§ EngineAI/iance SERVICE BULLETIN ENGINE- HIGH PRESSURE COMPRESSOR (HPC) ROTOR ASSEMBLY- REMOVAL OF THE STAGES 7-9 COMPRESSOR ROTOR SPOOLS FROM SERVICE MODEL APPLICATION GP7270, GP7272, GP7277 BULLETIN ISSUE SEQUENCE EAGP7 Series 72-328 ATA NUMBER 72-35-20 ENGINE ALLIANCE, LLC. PROPRIETARY INFORMATION The information contained
in this document

is Engine Alliance, LLC ("EA") Proprietary Information and is disclosed
in confidence.

It is the property of EA and shall not be used, disclosed
to others or reproduced for any purpose, including, without limitation,
to design, manufacture
or repair parts or to obtain FAA or other government approval to do so, without the express written consent of EA. Neither receipt nor possession
of this document alone, from any source, constitutes such permission. Unauthorized possession, use, copying or disclosure may result in criminal and/or civil liability.
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 subject to the Export Administration Regulations (EAR) 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 (i.e. export license, license exception, NLR), is strictly prohibited. EAR Export Classification: ECCN 9E991 Compliance Category 2 EA Distribution Code 2686 July 21/15 EAGP?-72-328 Page
1 of 8§ EngineADiance Summary The purpose of this Service Bulletin
is to remove certain stages 7-9 compressor rotor spools PN 2031M90G04,
PN 2031M90G05, and PN 2031M90G07 from service. Planning Information Effectivity Data Engine Models Applicable GP7270, GP7272, GP7277 Engine Serial Nos. -Any engine that has a stages 7-9 compressor rotor spool with a serial number listed in Table 1. Table

1 Stages 7-9 Stages 7-9 Compressor Compressor Rotor Rotor Spool Spool Part Number Serial Number 2031M90G04 GWNOCSJO' 2031M90G05 GWNOK4K2' 2031M90G05 GWNOKKDW 2031M90G05 GWNOLEN1 2031M90G05 GWNOLNF1 2031M90G05 GWNOM435 2031M90G05 GWNOMW6C 2031M90G05 GWNOPF8K 2031M90G07 GWNOT1RT 2031M90G07 GWNOT590 2031M90G07 GWNOT7NK 2031M90G07 GWNOT8LL 2031M90G07 GWNOTC3N 2031M90G07 GWNOTEJ7 *Hardware was removed from service before this Service Bulletin was issued. NOTE: The stages 7-9 compressor rotor spool serial number effectivity data contained in this Service Bulletin
is taken from the records of parts incorporation during shop visit. Concurrent Requirements This Service Bulletin should be done at the same time as Reference
4, Service Bulletin No. EAGP7-72-327. Reason 1. Problem: July 2111sEAGP7 -72-328 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION
Page 2t!J.) EngineAJ/iance The affected stages 7-9 compressor rotor spools are suspected
to have been installed with some combination
of stage 6, stage 7, and/or stage
8 vane assemblies with honeycomb cartridges that were not cut at the correct radial height. This condition increases an interference with seal teeth on the stages 7-9 compressor rotor spool, which does not allow the part to reach the ultimate life objective of the stages 7-9 compressor rotor spool. 2. Cause: The radial height of the affected stage 6, stage 7, and stage
8 vane assemblies were not inspected appropriately during the implementation

of the abradable (honeycomb) replacement repair. 3. Solution: Remove and replace the affected stages 7-9 compressor rotor spools and associated hardware. Description Remove and replace the affected stages 7-9 compressor rotor spools and the associated hardware. Compliance Category

2 EA recommends you do this Service Bulletin as soon as possible without effect on revenue service, but before 2,100 cycles since engine shop visit. Approval Data The data contained

in this Service Bulletin has been reviewed by the appropriate governmental authority and the repair(s) and modification(s) herein comply with the applicable Aviation Regulations and are APPROVED for installation

in the model(s) listed in this Service Bulletin. The aircraft TC holder has been informed of this inspection change. Manpower No more man-hours are necessary when done at complete disassembly/assembly. Weight Data No change. Electrical Load Data Not applicable. Software Accomplishment Summary Not applicable. References 1. Engine Alliance GP7270 and GP7277, Illustrated Parts Catalog, Part No. 5700308. 2. GP7000 Series, Engine Manual, Part No. 5700147. 3. GP7000 Series, Engine Cleaning, Inspection And Repair (ClR) Manual, Part No. 5700309. July 2111sEAGP? -72-328 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION
Page
3 ......**o..•--~**
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--...._ --··----"-·----t!J.7 EngineAHiance 4. Service Bulletin No. EAGP?-72-327: ENGINE- HIGH PRESSURE COMPRESSOR (HPC) ROTOR ASSEMBLY- LIMITED ENGINE WORKSCOPE FOR REMOVAL AND REPLACEMENT
OF THE HPC STAGE

