GE90-100 - SB 72-0320 R01 ENGINE - High Pressure Compressor Rotor Assembly (72-31-00) - Inspection of HPC Stages 2-5 Spool Seal Teeth

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GE90-100 SERVICE BULLETIN - 72-0320 R01 Revised:

05/11/2010

SB 72-0320 R01 ENGINE - HIGH PRESSURE COMPRESSOR ROTOR

ASSEMBLY (72-31-00) - INSPECTION OF HPC STAGES 2-5 SPOOL SEAL

TEETH

Issued:

06/12/2009

GE PROPRIETARY INFORMATION

The information contained in this publication is GE proprietary information and is disclosed in confidence. It

is the property of GE and shall not be used, disclosed to others or reproduced without the express written

consent of GE, including, but without limitation, it is not to be used in the creation, manufacture,

development, or derivation of any repairs, modifications, spare parts, designs, or configuration changes or to

obtain FAA or any other government or regulatory approval to do so. If consent is given for reproduction in

whole or in part, this notice and the notice set forth on this media shall appear in any such reproduction in

whole or in part. This technical data is considered ITAR and/or EAR controlled pursuant to 22 CFR Part 120-

130 and 15 CFR Parts 730-774 respectively. Transfer of this data by any means to a Non-U.S. Person,

whether in the United States or abroad, without the proper U.S. Government authorization (e.g., License,

exemption, NLR, etc.), is strictly prohibited.

All technical documentation and information contained herein, with respect to assembly and disassembly,

cleaning, inspection methods and limits, repair methods and limits, operational limits, life limits and the like,

have been developed and approved for use with engines and parts that have been manufactured and/or

approved by GE and that have been maintained in accordance with GE technical documentation and

recommendations. GE has no contractual or legal obligation for, nor knowledge of, non-GE-approved parts

and repairs. Accordingly, this documentation is not intended to apply to non-GE-approved parts and repairs.

Copyright (2010) General Electric Company, U.S.A.

TRANSMITTAL INFORMATION

REVISION 1 TO SERVICE BULLETIN 72-0320

Revision 1 is issued to update paragraphs 1., PLANNING INFORMATION and 

3., ACCOMPLISHMENT INSTRUCTIONS.

The original was issued June 12, 2009. Revision bars in the left margin identify changes.

1. PLANNING INFORMATION

A. Effectivity

* * * GE90-110B1 and -115B

This Service Bulletin is applicable to all GE90-100 engines.

The spools stages 2-5 [high pressure compressor (HPC) stages 2-5 spools] 

P/N 351-103-106-0, P/N 351-103-107-0, P/N 351-103-108-0, P/N 351-103-109-0, P/N 351-103-

141-0, P/N 351-103-142-0, P/N 351-103-143-0, and P/N 351-103-144-0 are affected by this

Service Bulletin.
GE90-100 - SB 72-0320 R01 ENGINE - High Pressure Compressor Rotor Assembly (72-31-00) - Inspection of HPC Stages 2-5 Spool Seal Teeth

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B. Description

This Service Bulletin provides procedures to do eddy current inspection (ECI) or spot fluorescent

penetrant inspection (Spot FPI) of the stages 1-2 rotating seal of the HPC stages 2-5 spool.

C. Compliance

Category 3

GE recommends that you do this Service Bulletin at the next shop visit of the engine, excluding

low pressure turbine (LPT) stage 6 (GE90-100 S/B 72-0226) and outlet guide vane (OGV) leaf

seal quick turn replacement (GE90-100 S/B 72-0338).

NOTE: This Service Bulletin can be accomplished in two ways:

A. With the HPC upper half case and/or HPC lower half case removed.

B. With HPC rotor assembled, or bladed HPC stages 2-5 spool, or at piece part level.

This Service Bulletin is offered to improve the reliability or performance of your GE product, or to

help prevent the occurrence of the event or condition described in this Service Bulletin. If the

operator elects not to participate in the bulletin, that decision will be taken into consideration by

GE in evaluating future product performance issues that may arise in the operator’s fleet.

D. Concurrent Requirements

None.

E. Reason

(1) Objective:

Inspect HPC stages 2-5 spool for potential cracking at stages 1-2 seal teeth.

