1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B54/P1, -1B58, -1B58/P1, -1B64, -1B64/P1, -1B67, -1B67/P1, -1B70, -1B70/P1, -1B70/72/P1, -1B70/75/P1, -1B74/75/P1, -1B75/P1
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-186 and up.
These serial numbers are the best available data.
The seal ring P/N 1847M57P01, loop clamp P/N MS9025-10, seal retainer P/N 2327M99G01, seal retainer P/N 2379M75G01, and machine bolt P/N AS3237-12 are affected by this Service Bulletin.
B.Description
This Service Bulletin provides an update for the GEnx-1B propulsor assembly configuration.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience or option.
NOTE:
This Service Bulletin can be accomplished in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts.
To properly update the GEnx-1B propulsor assembly configuration.
(2)Condition:
Some of the GEnx-1B configuration updates were not made to some modules groups.
(3)Cause:
The affected group does not contain the current GEnx configuration.
(4)Improvement:
This Service Bulletin updates P/N 2376M20 module groups to properly reflect the GEnx-1B configuration.
(5)Substantiation:
Substantiation is by analysis and test.
F.Approval
This Service Bulletin has been reviewed by the appropriate governmental authority 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 this document)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
NOTE:
The reference document listed below is for the engine manufacturer's internal use only:
 
CID: 573489
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
Qualified interchangeability: The quantity of the seal retainer SIN 62010 and cushion loop clamp SIN 52180 is changing.
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
 
2327M99G01
(1)
Seal Retainer
714.00
(1)
Quote
 
AS3237-08*
(2)
Machine Bolt
NP
(-)
--
 
1847M57P01
(AR)
Ring Seal
1,406.00
(1)
5
* Part not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase.
NP= Not Provisioned
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
 
2376M20G01-G03
(X)
Propulsor Module Assembly
2376M20G01-G03
(X)
RM
-/-
 
2376M20G05-G08
(X)
Propulsor Module Assembly
2376M20G05-G08
(X)
RM
-/-
 
.1847M57P01
34-290, 72-00-02
(AR)
Seal, Ring
(SIN 150N4)
.1847M57P01
34-290, 72-00-02
(1)
QTC
2/-
 
.2327M99G01
01-070A, 75-23-10
(10)
Retainer, Seal
(SIN 62010)
.2327M99G01
01-070, 75-23-10
(9)
QTC
5/-
 
--
(-)
Retainer, Seal
(SIN 62011)
.2379M75G01
01-200, 75-23-10
(1)
DE
5/B
 
2376M20G07-G08
(X)
Propulsor Module Assembly
2376M20G07-G08
(X)
RM
-/-
 
..MS9025-10
SB 79-0014
(18)
Clamp, Loop Cushion
(SIN 52180)
.MS9025-10
30-140, 79-22-10
(13)
QTC
5/E
 
2376M20G06-G08
(X)
Propulsor Module Assembly
2376M20G06-G08
(X)
RM
-/-
 
.AS3237-08
65-160A, 72-00-02
(2)
Bolt, Machine
(SIN 68025)
.AS3237-12
65-160, 72-00-02
(2)
RE
2/E
Operation Codes
DE=Delete
RE=Replace
RM=Remains
QTC=Quantity Change
Change Codes 2=Two-way interchangeable.
5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Codes B=Old parts will be supplied until all old parts are sold. E=Old parts will be supplied, and can be used at other engine locations.
D.Parts Disposition
Use serviceable old parts at other engine locations.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal
(1)Remove the seal retainers (01-070, 75-23-10), seal retainer (01-200), and bulb seals (01-060) from the VBV air ducts. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, Subtask 72-00-02-040-138, except as follows:
(a)Remove the seal retainer (01-200) and bulb seal (01-060) from the VBV air duct (01-180) at the 5:00 o'clock position. Discard the seal retainer.
(2)Removal instructions of the bolts (65-160, 72-00-02), have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 001, Subtask 72-00-02-030-438.
(3)Remove the cushion loop clamps (30-140, 79-22-10), refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, Subtask 72-00-02-030-417.
B.Assembly
(1)Install the seal retainers on the VBV air ducts. Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 004, Subtask 72-00-02-440-130, except as follows:
(a)Replace seal retainer (01-200) with the seal retainer (1, Figure 1) on the VBV air duct (01-180) at the 5:00 o'clock position on the fan hub frame (01-490, 72-26-00).
(2)Installation instructions of the bolts (65-160, 72-00-02), have not changed. Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 006, Subtask 72-00-02-430-767.
(3)Install the cushion loop clamps (30-140A, 79-22-10), refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 005, Subtask 72-00-02-440-184.
Installation of the VBV Air Duct
Figure 1   (Sheet 1)
Installation of the VBV Air Duct
Figure 1   (Sheet 2)