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 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 21115 EAGP?-72-327 

Page 1 of 8 
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. 

July21/1s EAGP7-72-327 

Page 2 ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION 
g

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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 
SPOOLS FROM SERVICE. 

Publications Changed 

Not applicable. 

Interchangeability 

Not applicable. 

Information in the Appendix 

July 21/15 

Alternate Accomplishment Instructions (No) 

Progression Charts (No) 

Added Data (Yes) 

Revision to Table of Limits (No) 

Inspection Procedures (No) 

ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION 

EAGP?-72-327 

Page 4 
g

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 5 
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 
I 

I 

[1 J SECTION A-A 

1. STAGES2-5 SPOOL 

2. STAGE 5 VANE ASSEMBLY (QTY-10) 

3. STAGE 5 HONEYCOMB CARTRIDGE (QTY-10) 

July 21/15 

LOCATION OF THE STAGES 2-5 SPOOL 

FIGURE 1 

ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION 

.,. __ ,_, __ . 

·-

.... _ 

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.... _ 

--··-- --.,_. 

----

[3] 

8525671 

EAGP?-72-327 

Page 7 
July 21/15 

Original 378937-1 EAW 

EAGP?-72-327 

ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION Page 8