(2) Condition:

An engine in service has experienced a crack in the stages 1-2 seal teeth.

(3) Cause:

Crack initiated at the tip of the forward seal tooth of stages 1-2 rotating seal.

(4) Inspection:

Inspect stages 1-2 seal teeth for evidence of cracking.

(5) Substantiation:

The inspection techniques described in this Service Bulletin have been demonstrated to be

effective in other revenue service engines.

F. Approval

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.

G. Manpower

After you get access to the HPC stages 2-5 spool, you will need approximately 

2 man-hours to do the inspection portion of this Service Bulletin.

H. Weight and Balance

Weight and balance are not changed.
GE90-100 - SB 72-0320 R01 ENGINE - High Pressure Compressor Rotor Assembly (72-31-00) - Inspection of HPC Stages 2-5 Spool Seal Teeth

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I. References (Use the latest version of these documents)

GEK 9250, Commercial Engine Standard Practices Manual (SPM)

GEK 109993, GE90-100 Engine Manual (EM)

GEK 110005, GE90-100 Illustrated Parts Catalog (IPC)

GE90-100 S/B 72-0226, ENGINE - Low Pressure Turbine Rotor/Stator Assembly (72-56-00) -

Stage 6 LPT Blade Replacement

GE90-100 S/B 72-0338, ENGINE - Stage 9 OGV (72-41-03) - Repair of Engines with Missing

Stage 9 OGV Leaf Seals

National Aerospace Standard 410 (NAS-410)

J. Publications Affected

None.

K. Interchangeability

Not applicable.

L. Software Accomplishment Summary

Not applicable.

2. MATERIAL INFORMATION

A. Material - Price and Availability

(1) Parts necessary to do this Service Bulletin:

None.

(2) Other Spare Parts:

None.

(3) Consumables:

Code Number Description

C04-003 Solvent, General

(acetone)

C04-035 Solvent, General

(isopropyl alcohol)

C05-003 Marking Pen

C10-040 Tape, Teflon

B. Industry Support Information

None.

C. Configuration Chart

Not applicable.

D. Parts Disposition
GE90-100 - SB 72-0320 R01 ENGINE - High Pressure Compressor Rotor Assembly (72-31-00) - Inspection of HPC Stages 2-5 Spool Seal Teeth

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HPC stages 2-5 spools found unserviceable per paragraph 3., ACCOMPLISHMENT

INSTRUCTIONS, must be removed and replaced. Refer to the appropriate GE90-100 EM

instructions. After removal, return unserviceable HPC stages 2-5 spools to GE. Please contact

your local GE representative for shipping details.

E. Tooling - Price and Availability

Tool Number Description

9C1578G01 Eddy Current Inspection Kit (inspection kit)

ELOTEST B1 SDM/U Eddy Current Test Instrument

Nortec NDT 19 Eddy Current Flaw Detector

Nortec NDT 19E2 Eddy Current Flaw Detector

Nortec NDT 1000 Eddy Current Flaw Detector

To order the inspection kit, please contact:

Customer Support Center

Phone: (331) 6414-8866

Fax: (331) 6479-8555

E-mail: snecma.csc@snecma.fr

3. ACCOMPLISHMENT INSTRUCTIONS

A. General

(1) This procedure starts when the HPC stages 2-5 spool is exposed and after any of the

following conditions is met:

(a) Removal of the HPC upper half case and/or HPC lower half case. Refer to the GE90-100

EM, 72-00-00, SPECIAL PROCEDURES 002, TASK 72-00-00-800-802.

(b) At HPC rotor exposure during standard HPC overhaul. Refer to the GE90-100 EM, 72-

30-00, DISASSEMBLY 001.

B. ECI of the HPC Stages 2-5 Spool Seal Teeth

(1) Prepare ECI of the HPC stages 2-5 spool seal teeth (Figure 1), as follows:

(a) Personnel requirements:

1 Personnel who do these inspections must be certified by National Aerospace

Standard (NAS) 410/EN4179, Level 2 minimum or an equivalent document accepted

by the local regulatory agencies.

