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Copyright (2017) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION
REVISION 1 TO SERVICE BULLETIN 73-0043
Revision 1 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS.
The original was issued April 15, 2015. Revision bars in the left margin identify changes.
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, -1B76A/P2
This Service Bulletin is applicable to all GEnx-1B engines.
The pressure sensor VIN 508486-1 (P/N 2125M60P01) is affected by this Service Bulletin.
B.Description
 This Service Bulletin introduces new pressure sensor VIN 516983-1 (P/N 2621M76P01) for the main fuel oil heat exchanger location and as an alternate for the fuel filter and fuel pump strainer locations.
  NOTE:
The change code for the new pressure sensor VIN 516983-1 (P/N 2621M76P01) has been revised to one-way interchangeable based on field experience and a high failure rate of the old pressure sensor VIN 508486-1 (P/N 2125M60P01) installed at the main fuel oil heat exchanger.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's 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 accomplished on wing or in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts.
(2)Condition:
The original pressure sensor P/N 2125M60P01, introduced with the main fuel oil heat exchanger (GEnx-1B S/B 79-0018), was not robust for this location. The modified pressure sensor P/N 2638M05P01, was then released as a containment action (GEnx-1B S/B 73-0039).
(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 pressure sensor.
(4)Improvement:
The new pressure sensor incorporates pressure attenuators that are similar to the current pressure sensor P/N 2638M05P01, as well as an increase in the pressures sensor's static capability to 240 psid.
The attenuators address the fuel system high frequency (above 400 Hz) pressure pulsations and the increased delta pressure capability (240 psid static), this ensures that the design will withstand any low frequency pressure spikes.
(5)Substantiation:
Substantiation is by 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 pressure sensor, 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 9250, Commercial Engine Standard Practices Manual (SPM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
GEK 114026, GEnx-1B Component Maintenance Manual (CMM), 73-32-01
GEnx-1B Boeing 787 Aircraft Maintenance Manual (AMM)
GEnx-1B S/B 73-0039, ENGINE FUEL AND CONTROL - General (73-00-00) - Introduction of Alternate Pressure Sensor
GEnx-1B S/B 79-0018, OIL - Fuel/Oil Heat Exchanger (79-21-00) - Improved Main Fuel/Oil Heat Exchanger with Indicating Capability
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
 
CID: 575361
 
BPP: 14-73-00-11
J.Publications Affected
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
GEK 114026, GEnx-1B Component Maintenance Manual (CMM), 73-32-01
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
 
VIN 516983-1*
(2621M76P01)
(1)
Sensor, Pressure
NP
(-)
--
 
J221P017
(1)
Packing, Preformed
0.87
(1)
5
 
J1441P020
(2)
Packing, Retainer
30.00
(10)
5
 
J228P020
(1)
Packing, Preformed
11.75
(5)
5
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:
Unison Industries Inc.
7575 Baymeadows Way
Jacksonville, FL 32256-8514
U.S.A.
 
OR
 
Customers (non-direct) are invited to contact the AAR CORP. representative at:
 
E-mail: unison.distribution@aarcorp.com
 
Phone: +1 800-422-2213
(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, IL 61125-7001 U.S.A.
(3)Consumables:
WARNING:
REFER TO THE PRODUCT LABEL AND THE MANUFACTURERS (MATERIAL) SAFETY DATA SHEET (SDS) FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING AND PROPER USE OF THIS PRODUCT.
 
Code Number
Description
 
C02-019
Oil, Engine Lubricating
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
(X)
Accessory Gearbox Module Assembly
2305M70G04/ G05/G06/G07/ G08
(X)
RM
-/-
 
.VIN 516983-1
(2621M76P01)
50-080B, 73-21-65
(1)
Sensor, Pressure
(SIN 31502)
.VIN 508486-1
(2125M60P01)
50-080, 73-21-65
(1)
RE
1/E
 
.2638M05P01
S/B 73-0039
(ALT)
Sensor, Pressure
(SIN 31502)
.2638M05P01
S/B 73-0039
(ALT)
RM
-/-
 
(FIELD ONLY)
 
2305M70G04/ G05/G06/G07/ G08
(X)
Accessory Gearbox Module Assembly
2305M70G04/ G05/G06/G07/ G08
(X)
RM
-/-
 
.VIN 508486-1
(2125M60P01)
01-010, 73-31-10
(1)
Sensor, Pressure
(SIN 31500)
.VIN 508486-1
(2125M60P01)
01-010, 73-31-10
(1)
RM
-/-
 
.2638M05P01
01-010A, 73-31-10
(ALT)
Sensor, Pressure
(SIN 31500)
--
(-)
AD
5/-
 
.VIN 516983-1
(2621M76P01)
01-010B, 73-31-10
(ALT)
Sensor, Pressure
(SIN 31500)
--
(-)
AD
5/-
 
.VIN 508486-1
(2125M60P01)
01-020, 73-31-10
(1)
Sensor, Pressure
(SIN 31501)
.VIN 508486-1
(2125M60P01)
01-020, 73-31-10
(1)
RM
-/-
 
.2638M05P01
01-020A, 73-31-10
(ALT)
Sensor, Pressure
(SIN 31501)
--
(-)
AD
5/-
 
.VIN 516983-1
(2621M76P01)
01-020B, 73-31-10
(ALT)
Sensor, Pressure
(SIN 31501)
--
(-)
AD
5/-
 
Operation Codes
AD=Add
RE=Replace
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.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
 (1)Remove and replace the pressure sensor (Figure 1). Refer to the GEnx-1B Boeing 787 AMM, G73-11-14, Removal, DMC-B787-A-G73-11-14-00A-520A-A and Installation, DMC-B787-A-G73-11-14-00A-720A-A.
Pressure Sensor Location
Figure 1