TRANSMITTAL INFORMATION
REVISION 1 TO SERVICE BULLETIN 72-0068
Revision 1 is issued to change from limited distribution to full release of the GEnx-1B definition, 1.A., Effectivity, 1.B., Description, 1.E., Reason
, 1.K., Interchangeability
, 2.A., Material - Price and Availability, and 2.C., Configuration Chart
. The original was issued January 26, 2012. 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 956-104, 956-105, 956-106, 956-140, and 956-141.
These serial numbers are the best available data.
The combustor case P/N 2303M23G11 is affected by this Service Bulletin.
B.Description
This Service Bulletin provides a new combustor case P/N 2303M23G19 and associated hardware to the engine illustrated parts catalog (EIPC).
 This combustion case is the same as the production P/N 2303M23G11 except for the addition of an access pad to permit installation of an instrumentation rake for flight test use. For production use the instrumentation pad is covered with a blank-off plate.
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
 
LIFE LIMIT
 
The life limit for the new combustion case P/N 2303M23G19 has been added to the GEnx-1B Engine Manual (EM), Section 05-11-05 by Temporary Revision (TR) 05-0013. Refer to the GEnx-1B EM for cycle time limit of this part.
E.Reason
(1)Objective:
To introduce a new part.
(2)Condition:
 New combustor case P/N 2303M23G19 has been installed on 956-104, 956-105, 956-106, 956-140, and 956-141 engines. This case has a plane 3.1 rake pad and additional hardware required to seal the pad. The currently released combustor case P/N 2417M03G01 also has a plane 3.1 rake pad that uses the identical parts.
(3)Cause:
This combustor case supports GEnx-1B PIP1 engine testing program.
(4)Improvement:
The new combustor case allows to install the rake and acquire the plane 3.1 engine data.
(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
No additional man-hours are required to comply with this Service Bulletin.
H.Weight and Balance
Weight and balance are not changed.
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)
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
 
CID: 573287
 
BPP: 07-72-40-06.A
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
All parts listed in this Service Bulletin have to be installed as a set.
 The case P/N 2303M23G19 is the same as P/N 2303M23G11 except for the addition of a plane 3.1 rake pad. The G19 can be used in any engine that allows the G11 if the blank-off plate, gasket, and assembly bolts are included as a set to seal the rake pad on the G19. The engine serial numbers 956-104, 956-105, 956-106, 956-140, and 956-141 are production engines with shipped G19 cases installed. The G11 can be installed in the five engines already mentioned. The G19 can be installed in engines qualified with the G11 case with no restrictions.
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
 
2376M45G04
(1)
Combustor Nozzle Diffuser Assembly
Quote
(-)
Quote
 
2376M54G04
(1)
Combustor Diffuser Assembly
Quote
(-)
Quote
 
2303M23G19
(1)
Case, Combustor
Quote
(-)
Quote
 
2379M23G01
(1)
Bracket
Quote
(-)
Quote
 
2327M65P01
(1)
Plug, Cover
Quote
(-)
Quote
 
J644P10B
(4)
Bolt, Machine
Quote
(-)
Quote
 
2327M62P01
(1)
Gasket, Rake
Quote
(-)
Quote
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
 
(ESNs 956-104, 956-105, 956-106, 956-140, and 956-141)
 
2376M20G06/G07
(X)
Base Propulsor Module Assembly
2376M20G06/G07
(X)
RM
-/-
 
.2376M45G04
33-019, 72-00-02
(1)
Combustor Nozzle Diffuser Assembly (SIN 0010A)
--
(1)
AD
5/-
 
..2376M54G04
01-089, 72-40-00
(1)
Combustor Diffuser Assembly (SIN 12000)
--
(1)
AD
5/-
 
...2303M23G19
01-079, 72-41-00
(1)
Case, Combustor (SIN 12001)
--
(1)
AD
5/-
 
...2379M23G01
01-229, 73-11-30
(1)
Bracket
(SIN 61112)
--
(1)
AD
5/-
 
...2327M65P01
01-205, 72-41-00
(1)
Plug, Cover (SIN 65N01)
--
(-)
AD
5/-
 
...J644P10B
01-210, 72-41-00
(4)
Bolt, Machine (SIN 65N20)
--
(-)
AD
5/-
 
...2327M62P01
01-215, 72-41-00
(1)
Gasket, Rake (SIN 65N50)
--
(-)
AD
5/-
 
Operation Codes
AD=Add
RM=Remains
Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Code None.
D.Parts Disposition
Use serviceable old parts for engines that have not changed.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Disassembly
(1)Disassembly instructions for the combustor case have not changed. Refer to the GEnx-1B EM, 72-41-00, DISASSEMBLY 001.
B.Assembly
(1)Assembly instructions for the combustor case have not changed. Refer to the GEnx-1B, 72-41-00, ASSEMBLY 001.
(2)Install the cover plug (1, Figure 1) as follows:
(a)Install the cover plug (1) and the rake gasket (3) on the combustor case (01-080, 72-41-00) with four bolts (2).
(b)Torque the bolts (2) in a criss cross pattern to 106-124 lb in. (12.0-14.0 Nm).
Installation of Cover Plug on the Combustor Case
Figure 1