1