2 It is recommended that personnel who do these inspections receive complete

instruction on the use of this procedure. They must show they are able to do the

calibration, inspection, and analysis before accept/reject authority is given.

3 The following instructions do not certify a person as an inspector by NAS

410/EN4179, Level 2 minimum or any local agency.
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4 Changes in the procedures or the equipment will change the inspection sensitivity.

When you want to do or use something different, the procedure and the equipment

must be examined and approved by GE Aircraft Engines. Please contact your local

GE representative.

WARNING: USE PROTECTIVE GLOVES TO PREVENT INJURY FROM SHARP EDGES AND

ROUGH SURFACES.

CAUTION: USE ONLY APPROVED MARKING MATERIALS ON THE HPC STAGES 2-5 SPOOL.

THE HPC STAGES 2-5 SPOOL IS A TITANIUM PART. TITANIUM REACTS TO

CHLORINATE AND HALOGEN PRODUCTS. IF YOU DO NOT USE APPROVED

MARKING MATERIALS, DAMAGE CAN OCCUR.

CAUTION: YOU CAN DAMAGE THE SEAL TEETH VERY EASILY.

(b) Prepare the HPC stages 2-5 spool for the ECI, as follows:

1 Do a visual inspection of the HPC stages 2-5 spool seal teeth. Make a mark with an

approved marking pen (C05-003) or equivalent on the part at the location of all

blends, nicks, or other anomalies which can cause an indication during the visual

inspection. Refer to the SPM, 70-16-02, TEMPORARY MARKING.

NOTE:If this Service Bulletin is accomplished while the HPC upper half case and/or HPC

lower half case is removed, do not turn the HPC rotor while you inspect the HPC

stages 2-5 spool seal teeth. Turn the HPC rotor first and then inspect exposed

area of the HPC stages 2-5 spool.

NOTE:If this Service Bulletin is accomplished while the HPC upper half case and/or HPC

lower half case is removed, handle the blades of HPC stage 1 blisk to manually

turn the HPC rotor clockwise aft looking forward (ALF).

2 Put a mark to locate the inspected area on the HPC stages 2-5 spool seal tooth with

an approved marking pen (C05-003) or equivalent. Refer to the SPM, 70-16-02,

TEMPORARY MARKING.

3 Repeat steps 3.B.(1)(b)1 and 2 to perform a 360 degrees inspection of the HPC

stages 2-5 spool.

NOTE: After the visual inspection, turn the HPC rotor clockwise ALF and visually check

that the entire circumference of seal tooth has been inspected.

(c) Calibrate the ECI instrument to the initial settings, as follows:

1 Allow the ECI instrument to warm up. Refer to the manufacturer's instructions.

2 Set one of the approved ECI instruments types shown below to the initial settings,

as follows:

Instrument Type Settings

ELOTEST B1 SDM/U

(version 3)

OR

ELOTEST B1 SDM/U

with 

Probe Adapter:

Rohmann

Frequency: 500 kHz

BW: HF

Gain: 16V and 16H dB

Y-Spread: 0 dB (version 4)

X-Spread: 0 dB
GE90-100 - SB 72-0320 R01 ENGINE - High Pressure Compressor Rotor Assembly (72-31-00) - Inspection of HPC Stages 2-5 Spool Seal Teeth

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P/N: B1 NOB 8H with PreAmp: 0 dB or more

Filter: 100 Hz LP

HP: Off

Phase: Approx. 195 degrees

Instrument Type Settings

Nortec NDT 19

OR

Nortec NDT 19E2

Frequency: 500 kHz

H Gain: 47.650 dB

V Gain: 47.650 dB

Probe Drive: Hi (2.0)

Phase/Angle: Approx. 245 degrees

P.H.: 128

P.V.: 128

Alarm: Box

Instrument Type Settings

Nortec NDT 1000

with

Probe Adapter:

Nortec N1000PA8B

Frequency: 500 kHz

H Gain: 45.0 dB

V Gain: 45.0 dB

Angle: 57 degrees

V-Pos: 50.0 percent 

H-Pos: 50.0 percent

HP Filter: Off

LP Filter: 100 Hz

HGPSSP: 4-Pole

Sweep: Off

Sweep Eras: On
GE90-100 - SB 72-0320 R01 ENGINE - High Pressure Compressor Rotor Assembly (72-31-00) - Inspection of HPC Stages 2-5 Spool Seal Teeth

