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 956-145 and up.
These serial numbers are the best available data.
The bolt P/N 2324M97P02 is affected by this Service Bulletin.
B.Description
This Service Bulletin introduces the new square head bolt (bolt) P/N 2402M17P01 to the high pressure compressor (HPC) rotor assembly.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's option.
NOTE:
This Service Bulletin can be accomplished in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce a new part and improve maintainability.
(2)Condition:
The current stage 5 rotor bolt mateface contact area was identified as a feature for product improvement.
(3)Cause:
The original design was not fully optimized to increase the area of contact of the bolt head mateface to as large as possible. However, it kept its full interchangeability.
(4)Improvement:
The new design bolt has an increased mateface contact area which will reduce the mateface contact stress and the potential for fretting of the spool flange.
(5)Substantiation:
Substantiation is by analysis and comparative analysis.

F.Approval
This Service Bulletin contains no modification information that revises the approved configuration and therefore does not require FAA approval.
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 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: 547461
 
BPP: 08-72-31-01
J.Publications Affected
GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
Two-way interchangeable.
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
 
2402M17P01
(60)
Bolt
24.00
(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
 
2305M51G06
(X)
Rotor Assembly, HPC
2305M51G06
(X)
RM
-/-
 
.2402M17P01
01-510A, 72-31-00
(60)
Bolt (Old Name)
(SIN 050F0)
Bolt, Square Head (New Name)
.2324M97P02
01-510, 72-31-00
(60)
RE
2/B
Operation Codes
RE=Replace RM=Remains
Change Code 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.
In order to obtain full benefit from this product improvement, full set incorporation is recommended.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
(1)Removal and installation instructions for the bolt (1, Figure 1) have not changed. Refer to the GEnx-1B EM, 72-31-00, DISASSEMBLY 001 and ASSEMBLY 001.

Figure 1