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Copyright (2014) 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/P2
This Service Bulletin is applicable to all GEnx-1B engines.
B.Description
This Service Bulletin introduces a new alternative pressure sensor P/N 2638M05P01.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's option.
NOTE:
This Service Bulletin can be accomplished on wing.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts.
(2)Condition:
The current pressure sensor VIN 508486-1 (P/N 2125M60P01) is used in three areas within the GEnx engine: fuel filter, fuel pump strainer, and most recently, main fuel oil heat exchanger (refer to GEnx-1B S/B 79-0018). On certain engines, infant mortality failures of this sensor have been experienced at the main fuel oil heat exchanger location.
(3)Cause:
Higher than expected delta pressures (measured at the high side and low side of the heat exchanger bypass valve) may damage the sensing chip inside the sensor.
(4)Improvement:
The new part has incorporated pressure attenuators at each pressure port to reduce the peak pressure amplitudes that reach the sensor's sensing element (silicon chip).
(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
After you get access to the fuel delta pressure (DP) transducer, you will need approximately 0.5 man-hour for each engine or component.
H.Weight and Balance
Weight and balance are not changed.
I.References (Use the latest version of these documents)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
GEnx-1B S/B 79-0018, OIL - Fuel/Oil Heat Exchanger (79-21-00) - Improved Main Fuel/Oil Heat Exchanger with Indicating Capability
GEnx-1B Boeing 787 Aircraft Maintenance Manual (AMM)
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
 
CID: 575367
 
BPP: 14-73-00-11
J.Publications Affected
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
GEK 114026, GEnx Fuel Filter Differential Pressure Transducer Component Maintenance Manual (CMM)
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
 
2638M05P01
(ALT)
Sensor, Pressure
9,712.41
(1)
Quote
 
J221P017
(1)
Packing, Preformed
0.69
(25)
5
 
J1441P020
(2)
Packing, Retainer
24.75
(10)
5
 
J228P020
(1)
Packing, Preformed
9.50
(5)
5
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
 
Part Number
Qty/ Eng
Part Name
Unit ($) Price
Pkg Qty
Lead Time Days
 
1355-1349*
(1)
Packing, Preformed
NP
(-)
--
NP = Not Provisioned
NOTE:
Prices are provided for planning purposes and are subject to change.
*Part not supplied by GE Engine Services Distribution L.L.C. To procure parts, contact the following:
Woodward Governor Co. 5001 North Second Street
P.O. Box 7001 Rockford, Illinois 61125-7001
U.S.A.
(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
 
2305M70G04/ G05/G06/G07/ G08/G09
(X)
Accessory Gearbox Module Assembly
2305M70G04/ G05/G06/G07/ G08/G09
(X)
RM
-/-
 
.VIN 508486-1
(2125M60P01)
50-080, 73-21-65
(1)
Sensor, Pressure
(SIN 31502)
.VIN 508486-1
(2125M60P01)
50-080, 73-21-65
(1)
RM
-/-
 
.2638M05P01
50-080A, 73-21-65
(ALT)
Sensor, Pressure
(SIN 31502)
--
(-)
AD
5/-
 
Operation Codes
AD=Add
RM=Remains
Change Codes
5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
D.Parts Disposition
Use serviceable old parts at other engine locations.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
(1)Remove and replace the pressure sensor. Refer to the GEnx-1B Boeing 787 AMM, TASK B787-A-G73-11-14-00A-520A-A and TASK B787-A-G73-11-14-00A-720A-A.