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Copyright (2013) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION
REVISION 1 TO SERVICE BULLETIN 72-0080
Revision 1 is issued to update paragraphs 1.I., References, 1.K., Interchangeability, 2.A., Material - Price and Availability, and 2.C., Configuration Chart.
The original was issued March 01, 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 956-158 and up.
The high pressure turbine (HPT) P/N 2305M57G05 is affected by this Service Bulletin.
B.Description
This Service Bulletin provides a HPT rotor assembly P/N 2305M57G04 with stage 2 blades (HPT stage 2 blades) P/N 2305M35G05 without thermal barrier coating (TBC).
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 reduce cost of ownership.
(2)Condition:
The current HPT rotor assembly incorporates a HPT stage 2 blade P/N 2305M35G06.
(3)Cause:
It has been determined that the TBC can be removed from the airfoil of the HPT stage 2 blade without impacting the reliability or durability of the blade.
(4)Improvement:
Blades without TBC reduce customer cost of ownership by reducing the repair cost of the HPT stage 2 blades.
(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
The complete compliance with this Service Bulletin decreases weight by 0.7 lb (0.3 kg).
I.References (Use the latest version of these documents)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
GEnx-1B S/B 72-0040, ENGINE - General (72-00-00) - GEnx-1BXXG04 Configuration Performance Improvement Package Introduction
  NOTE:
The reference document listed below is for the engine manufacturer's internal use only:
 
CID: 573295, 573899
J.Publications Affected
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
 Two-way interchangeable.
 There is no restriction to mix stage 2 blade part numbers within the same HPT rotor.
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
 
2305M35G05
(62)
Blade, Stage 2
12,380.00
(1)
Quote
 
2305M35G04
(ALT)
Blade, Stage 2
12,380.00
(1)
Quote
 
2305M35G08
(ALT)
Blade, Stage 2
12,380.00
(1)
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 te Part Number
Qty/ Eng
Part Name
Old Part Number/ IPC Location
Qty/ Eng
Op Code
Chg/ Sprt Code
 
2376M20G05
(X)
Propulsor Module Assembly
2376M20G05
(X)
RM
-/-
 
2376M20G06
S/B 72-0040
(X)
Propulsor Module Assembly
2376M20G06
S/B 72-0040
(X)
RM
-/-
 
.2305M57G04
34-020B, 72-00-02
(1)
Rotor Assembly, HPT
(SIN 15000)
.2305M57G05
34-020A, 72-00-02
(1)
RE
5/B
 
..2305M35G05
01-112, 72-53-00
(62)
Blade, Stage 2
(SIN 150B0)
..2305M35G06
01-111, 72-53-00
(62)
RE
2/B
 
..2305M35G08
01-112A, 72-53-00
(ALT)
Blade, Stage 2
(SIN 150B0)
..2305M35G07
01-111A, 72-53-00
(ALT)
RE
2/B
 
..2305M35G04
01-110B, 72-53-00
(ALT)
Blade, Stage 2
(SIN 150B0)
--
(-)
AD
5/-
Operation Codes
AD=Add
RE=Replace
RM=Remains
 Change Codes 2=Two-way interchangeable.
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
The removal and installation instructions for the HPT stage 2 blades have not changed. Refer to the GEnx-1B EM, 72-50-00, DISASSEMBLY 001 and ASSEMBLY 001.