§ EngineAHiance SERVICE BULLETIN ENGINE- HIGH PRESSURE COMPRESSOR (HPC) ROTOR ASSEMBLYLIMITED ENGINE WORKSCOPE FOR REMOVAL AND REPLACEMENT

OF THE HPC STAGE

2 THROUGH STAGE

5 SPOOL MODEL APPLICATION GP7270, GP7277 BULLETIN ISSUE SEQUENCE EAGP7 Series 72-327 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 orin part, this notice and the notice set forth on each page of this document shall appear

in any such reproduction

in whole orin 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 21115 EAGP?-72-327 Page

1 of 8§ EngineAI/iance Summary The purpose
of this Service Bulletin
is to provide instructions
for a limited engine disassembly,

to remove, and replace the affected HPC stage

2 through stage

5 spool (HPC stages 2-5 spool) PN 382-1 04-807-0. Planning Information Effectivity Data Engine Models Applicable GP7270, GP7277 Engine Serial Nos. -Any engine that has a HPC stages 2-5 spool with
a serial number listed in Table

1 below: Table 1 - List of Affected HPC Stages 2-5 Spool Serial Numbers HPC Stage 2-5 Spool HPC Stage 2-5 Spool Part Number Serial Numbers 382-104-807-0 PA354309 382-1 04-807-0 PA365755 382-1 04-807-0 PA395350 382-1 04-807-0 PA395351 382-104-807-0 PA400593 382-104-807-0 PA440647 382-1 04-807-0 PA537953 382-104-807-0 PA558943 382-1 04-807-0 PA585572 382-1 04-807-0 PA595000 382-104-807-0 PA614325 382-104-807-0 PA664322 382-1 04-807-0 PA664323 382-1 04-807-0 PA783040 382-104-807-0 PA827684 382-1 04-807-0 PA851148 382-1 04-807-0 PA856693 382-1 04-807-0 PA861974 382-1 04-807-0 PC134797

(') *Hardware has been removed from service at the time Service Bulletin was issued. NOTE: The HPC stages 2-5 spool serial numbers effectivity data contained

in this Service Bulletin are taken from the records of parts incorporation during shop visit. July21/1sEAGP7-72-327 Page

2 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATIONt!JI EngineA/1/ance Concurrent Requirements This Service Bulletin must be done at the same time as Reference

4, Service Bulletin No. EAGP?-72-328. Reason 1. Problem: The affected HPC stages 2-5 spools are suspected

to have been installed with stage 5 vane assemblies with honeycomb cartridges that were not cut at the correct radial height. This condition increases an interference with seal teeth on the HPC stages 2-5 spool, which does not allow the part to reach the ultimate life objective
of the HPC stages 2-5 spool. 2. Cause: The radial height of the affected stage

5 vane assemblies were not inspected appropriately during the implementation

of the abradable (honeycomb) replacement repair. 3. Solution: Remove and replace the affected HPC stages 2-5 spool and the associated hardware. Description Remove and replace the affected HPC stages 2-5 spools (listed
in Effectivity Data paragraph) and the associated hardware. Compliance Category

2 EA recommends you do this SeNice Bulletin as soon as possible without effect on revenue seNice, 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 SeNice 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. July 21/15 EAGP?-72-327 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION

Page

3**~~**EngineAHiance References 1. EngineAllianceGP7270andGP7277.IllustratedParts Catalog.PartNo.5700308. 2.GP7000 Series, Engine Manual,PartNo.5700147. 3.GP7000 Series, Engine Cleaning, InspectionAnd Repair (CIR) Manual,PartNo.5700309. 4.ServiceBulletinNo.EAGP7-72-328: ENGINE-HIGHPRESSURE COMPRESSOR (HPC)ROTORASSEMBLY- REMOVALOFTHESTAGES7-9COMPRESSOR ROTOR SPOOLSFROMSERVICE. Publications Changed Not applicable. Interchangeability Not applicable. Information

inthe Appendix July21/15 Alternate AccomplishmentInstructions (No) ProgressionCharts (No) AddedData (Yes) Revision
toTableofLimits (No) InspectionProcedures (No) ENGINE ALLIANCE,LLCPROPRIETARY INFORMATION EAGP?-72-327 Page
4t§A/ EngineA//Iance Material Information Material

-Cost and Availability 1. There
is no kit provided
to do this Service Bulletin. Industry Support Program Contact your customer support manager (CSM}. The material data that follows
is for each engine. Not applicable. Material Data for Each Spare Engine Not applicable. Reidentified Parts Not applicable. Necessary Tools No more Support Equipment

is necessary. Other Material Information Data Part Number 382-127-801-6 Nomenclature HONEYCOMB CARTRIDGE- STAGE

5 July 21/15 EAGP?-72-327 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION

Page

5Accomplishment Instructions General

§ EngineA/Uance 1. Removal and installation

of the HPC stages 2-5 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 stages 2-5 spool ([1]. Figure 1). B. Install

a new or a serviceable HPC stages 2-5 spool [1] into the engine. Reference

2, Engine Manual. Chapter/Section, 72-35-20, ASSEMBLY-01
and ASSEMBLY-02. 2. Removal and installation

of the stage
5 vane assemblies ({2], Figure
1) with the new stage 5 honeycomb cartridges
[3] PN 382-127-801-6 installed have not changed. Reference

2, Engine Manual, Chapter/Section 72-35-00, DISASSEMBLY-04

and ASSEMBLY-02
and Reference

3, CIR Manual, Chapter/Section, 72-35-03, REPAIR-03 and do as follows: A Remove the stage

5 vane assemblies ([2], Figure
1) and replace the stage

5 honeycomb cartridges [3]. Reference

3, CIR Manual, Chapter/Section, 72-35-03, REPAIR-03. NOTE: All the stage
5 vane assemblies ({2], Figure 1), will need replacement

of stage
5 honeycomb cartridges
[3] installed. B. Install serviceable stage
5 vane assemblies

[2] in the engine. Reference

2, Engine Manual, Chapter/Section, 72-35-00, ASSEMBLY-02. 3. Notify the EA through Fleet Support that the affected HPC stages 2-5 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 stages 2-5 spool ([1], Figure
1) part number, serial number, and part time and cycles since new (CSN). July 21/15
EAGP7 -72-327 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION

Page
6§EngineAJ/iam:eII[1JSECTIONA-A1.STAGES2-5SPOOL2.STAGE5VANEASSEMBLY(QTY-10)3.STAGE5HONEYCOMBCARTRIDGE(QTY-10)July21/15LOCATIONOFTHESTAGES2-5SPOOLFIGURE1ENGINEALLIANCE,LLCPROPRIETARYINFORMATION.,.__,_,__.·-...._---·-·-··-----...._--··----.,_.----[3]8525671EAGP?-72-327Page7Appendix Added Data July 21/15

§ EngineAI/iance Internal Reference Information Revision No.Reference Origination Document Original 378937-1
EAW EAGP?-72-327 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION

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