1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B58, -1B64, -1B67, -1B70
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-160 and up.
These serial numbers are the best available data.
The machine bolts P/N AS3238-18, P/N MS9556-06, and P/N MS9556-08 are affected by this Service Bulletin.
B.Description
This Service Bulletin introduces a new accessory gearbox (AGB) machine bolt P/N MS9556-05, and propulsor module assembly machine bolt P/N MS9556-06. Also provides a new requirement to lubricate the lube and scavenge pump machine bolt P/N AS3237-12.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience.
NOTE:
This Service Bulletin can be accomplished in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts, improve reliability, and improve maintainability.
(2)Condition:
The machine bolts, used to install the main fuel line to the fuel pump, cause damage to the insert.
The machine bolts around the AGB at worse case stack-up condition do not comply with the minimum clearance with the AGB.
Installation of the AGB machine bolts is difficult.
(3)Cause:
The unthreaded shank interferes with the insert threads. Shorter machine bolts will eliminate this issue.
The machine bolts affect the minimum clearance with the AGB.
Lack of lubrication on the AGB machine bolts.
(4)Improvement:
The new machine bolts eliminate a possible thread insert interference and the lubricant improves machine bolt assembly and disassembly.
(5)Substantiation:
Substantiation is by 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)
GEnx-1B Boeing 787 Aircraft Maintenance Manual (AMM)
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
 
CID: 573276, 573491
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
GEnx-1B Boeing 787 Aircraft Maintenance Manual (AMM)
K.Interchangeability
One-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
 
MS9556-05*
(4)
Bolt, Machine
NP
(-)
--
 
MS9556-06*
(1)
Bolt, Machine
NP
(-)
--
 
NP= Not Provisioned
 
*Part not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase.
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
None.
(3)Consumables:
 
Code Number
Description
 
C02-023
Oil, Engine Lubricating (engine oil) (MIL-PRF-23699)
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
 
2305M70G04
(X)
Accessory Gearbox Module Assembly
2305M70G04
(X)
RM
-/-
 
--
(-)
Bolt, Machine (SIN 44A20)
.MS9556-06
35-015, 79-22-10
(1)
DE
1/E
 
--
(-)
Bolt, Machine (SIN 44B20)
.MS9556-06
35-125, 79-22-10
(3)
DE
1/E
 
.MS9556-05
35-015A, 79-22-10
(1)
Bolt, Machine (SIN 44A29)
--
(-)
AD
5/-
 
.MS9556-05
35-125A, 79-22-10
(3)
Bolt, Machine (SIN 44B29)
--
(-)
AD
5/-
 
2376M20G05
(X)
Propulsor Module Assembly
2376M20G05
(X)
RM
-/-
 
.MS9556-0825-050A, 73-11-43
(12)
Bolt, Machine (SIN 59020)
.MS9556-0825-050, 73-11-43
(13)
QTC
5/E
 
.MS9556-0625-055, 73-11-43
(1)
Bolt, Machine (SIN 59024)
--
(-)
AD
5/-
Operation Codes
AD=Add
DE=Delete
QTC=Quantity Change RM=Remains
Change Codes 1=One-way interchangeable.
5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Code 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.
Use serviceable old parts for engines that have not changed.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.AGB Machine Bolts Replacement
(1)Remove the machine bolts (1 and 2, Figure 1) from support bracket (01-270, 72-00-05) and support bracket (01-280). Refer to GEnx-1B EM, 72-00-05, DISASSEMBLY 001.
(2)Install the new machine bolts (1 and 2, Figure 1). Refer to GEnx-1B EM, 72-00-05, ASSEMBLY 001.
B.Propulsor Module Assembly Machine Bolts Replacement
(1)Remove the machine bolt (1, Figure 2) that attaches the drain tube (25-040, 73-11-43) to the support bracket (01-170, 72-00-05). Refer to GEnx-1B EM, 72-00-02, DISASSEMBLY 002.
(2)Install the new machine bolt (1, Figure 2). Torque the new machine bolt (1) to 51-59 lb in. (5.8-6.7 Nm). Refer to GEnx-1B EM, 72-00-02, ASSEMBLY 005.
C.Lube and Scavenge Pump Machine Bolt Lubrication Change
NOTE:
These instructions are intended as advance information for shop planning purposes.
(1)The removal and installation instructions for the machine bolts (1, Figure 3) have not changed, however, a new lubrication process is used. Refer to GEnx-1B EM, 72-00-05, INSTALLATION 001, and do as follows:
WARNING:
DO NOT LET LUBRICATING OIL STAY ON YOUR SKIN. DO NOT BREATHE THE FUMES RELEASED FROM LUBRICATING OIL FOR A LONG TIME. LUBRICATING OIL IS DANGEROUS TO YOUR EYES, NOSE, AND LUNGS.
(a)Apply C02-023 engine oil to the threads and friction surfaces of the machine bolts (1, Figure 3).
AGB Machine Bolts
Figure 1  
Propulsor Module Assembly Machine Bolt
Figure 2  
Lube and Scavenge Pump Machine Bolts
Figure 3