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Copyright (2016) 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, -1B74/75/P1, -1B74/75/P2
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-667 and up.
These serial numbers are the best available data.
The tube P/N 2550M88G01 and booster anti-ice (BAI) air tube P/N 2437M62G01 are affected by this Service Bulletin.
B.Description
This Service Bulletin releases a new anti-ice air tube (tube) P/N 2681M63G01 and installation instructions.
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 a new part and reduce weight.
(2)Condition:
The current BAI configuration of two tubes has no immediate negative impact on the engine except for an extra weight of 0.477 lb (0.216 kg).
(3)Cause:
Two tubes were added for maintainability at early stages of the engine development.
(4)Improvement:
The new BAI system will combine both tubes in single one, which will result in a total weight reduction of 0.477 lb (0.216 kg) per engine.
(5)Substantiation:
Substantiation is by analysis and comparative analysis.
F.Approval
The data contained in 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
The complete compliance with this Service Bulletin decreases weight by 0.477 lb (0.216 kg).
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 S/B 72-0094, ENGINE - Propulsor Module Assembly (72-00-00) - Engine Anti Ice Brackets Combination
GEnx-1B S/B 72-0290, ENGINE - General (72-00-00) - Elimination of Oil Supply Temperature Sensor and CC Temperature Sensor
GEnx-1B S/B 75-0011, AIR - Nacelle Anti-Ice Valve (75-11-30) - Booster Anti-Ice Valve Improvement
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
 
CID: 575524
 
BPP: 15-75-00-40847
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
The old and new parts are interchangeable 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
 
2681M63G01
(1)
Anti-Ice Air Tube
11,130.00
(1)
5
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
 
2376M20G02/
G05/G06/G07/
G08/G09
(X)
Propulsor Module Assembly
2376M20G02/
G05/G06/G07/
G08/G09
(X)
RM
-/-
 
2447M20G01/
G02/G03
(X)
Propulsor Module Assembly
2447M20G01/
G02/G03
(X)
RM
-/-
 
2447M20G04
S/B 72-0290
(X)
Propulsor Module Assembly
2447M20G04
S/B 72-0290
(X)
RM
-/-
 
.2681M63G01
01-030C, 75-11-30
(1)
Tube
(Old Name)
Anti-Ice Air Tube
(New Name)
(SIN 63703)
.2550M88G01
01-030B, 75-11-30
(1)
RE
5/B
 
--
(-)
Tube, BAI Air
(SIN 63704)
.2437M62G01
01-180, 75-11-30
(1)
DE
5/B
 
--
(-)
Seal, Ring
(SIN 63750)
.AS1895/23-125
01-100, 75-11-30
(1)
DE
5/E
 
--
(-)
Clamp, Coupling
(SIN 63780)
.AS1895/4-125
01-110, 75-11-30
(1)
DE
5/E
Operation Codes
DE=Delete
RE=Replace
RM=Remains
Change Codes
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 on other locations.
D.Parts Disposition
Use serviceable old parts for engines that have not changed.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal
(1)Removal instructions for the tube (1, Figure 1) and BAI air tube (2) have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, CONFIG 01 or CONFIG 02.
B.Installation
(1)Installation instructions for the tube (1, Figure 1) have not changed, except the extension of the forward end of the new tube (1) is larger and hardware to assemble old tubes are not longer used. Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 005, CONFIG 01 or CONFIG 02.
Location of Booster Anti-Ice Duct
Figure 1   (Sheet 1)
Location of Booster Anti-Ice Duct
Figure 1   (Sheet 2)