1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B58, -1B64, -1B67, -1B70
This Service Bulletin is applicable to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-110 and up.
These serial numbers are the best available data.
The cushion loop clamp P/N J1432P05 is affected by this Service Bulletin.
B.Description
This Service Bulletin releases an improved cushion loop clamp to W34 and W35 harnesses with optimized retention features that provide adequate harnesses routing.
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 on wing or in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce a new part and improve maintainability.
(2)Condition:
The current cushion loop clamp size does not properly hold the harnesses.
(3)Cause:
The change of cushion loop clamp is because the cost and weight optimized harness reduced its diameter at the support location where the cushion loop clamp is located, but the cushion loop clamp size was not updated to meet the design intent.
(4)Improvement:
The new size of the cushion loop clamp provides better support of the harness to meet the routing clearance requirements.
(5)Substantiation:
Substantiation is by comparative analysis.
F.Approval
This Service Bulletin has been reviewed by the FAA and the repair(s) and modification(s) herein comply with the applicable Federal Aviation Regulations and are FAA 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 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
NOTE:
The reference document listed below is for the engine manufacturer's internal use only:
 
CID: 547507
J.Publications Affected
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
 
J1432P04
(2)
Clamp-Loop, Cushion
18.00
(1)
30
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
 
2305M15G03-G05
(X)
Assembly, Fan Stator Module
2305M15G03-G05
(X)
RM
-/-
 
.J1432P04
20-030A, 73-21-66
25-030A, 73-21-66
(2)
Clamp-Loop, Cushion
(SIN 68882)
.J1432P05
20-030, 73-21-66
25-030, 73-21-66
(2)
RE
2/B
Operation Codes
RE=Replace
RM=Remains
Change Code 2=Two-way interchangeable.
Support Code B=Old parts will be supplied until all old parts are sold.
D.Parts Disposition
Use serviceable old parts at other engine locations.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
(1)Removal and installation instructions for the cushion loop clamp have not changed. Refer to the GEnx-1B EM, 72-00-01, DISASSEMBLY 001 and ASSEMBLY 001.