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Copyright (2019) General Electric Company, U.S.A.
1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B64, -1B64/P1, -1B64/P2, -1B67, -1B67/P1, -1B67/P2, -1B70, -1B70/75/P1, -1B70/75/P2, -1B70/P1, -1B70/P2, -1B70C/P1, -1B70C/P2, -1B74/75/P1, -1B74/75/P2, -1B76/P2, -1B76A/P2
This Service Bulletin is applicable to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-101 through 958-418.
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 958-419 and up.
These serial numbers are the best available data.
The oil vent tube P/N 2320M98G01 is affected by this Service Bulletin.
B.Description
This Service Bulletin releases a new oil vent tube P/N 2772M48G01 with a longer protrusion at the flange to improve the installation of the affected oil vent tube during turbine center frame (TCF) assembly or maintenance.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience/option.
Impact E
This recommendation is to improve the cost of ownership, reduce maintenance requirements or is a product improvement.
NOTE:
This Service Bulletin can be done 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 configuration allows the machine bolts to be engaged with the nuts before the short flange protrusion is inserted. This caused the joint to be pulled together and the protrusion indents the TCF assembly strut face.
(3)Cause:
The longer protrusion helps the installation between oil vent tubes and the TCF assembly strut oil vent tubes, by avoiding damage of the joint assembly caused by improper installation.
(4)Improvement:
The new configuration will limit the engagement of the machine bolts until the large flange protrusion is inserted into the matting strut oil vent tube hole.
(5)Substantiation:
Substantiation is by comparative analysis and 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)
GEnx-1B, Boeing 787 Aircraft Maintenance Manual (AMM)
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: 551428
BPP: 18-29-00-77083
J.Publications Affected
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
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
 
2772M48G01
(1)
Oil Vent Tube
3,635.00
(1)
Quote
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
 
2376M20G05/
G06/G07/G08/
G09
(X)
Propulsor Module Assembly
2376M20G05/
G06/G07/G08/
G09
(X)
RM
-/-
 
2447M20G01/
G02/G03/G04/
G05
(X)
Propulsor Module Assembly
2447M20G01/
G02/G03/G04/
G05
(X)
RM
-/-
 
.2772M48G01
05-150A, 79-22-30
(1)
Tube, Oil Vent
(SIN 46102)
.2320M98G01
05-150, 79-22-30
(1)
RE
1/B
Operation Codes
RE=Replace
RM=Remains
Change Codes
1=One-way interchangeable.
Support Codes
B=Old parts will be supplied until all old parts are sold.
D.Parts Disposition
Use serviceable old parts for engines that have not changed.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.On-Wing Instructions
(1)Removal and installation instructions of the oil vent tube (1, Figure 1) have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, CONFIG 01, Subtask 72-00-02-030-540 or DISASSEMBLY 002, CONFIG 02, Subtask 72-00-02-030-565 and GEnx-1B EM, 72-00-02, ASSEMBLY 005, CONFIG 01, Subtask 72-00-02-440-187 or CONFIG 02, Subtask 72-00-02-440-356.
B.In-Shop Instructions
(1)Removal and installation instructions of the oil vent tube (1, Figure 1) have not changed. Refer to the GEnx-1B, Boeing 787 AMM, DMC-B787-A-G79-21-08-00A-520A-A and DMC-B787-A-G79-21-08-00A-720A-A.
Installation of the Oil Vent Tube
Figure 1   (Sheet 1)
Installation of the Oil Vent Tube
Figure 1   (Sheet 2)