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Copyright (2013) General Electric Company, U.S.A.
1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B58, -1B64, -1B67, -1B70, -1B54/P1, -1B58/P1, -1B64/P1, -1B67/P1, -1B70/P1, -1B70/72/P1, -1B70/75/P1, -1B74/75/P1, -1B75/P1, -1B54/P2, -1B58/P2, -1B64/P2, -1B67/P2, -1B70/P2, -1B70/72/P2, -1B70/75/P2, -1B74/75/P2, -1B75/P2, -1B78/P2
This Service Bulletin is applicable to all GEnx-1B engines.
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-285 and up.
The high pressure turbine (HPT) rotor sump seal (seal) P/N 2305M99P01 is affected by this Service Bulletin.
B.Description
This Service Bulletin introduces a new damper sleeve (damper) P/N 2546M45P01 and a redesigned seal P/N 2305M99P02 to replace the current seal P/N 2305M99P01.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience.
NOTE:
This Service Bulletin can be accomplished in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts and improve durability.
(2)Condition:
Analysis of the current seal shows the potential for a heavy seal rub to occur.
(3)Cause:
An adverse assembly condition can lead to a thermal instability in the seal with the potential for a heavy seal rub to occur.
(4)Improvement:
The new seal design incorporates a damper and has an improved thermal stability. This accommodates any adverse assembly condition and makes the seal robust to rotor/stator rub interactions.
(5)Substantiation:
Substantiation is by 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
No additional man-hours are required to comply with this Service Bulletin.
H.Weight and Balance
The complete compliance with this Service Bulletin increases weight by 0.10 lb (0.05 kg).
I.References (Use the latest version of these documents)
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 documents listed below are for the engine manufacturer's internal use only:
 
CID: 573759
 
BPP: 11-72-53-06
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
The new seal and damper must be incorporated at the same time. As a complete engine set the superseded seal is interchangeable with the proposed seal and damper.
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
 
2305M99P02
(1)
Seal, HPT Rotor Sump
10,250.00
(1)
Quote
 
2546M45P01
(1)
Damper
486.00
(1)
30
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
-/-
 
.2305M99P02
35-450A, 72-00-02
(1)
Seal, HPT Rotor Sump
(SIN 01401)
.2305M99P01
35-450, 72-00-02
(1)
RE
5/B
 
.2546M45P01
35-455, 72-00-02
(1)
Sleeve, Damper
(SIN 01492)
--
(-)
AD
5/-
Operation Codes
AD=Add
RE=Replace
RM=Remains
Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
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
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal
(1)Removal instructions for the seal (1, Figure 1) have not changed. Refer to GEnx-1B EM, 72-50-00, DISASSEMBLY 001.
B.Assembly
(1)Installation instructions for the seal (1, Figure 1) have not changed. Refer to GEnx-1B EM, 72-50-00, ASSEMBLY 001, except as follows:
(a)Install a damper (2, Figure 1) with the new seal (1) before assembly.
(b)Do an inspection for axial positioning of the damper (2) to make sure that it is seated against the seal ID.
Introduction of New Damper and Redesigned Seal
Figure 1