GE PROPRIETARY INFORMATION
The information contained in this document is GE proprietary information and is disclosed in confidence. It is the property of GE and shall not be used, disclosed to others or reproduced without the express written consent of GE, including, but without limitation, it is not to be used in the creation, manufacture, development, or derivation of any repairs, modifications, spare parts, designs, or configuration changes or to obtain FAA or any other government or regulatory approval to do so. If consent is given for reproduction in whole or in part, this notice and the notice set forth on each page of this document shall appear in any such reproduction in whole or in part.
This technical data is considered EAR controlled pursuant to 15 CFR Parts 730-774 respectively. Transfer of this data by any means to a Non-US Person, whether in the United States or abroad, without the proper U.S. Government authorization (e.g., License, exemption, NLR, etc.), is strictly prohibited.
Copyright (2014) General Electric Company, U.S.A.
1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B58, -1B64, -1B67, -1B70
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 956-102 thru 956-106 and 956-108 and up.
These serial numbers are the best available data.
The upper firewall P/N 2360M42G03 and lower firewall P/N 2311M29G03 are affected by this Service Bulletin.
B.Description
This Service Bulletin provides instructions to rework the current upper and lower firewalls into the new upper firewall P/N 2360M42G04 and new lower firewall P/N 2311M29G04.
C.Compliance
Category 9
Information only.
NOTE:
This Service Bulletin can be accomplished in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To rework parts.
(2)Condition:
Doublers installed on the current upper and lower firewalls cause abrupt transitions between the surface of the firewall and the surface of the doubler at the doubler edges.
(3)Cause:
Boeing requested GE to add doublers to the upper and lower firewalls to stiffen them.
(4)Improvement:
The specified RTV provides smooth interface transition for the seals which reduces air leakage.
(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 9250, Commercial Engine Standard Practices manual (SPM)
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: 573066
 
BPP: 11-72-21-02
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)
GEnx-1B, Boeing 787 Aircraft Maintenance Manual (AMM)
K.Interchangeability
One-way interchangeable.
L.Software Accomplishment Summary
None.
2.MATERIAL INFORMATION
A.Material - Price and Availability
(1)Parts necessary to do this Service Bulletin:
None.
(2)Other Spare Parts:
 
Part Number
Qty/ Eng
Part Name
Unit ($) Price
Qty/ Eng
Lead Time
 
2360M42G04
(1)
Firewall, Upper
52,090.00
(1)
5
 
2311M29G04
(1)
Firewall, Lower
33,710.00
(1)
5
NOTE:
Prices are provided for planning purposes and are subject to change.
(3)Consumables:
 
Code Number
Description
 
C01-007
RTV, Silicone Elastomer (RTV 106)
 
C01-159
Primer, RTV (primer)
 
C04-035
Solvent, General (isopropyl alcohol)
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
 
2305M18G07/ G08
(X)
Assembly, Aft Fan Stator Case
2305M18G07/ G08
(X)
RM
-/-
 
.2360M42G04
01-152, 72-21-00
(1)
Firewall, Upper (SIN 84401)
.2360M42G03
01-151, 72-21-00
(1)
RE/RW
1/A
 
.2311M29G04
01-372, 72-21-00
(1)
Firewall, Lower (SIN 84501)
.2311M29G03
01-371, 72-21-00
(1)
RE/RW
1/A
Operation Codes
RE=Replace
RM=Remains
RW=Rework
Change Code
1=One-way interchangeable.
Support Code
A=Old parts will no longer be supplied.
D.Parts Disposition
Rework.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Rework
(1)Rework the upper firewall (1, Figure 1) as follows:
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.
(a)Clean areas C and D of the upper firewall (1) with C04-035 isopropyl alcohol or equivalent. Refer to the SPM, 70-21-23, CLEANING METHOD NO. 23 - HAND-WIPE DEGREASING.
(b)Apply C01-159 primer to areas C and D.
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.
(c)Fill areas C and D with C01-007 RTV 106 to get a smooth transition.
(d)Do paragraph 3.A.(1)(a) thru paragraph 3.A.(1)(c) again on the other side of the upper firewall (1).
(2)Rework the lower firewall (2, Figure 1) as follows:
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.
(a)Clean areas H and L of the lower firewall (2) with C04-035 isopropyl alcohol or equivalent. Refer to the SPM, 70-21-23, CLEANING METHOD NO. 23 - HAND-WIPE DEGREASING.
(b)Apply C01-159 primer to areas H and L.
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.
(c)Fill areas H and L with C01-007 RTV 106 to get a smooth transition.
(d)Do the paragraph 3.A.(2)(a) thru paragraph 3.A.(2)(c) again on the other side of the lower firewall (2).
Upper and Lower Firewalls Rework
Figure 1   (Sheet 1)
Upper and Lower Firewalls Rework
Figure 1   (Sheet 2)