2 THROUGH STAGE

5 SPOOL Publications Changed Not applicable. Interchangeability Not applicable. Information

inthe Appendix July 21115 Alternate Accomplishment Instructions (No) Progression Charts (No) Added Data (Yes) Revision toTable of Limits (No) Inspection Procedures (No) ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION EAGP?-72-328 Page4tft.7 EngineAI/iance Material Information Material

-Cost and Availability 1. There is no kit provided to do this Service Bulletin. Industry Support Program Not applicable. The material data that follows is for each engine. Not applicable. Material Data for Each Spare Engine Not applicable. Re'1dentified Parts Not applicable. Necessary Tools No more Support Equipment

is necessary. Other Material Information Data Not applicable. July 21/15 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION o.....

,•••·-.... ---·-·-··---
--...._ --------**~·-·** ---- EAGP?-72-328 Page
5Accomplishment Instructions General

§ EngineAJ/iance 1. Removal and installation
of the HPC stages7-9 compressorrotor spool ([1], Figure 1) have not changed. Reference

2, Engine Manual, Chapter/Section, 72-35-20, DISASSEMBLY-03 and ASSEMBLY-02. A. Remove the subject HPC stages7-9 compressorrotor spool ([1]. Figure 1). B. Install
aneworaserviceable HPC stages7-9 compressorrotor spool [1] intothe engine. Reference

2, Engine Manual, Chapter/Section, 72-35-20, ASSEMBLY-01 and ASSEMBLY-02. 2. Remove all stage
6vaneassemblies ([2], Figure 1), stage
7vaneassemblies [3], and stage
8 vaneassemblies [4]. Reference

2, Engine Manual, Chapter/Section 72-35-00, DISASSEMBLY-03
and DISASSEMBLY-04,
anddoasfollows: A. Replace theold stage
6 honeycomb cartridges ([5}, Figure 1) on stage
6vane assemblies [2], old stage
7 honeycomb cartridges [6]on stage
7 honeycomb vane assemblies [3]. andold stage
8 honeycomb cartridges [71 on stage
8vaneassemblies [4]with new honeycomb cartridges. Refer toReference

3,CIR Manual, 72-35-03, REPAIR-03. NOTE: All stage
6vaneassemblies ([2]. Figure

1 ), stage
7vaneassemblies [3], and stage
8vaneassemblies
[41 will need replacement
of stage
6 honeycomb cartridge [5], stage
7 honeycomb cartridge [6], and stage
8 honeycomb cartridge [7] installed. B. Install serviceable stage
6vaneassemblies ([2]. Figure 1), stage
7vaneassemblies [3], and stage
8vaneassemblies
[4]inthe engine. Reference

2, Engine Manual, Chapter/Section 72-35-00, ASSEMBLY-02 and ASSEMBLY-03. 3. Notify theEA through Fleet Support thatthe affected HPC stages7-9 compressorrotor spool ([1]. Figure 1) has been removed: GE Aviation Fleet Support Toll Free Phone: 1-877-432-3272 Phone: (513) 552-3272 FAX: 1-877-432-3329 E-mail: aviation.fleetsupport@ge.com Website: http://geaviation.com/support/ A. Provide the HPC stages7-9 compressorrotor spool ([1], Figure 1) part number, serial number, part time, cycles since new (CSN), and dateof removal. July 21/15EAGP7 -72-328 ENGINE ALLIANCE,LLCPROPRIETARY INFORMATION
Page
6§ EngineA/Hance [1] **~** [2

[3

I I [5]

[1] REF 1. STAGES 7-9 COMPRESSOR ROTOR SPOOL 2. STAGE

6 VANE ASSEMBLY (QTY-10)SECTION A-A 3. STAGE

7 VANE ASSEMBLY (QTY-10) 4. STAGE

8 VANE ASSEMBLY (QTY-10) 5. STAGE

6 HONEYCOMB CARTRIDGE (QTY-10) 6. STAGE

7 HONEYCOMB CARTRIDGE (QTY-10) 7. STAGE

8 HONEYCOMB CARTRIDGE (QTY-10) NOTE: SOME ITEMS NOT SHOWN FOR CLARITY. LOCATION OF THE STAGES 7-9 COMPRESSOR ROTOR SPOOL FIGURE

1

A 8525670 July 21/15 EAGP?-72-328 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION
Page 7 "'··'-·--·
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--...._ --··----..,_. ----Appendix AddedData July21/15

§EngineAHiance InternalReferenceInformation RevisionNo.ReferenceOriginationDocument Original378492-1EAW EAGP?-72-328 ENGINEALLIANCE,LLCPROPRIETARYINFORMATION
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