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 
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 2111s EAGP7 -72-328 

ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION Page 2 
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 2111s EAGP? -72-328 

ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION Page 3 

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Not applicable. 

Information in the Appendix 

July 21115 

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?-72-328 

Page 4 
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 5 
B. Install a new or a serviceable HPC stages 7-9 compressor rotor spool [1] into the 

engine. Reference 2, Engine Manual, Chapter/Section, 72-35-20, ASSEMBLY-01 

and ASSEMBLY-02. 

2. Remove all stage 6 vane assemblies ([2], Figure 1), stage 7 vane assemblies [3], and 

stage 8 vane assemblies [4]. Reference 2, Engine Manual, Chapter/Section 72-35-00, 

DISASSEMBLY-03 and DISASSEMBLY-04, and do as follows: 

A. Replace the old stage 6 honeycomb cartridges ([5}, Figure 1) on stage 6 vane 

assemblies [2], old stage 7 honeycomb cartridges [6] on stage 7 honeycomb vane assemblies [3]. and old stage 8 honeycomb cartridges [71 on stage 8 vane assemblies 

[4] with new honeycomb cartridges. Refer to Reference 3, CIR Manual, 72-35-03, 

REPAIR-03. 

NOTE: All stage 6 vane assemblies ([2]. Figure 1 ), stage 7 vane assemblies [3], and 

stage 8 vane assemblies [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 6 vane assemblies ([2]. Figure 1), stage 7 vane assemblies 

[3], and stage 8 vane assemblies [4] in the engine. Reference 2, Engine Manual, Chapter/Section 72-35-00, ASSEMBLY-02 and ASSEMBLY-03. 

3. Notify the EA through Fleet Support that the affected HPC stages 7-9 compressor rotor 

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 7-9 compressor rotor spool ([1], Figure 1) part number, serial 

number, part time, cycles since new (CSN), and date of removal. 

July 21/15 EAGP7 -72-328 

ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION Page 6 
[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 

8525670 

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July 21/15 

Original 378492-1 EAW 

EAGP?-72-328 

ENGINE ALLIANCE, LLC PROPRIETARY INFORMATION Page 8