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Probe Drive: High

Horn: Off

DT/BX: Box

DSTERS: Off

Capture: 10.0 s

PRSIST: 4 s

Graticule: On

Alarm Dwel: 0.0

Alarm: Box

Box 1: Positive

Bottom: 80 percent

Top: 98.5 percent

Right: 50.5 percent

Left: 0.5 percent

Box 2: Off

Bottom: 25.0 percent

Top: 75.0 percent

Right: 75.0 percent

Left: 25.0 percent

Box 3: Off

Bottom: 25.0 percent

Top: 75.0 percent

Right: 75.0 percent

Left: 25.0 percent

3 Apply Teflon tape (C10-040) to the probe of the inspection kit 9C1578G01.

4 Put the probe on the calibration standard edge, away from the electrical discharge

machining (EDM) notches, and null the probe (Figure 3).

5 Adjust the phase to reach a horizontal lift-off line from the left to the middle of the

screen (Figure 4).

6 Scan across the EDM notch and adjust the instrument gain and phase to have a

peak response of the 0.06 inch (1.5 mm) EDM notch with an amplitude equal to "4"

horizontal major screen divisions (Figure 5).

7 Make a record of the initial calibration data. Refer to the HPC Stages 2-5 Spool

Calibration And Inspection Record Form (Figure 9).
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8 Increase the vertical gain by +6 dB.

9 Rotate the phase 15 degrees clockwise (CW) for phase adjustment (Figure 6).

10 Adjust phase and amplitude to "3" vertical major screen divisions with respect of

horizontal amplitude (Figure 7).

11 Make a record of the final calibration data. Refer to the HPC Stages 2-5 Spool

Calibration And Inspection Record Form (Figure 9).

(2) Do an ECI on the stages 1-2 seal teeth of the HPC stages 2-5 spool, as follows:

WARNING: USE PROTECTIVE GLOVES TO PREVENT INJURY FROM SHARP EDGES AND ROUGH

SURFACES.

CAUTION: YOU CAN DAMAGE THE SEAL TEETH VERY EASILY.

(a) Do an ECI on the forward seal tooth (Figure 2), as follows:

1 Put the probe of the inspection kit 9C1578G01 on the forward seal tooth.

2 Null the probe and adjust the phase to align the horizontal lift-off signature with the

master signal (Figure 6).

NOTE:If this Service Bulletin is accomplished while the HPC upper half case and/or HPC

lower half case is removed, handle the blades of HPC stage 1 blisk to manually

turn clockwise the HPC rotor.

3 Scan 360 degrees around the seal tooth.

NOTE: The scans do not have to be continuous for 360 degrees. You can divide the HPC

stages 2-5 spool into sections and do an ECI of each section. Make sure that you

overlap all the scans.

NOTE:If this Service Bulletin is accomplished while the HPC upper half case and/or HPC

lower half case is removed, do not turn the HPC rotor while you inspect the HPC

stages 2-5 spool seal teeth. Turn the HPC rotor first and then inspect exposed

area of the HPC stages 2-5 spool.

NOTE:If this Service Bulletin is accomplished while the HPC upper half case and/or HPC

lower half case is removed, handle the blades of HPC stage 1 blisk to manually

turn clockwise the HPC rotor.

CAUTION: USE ONLY APPROVED MARKING MATERIALS ON THE HPC STAGES 2-5 SPOOL.

THE HPC STAGES 2-5 SPOOL IS A TITANIUM PART. TITANIUM REACTS TO

CHLORINATE AND HALOGEN PRODUCTS. IF YOU DO NOT USE APPROVED

MARKING MATERIALS, DAMAGE CAN OCCUR.

4 Monitor the ECI responses and record any vertical indication which is equal to or

greater than a total of "3" vertical major screen divisions. Reinspect all indications

for repeatability when you see it. Make a record of each indication on the HPC

Stages 2-5 Spool Inspection Record Form (Figure 9). Identify locations of indications

on the part using an approved marking pen (C05-003) or equivalent. Refer to the

SPM, 70-16-02, TEMPORARY MARKING.

