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Copyright (2020) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION
REVISION 3 TO SERVICE BULLETIN 72-0018
Revision 3 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS.
Revision 2 was issued April 23, 2012. Revision 1 was issued January 27, 2012. The original was issued May 27, 2011. Revision bars in the left margin identify changes.
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 956-135 and up.
These serial numbers are the best available data.
The old A/O extension duct (extension duct) P/N 2331M25G03 is affected by this Service Bulletin.
B.Description
This Service Bulletin releases a new extension duct P/N 2332M85P01 that includes features to reduce assembly damage and removes features to reduce oil retention.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's option.
NOTE:
This Service Bulletin can be accomplished in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To improve reliability and improve maintainability.
(2)Condition:
The outer tab of the extension duct has been frequently damaged at assembly. Oil retention has been observed in the extension duct after engine shutdown.
(3)Cause:
The extension duct outer tab is difficult to align with the low pressure turbine (LPT) cone shaft slot at assembly, because the forward lead-in can make contact with the mid fan shaft before the outer tab can make contact with the LPT cone shaft. The extension duct inner tab creates a damming feature in the flowpath, this prevents the oil to drain at engine shutdown.
(4)Improvement:
The outer tab of the extension duct has an increased length to make sure the outer tab makes contact with the LPT cone shaft before the forward lead-in makes contact with the mid fan shaft. The forward lead-in chamfer angle has been reduced and the inner tab on the inner flowpath removed.
(5)Substantiation:
Substantiation is by comparative 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
An estimate of the labor cost to accomplish this Service Bulletin may be obtained from any GEnx-1B GEAE authorized Service or Overhaul facility upon request.
H.Weight and Balance
The complete compliance with this Service Bulletin increases weight by 0.18 lb (0.080 kg).
I.References (Use the latest version of these documents)
 GEK 9250, Commercial Engine Standard Practices Manual (SPM)
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
NOTE:
The reference document listed below is for the engine manufacturer's internal use only:
 
CID: 942551
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
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
 
2332M85P01
(1)
Duct, A/O Extension
Quote
(-)
Quote
 
2331M27P01
(1)
Seal Assembly
Quote
(-)
Quote
 
J1437P010
(1)
Packing, Preformed
190.50
(1)
5
 
2331M87P01
(1)
Packing, Preformed
546.00
(1)
5
 
J1437P013
(1)
Packing, Preformed
354.25
(1)
5
 
J1438P177
(1)
Packing
71.00
(1)
5
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
None.
(3)Consumables:
 
Code Number
Description
 
C02-019
Oil, Engine Lubricating (engine oil)
 
C02-023
Oil, Engine Lubricating (engine oil)
 
C05-003
Marking Pens (marking pen)
 
C10-021
Tape, Plastic (tape)
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
(X)
Propulsor Module Assembly
2376M20G05
(X)
RM
-/-
 
.2332M85P01
45-270A, 72-00-02
(1)
Duct, A/O Extension
.2331M25G03
45-270, 72-00-02
(1)
RE
2/B
Operation Codes
RM=Remains
RE=Replace
Change Code
2=Two-way interchangeable.
Support Code
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
 
Tool Number
Description
 
11C3328G02
Tool Set, Install/Remove - No. 5 Bearing Aft Seal & Air Oil External (install/remove tool)
 
11C4662G01
Fixture, Guide - A/O External Duct, Horizontal (horizontal guide fixture)
 
Description
Manufacturer
 
Pump, Hand - Hydraulic (Capacity: 20 Ton) (hydraulic hand pump)
Local Purchase
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
(1)Remove the LPT module assembly and the mid fan shaft assembly from the propulsor module assembly. Refer to the GEnx-1B EM, 72-00-04, REMOVAL 001.
 (2)Deleted.
(3)Remove the old extension duct (1, Figure 1). Refer to the GEnx-1B EM, 72-00-04, DISASSEMBLY 001, Subtask 72-00-04-030-027.
 (4)Prepare the new extension duct (1, Figure 1) for installation. Refer to the GEnx-1B EM, 72-00-04, ASSEMBLY 001, CONFIG 01, Subtask 72-00-04-430-116 or CONFIG 02, Subtask 72-00-04-430-162.
 (5)Install the new extension duct (1, Figure 1). Refer to the GEnx-1B EM, 72-00-04, ASSEMBLY 001, CONFIG 01, Subtask 72-00-04-430-119 or CONFIG 02, Subtask 72-00-04-430-164.
 (6)Do a seating check of the extension duct (1, Figure 1). Refer to the GEnx-1B EM, 72-00-04, ASSEMBLY 001, CONFIG 01, Subtask 72-00-04-220-032 or CONFIG 02, Subtask 72-00-04-220-034.
(7)Install the LPT module assembly and the mid fan shaft assembly to the propulsor module assembly. Refer to the GEnx-1B EM, 72-00-04, INSTALLATION 001.
Extension Duct
Figure 1  
Deleted
Figure 2  
Deleted
Figure 3  
Deleted
Figure 4