1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B58, -1B64, -1B67, -1B70
This Service Bulletin has been introduced in production to these GEnx-1B54, GEnx-1B58, GEnx-1B64, GEnx-1B67, and GEnx-1B70 engines:
•
GEnx-1B engines, serial numbers 956-124, 956-125 and 956-140 and up.
These serial numbers are the best available data.
B.Description
This Service Bulletin releases a new HPC Stage 3-4 Spool P/N 2439M37G01 and a new HPC Stage 6-10 Spool P/N 2439M35G01 onto the GEnx-1B engine.
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.
The life limits for the new HPC Stage 3-4 Spool P/N 2439M37G01 and the new HPC Stage 6-10 Spool P/N 2439M35G01 have been added to the GEnx-1B Engine Manual, Section 05-11-02 by Temporary Revision 05-0005. Refer to the GEnx-1B Engine Manual for the life limits of these parts.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce a new HPC Stage 3-4 Spool P/N 2439M37G01 and a new HPC Stage 6-10 Spool P/N 2439M35G01.
(2)Condition:
The current spool designs have features that need improvement in LCF and thermal growth capability to support higher thrust applications.
The Stage 6-10 spool also has an aft flange with a complicated scallop design which adds complexity to the manufacturing process.
(3)Cause:
Development engine testing of the current design spools showed that additional thermal growth capability of the stage 3-4 spool spacer arm and the stage 6-10 spool stage 8 disk was necessary for higher thrust applications. Also, there were other locations that were limited in LCF capability due to high stress. The current stage 6-10 spool aft flange had not been evaluated for design simplification.
(4)Improvement:
Materials with better thermal growth properties are used in additional areas in both of the spools. For the stage 3-4 spool, the material of the spacer arm between the stage 3 and stage 4 disks is changed from Ti 17 to Ti 6242. For the stage 6-10 spool, the stage 8 disk material is changed from Inco 718 to Rene 88. LCF capability is improved by geometry changes in features of both spools. For the stage 3-4 spool, the aft seal teeth have a larger base radius to reduce the stress at these locations. For the stage 6-10 spool, the stage 7 bore hook interface geometry with the stage 7 bore is changed to reduce stresses at this location. The aft flange scallop was removed to simplify the manufacturing process.
(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 1.1 lb (0.5 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: 573024
 
BPP: 09-72-31-01
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 for 70K and lower thrust applications.
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
 
2439M37G01
(1)
Spool - Stage 3 and 4 Compressor Rotor
Quote
(1)
Quote
 
2439M35G01
(1)
Spool - Stages 6-10 Compressor Rotor
Quote
(1)
Quote
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
 
Part Number
Qty/ Eng
Part Name
Unit ($) Price
Pkg Qty
Lead Time Days
 
2305M53G11
(1)
HPC Module Assembly
Quote
(1)
Quote
 
2305M51G07
(1)
Rotor Assembly - HPC
Quote
(1)
Quote
(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
(X)
Propulsor Module Assembly
(SIN 0010C)
2376M20G05
(X)
RM
-/-
 
.2305M53G1133-011, 72-00-02
(1)
HPC Module Assembly
(SIN 00108)
.2305M53G09
33-010, 72-00-02
(1)
RW
2/B
 
..2305M51G07
15-011, 72-30-00
(1)
Rotor Assembly - HPC
(SIN 05000)
..2305M51G06
15-010, 72-30-00
(1)
RW
2/B
 
...2439M35G01
01-481, 72-31-00
(1)
Spool - Stages 6-10 Compressor Rotor
(SIN 050AR)
...2357M30G02
01-480, 72-31-00
(1)
RE
2/B
 
...2439M37G01
01-731, 72-31-00
(1)
Spool - Stage 3 and 4 Compressor Rotor
(SIN 050B4)
...2357M34G01
01-730, 72-31-00
(1)
RE
2/B
Operation Codes
RE=Replace
RM=Remains
RW=Rework
Change Codes 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
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
(1)Removal and installation instructions for the stage 3-4 spool and the stage 6-10 spool have not changed. Refer to the GEnx-1B EM, 72-31-00, DISASSEMBLY 001 and ASSEMBLY 001.