1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B58, -1B64, -1B67, -1B70
This Service Bulletin is applicable to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-123 thru 956-126, 956-128 and up.
These serial numbers are the best available data.
The fan upper OGV pylon (upper OGV pylon) P/N 2305M89G02, fan lower outlet guide vane pylon (lower OGV pylon) P/N 2305M97G01, fan outlet guide vane (OGV) P/N 2321M61G02, fan outlet guide vane (OGV) P/N 2321M62G02, seal P/N 2410M24G01, and plug P/N 2410M25G01 are affected by this Service Bulletin.
B.Description
This Service Bulletin introduces the new upper OGV fan pylon (upper OGV pylon) P/N 2380M78G01, lower OGV fan pylon (lower OGV pylon) P/N 2363M44G01, type 1 outlet guide vane (OGV) P/N 2363M40G01, and type 6 outlet guide vane (OGV) P/N 2363M42G01, and also removes the plug P/N 2410M25G01 and seal 2410M24G01.
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.
(2)Condition:
The old upper OGV pylon, lower OGV pylon, and OGVs are made using a combination of sheet metal and castings that are welded together. This is a complicated design that requires extensive labor and difficult welding operations. The proposed change will replace the upper OGV pylon and OGVs under the mount with three titanium bondments. In addition, the lower OGV pylon will be replaced with an aluminum bondment.
(3)Cause:
The new design provides an estimated performance improvement of 0.1 percent fan efficiency. The plug P/N 2410M25G01 and seal 2410M24G01 cannot be installed on the new bonded pylon designs and therefore they need to be eliminated from the parts list.
(4)Improvement:
The upper OGV pylon, lower OGV pylon, and OGVs new designs will have a simplified construction. This will also result in an improved surface condition.
This Service Bulletin improves the specific fuel consumption (SFC) by 0.06 percent.
(5)Substantiation:
Substantiation is by analysis and 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
The complete compliance with this Service Bulletin increases weight by 1.5 lb (0.68 kg).
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: 547349, 547349-1, 547989
 
BPP: 07-72-21-01
J.Publications Affected
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
Interchangeable as a set.
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
 
2363M40G01
(1)
Vane, Type 1 Outlet Guide
Quote
(X)
Quote
 
2363M42G01
(1)
Vane, Type 6 Outlet Guide
Quote
(X)
Quote
 
2363M44G01
(1)
Pylon, Lower OGV Fan
Quote
(X)
Quote
 
2380M75G01
(1)
Pylon, Upper OGV Fan
Quote
(X)
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
 
2305M18G02-G07
(X)
Assembly, Aft Fan Stator Case
(SIN 00109)
2305M18G02-G07
(X)
RM
-/-
 
.2380M75G01
10-290A, 72-21-00
(1)
Pylon, Fan Upper OGV (Old Name)
Pylon, Upper OGV Fan (New Name)
(SIN 8400J)
.2305M89G02
10-290, 72-21-00
(1)
RE
5/B
 
--
(-)
Seal
(SIN 95555)
.2410M24G01
10-720, 72-21-00
(1)
DE
5/B
 
.2363M44G01
10-300A, 72-21-00
(1)
Pylon, Fan Lower Outlet Guide Vane (Old Name)
Pylon, Lower OGV Fan (New Name)
(SIN 8400K)
.2305M97G01
10-300, 72-21-00
(1)
RE
5/B
 
--
(-)
Plug
(SIN 95552)
.2410M25G01
10-730, 72-21-00
(1)
DE
5/B
 
.2363M40G01
10-310A, 72-21-00
(1)
Vane, Fan Outlet Guide (Old Name)
Vane, Type 1 Outlet Guide (New Name)
(SIN 8400L)
.2321M61G02
10-310, 72-21-00
(1)
RE
5/B
 
.2363M42G01
10-320A, 72-21-00
(1)
Vane, Fan Outlet Guide (Old Name)
Vane, Type 6 Outlet Guide (New Name)
(SIN 8400M)
.2321M62G02
10-320, 72-21-00
(1)
RE
5/B
Operation Codes
DE=Delete
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.General
(1)Removal and installation instructions for the upper OGV pylon, lower OGV pylon, and OGVs have not changed. Refer to the GEnx-1B EM, 72-21-00, DISASSEMBLY 001 and ASSEMBLY 001.