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Copyright (2016) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION
REVISION 1 TO SERVICE BULLETIN 72-0057
Revision 1 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS.
The original was issued December 09, 2011. Revision bars in the left margin identify changes.
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 hinged block clamp P/N ER3752P01 and the machine bolt P/N AS3237-08 are affected by this Service Bulletin.
B.Description
 This Service Bulletin introduces a new bracket P/N ER6319G01, machine bolts P/N MS9556-08, cushioned clamps P/N J1220G21, and cushioned loop clamp P/N J1432P12.
C.Compliance
 Category 7
 GE recommends that you do this Service Bulletin at customer's convenience/option.
NOTE:
This Service Bulletin can be accomplished on wing.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts and improve maintainability.
(2)Condition:
The hinged block clamp P/N ER3752P01 that attaches the hydraulic supply hose tube and the hydraulic case drain hose tube (hydraulic case tube) tends to move from its original position. The hinged block clamp P/N ER3752P01 tends to move up toward the interface at the strut hanger. This movement could cause that the hydraulic supply hose tube and the hydraulic case tube make contact.
(3)Cause:
The current hinged block clamp P/N ER3752P01 does not have a good retention feature, which allows the movement upwards.
(4)Improvement:
The new design incorporates two cushioned clamps on the hydraulic supply hose tube and a cushioned loop clamp on the hydraulic case tube, all of them attached to a bracket. This bracket has anti-rotation features for two of the three clamps to insure proper orientation of the hose assemblies.
(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 documents listed below are for the engine manufacturer's internal use only:
 
CID: 573201
 
BPP: 11-29-00-02
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
The new hardware must be introduced as a set.
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
 
ER6319G01**
(1)
Bracket
NP
(-)
--
 
MS9556-08*
(3)
Bolt, Machine
NP
(-)
--
 
J1220G21**
(2)
Clamp, Cushioned
NP
(-)
--
 
J1432P12**
(1)
Clamp, Cushioned Loop
NP
(-)
--
 *Parts not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase.
 ** Parts not supplied by GE Engine Services Distribution L.L.C. Procure from: CAGE 81205.
 V81205 The Boeing Company Boeing Defense, Space, and Security 7755 East Marginal Way South Seattle, WA 98124-4002 U.S.A
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
 
738L103G01
(X)
Kit, EBU Fd
738L103G01
(X)
RM
-/-
 
.ER6319G01
05-370, 71-00-00
(1)
Bracket
(SIN 53013)
--
(-)
AD
5/-
 
.MS9556-08
05-101, 71-00-00
(3)
Bolt, Machine
(SIN 53021)
.AS3237-08
05-100, 71-00-00
(1)
RE
5/E
 
--
(-)
Clamp, Hinged Block
(SIN 53081)
.ER3752P01
05-090, 71-00-00
(1)
DE
5/A
 
.J1220G21
05-390, 71-00-00
(2)
Clamp, Cushioned
(SIN 53082)
--
(-)
AD
5/-
 
.J1432P12
05-400, 71-00-00
(1)
Clamp, Cushioned Loop
(SIN 53281)
--
(-)
AD
5/-
Operation Codes
AD=Add
DE=Delete
RE=Replace
RM=Remains
Change Code
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
None.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal
(1)Removal instructions for the machine bolt (1, Figure 1) and hinged block clamp (05-090) have not changed. Refer to the GEnx-1B EM, 72-00-00, DISASSEMBLY 001.
B.Installation
 (1)Install the bracket (3, Figure 1), machine bolts (1), cushioned clamps (2), and cushioned loop clamp (4). Refer to the GEnx-1B EM, 72-00-00, ASSEMBLY 001, Subtask 72-00-00-400-013.
New Hardware for Hydraulic Supply Line
Figure 1