(b) Do an ECI of the aft seal tooth. Refer to step 3.B.(2)(a)1 through 3.B.(2)(a)4. For the aft

seal tooth, the connector on the probe must point forward. When you inspect a seal

tooth, make sure the probe touches the adjacent seal tooth as a guide. Refer to Figure 2

for the correct probe position.

NOTE: The HPC stages 2-5 spool angular positions are in CW direction ALF with the "0" angle

at the location of the stage 2 blade slot number "1" (Figure 8).
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(3) Do a calibration/check after HPC stage 2-5 spool inspection, as follows:

(a) Do a calibration/check after each ECI of the HPC stages 2-5 spool and when a system

component or the inspector is changed, or when the inspector suspects that a change

may have occurred in the inspection system.

NOTE: You must do the calibration/check with initial settings and the following changes:

1 Reduce the vertical gain by -6 dB.

2 Return to the horizontal lift-off signal and then rotate the phase 15 degrees

counterclockwise (CCW).

(b) If the peak notch response is "3.5" to "4.5" vertical major screen divisions, the calibration

is satisfactory.

(c) If the peak notch horizontal response is less than "3.5" vertical major screen divisions,

calibrate the probe and repeat the ECI.

(d) If the peak notch horizontal response is "4.5" vertical major screen divisions or more, and

there were no rejected indications, the test is satisfactory.

(e) If the peak notch horizontal response is "4.5" vertical major screen divisions or more and

there were confirmed indications which are equal to or greater than "3" vertical major

screen divisions, repeat the calibration and reinspect all indications.

(4) Do an evaluation of the data, as follows:

(a) All indications which are equal to or greater than "3" vertical major screen divisions must

be visually evaluated, refer to step 3.B.(4)(b) below.

(b) If the source of the indication is a nick, a damaged seal tooth, or both, please contact

GE90-100 Product Support Engineering (PSE).

(5) Dispose parts, as follows:

(a) If there is an ECI indication equal to or greater than "3" vertical major screen divisions,

the part is not serviceable. Refer to paragraph 

2.D., Parts Disposition for instructions.

(b) Record the results and the disposition of parts on the HPC Stages 2-5 Spool Calibration

And Inspection Record Form (Figure 9). Send a copy to the following GE90-100 PSE:

e-mail: jacques.tschora@snecma.fr

e-mail: francois.pagliano@snecma.fr

C. Alternate Procedure - Spot FPI of the HPC Stages 2-5 Spool Seal Teeth

WARNING: ACETONE IS EXPLOSIVE, AN IRRITANT, AN ALLERGEN, AND HAS POISONOUS

DETERIORATION. USE VAPOR/FUME CONTROL OR USE A RESPIRATOR.

WARNING: USE PROTECTIVE GLOVES TO PREVENT INJURY FROM SHARP EDGES AND ROUGH

SURFACES.

WARNING: ISOPROPYL ALCOHOL IS TOXIC AND FLAMMABLE. USE PERSONAL PROTECTION

EQUIPMENT. USE IN A WELL-VENTILATED AREA.

CAUTION: HPC BLADES AND HPC STAGES 2-5 SPOOL ARE TITANIUM PARTS. TITANIUM REACTS TO

CHLORINATE AND HALOGEN PRODUCTS. MAKE SURE THAT TITANIUM PARTS CANNOT BE

IN CONTACT WITH PROHIBITED SOLVENTS SUCH AS TRICHLOROETHYLENE,

TRICHLOROETHANE, OR PERCHLOROETHYLENE, TO AVOID TITANIUM CONTAMINATION.
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CAUTION: YOU CAN DAMAGE THE SEAL TEETH VERY EASILY.

NOTE:If this Service Bulletin is accomplished while the HPC upper half case and/or HPC lower half

case is removed, do not turn the HPC rotor while you clean or inspect the HPC stages 2-5

spool seal teeth. Turn the HPC rotor first and then inspect exposed area of the HPC stages 2-5

spool.

NOTE:If this Service Bulletin is accomplished while the HPC upper half case and/or HPC lower half

case is removed, handle the blades of HPC stage 1 blisk to manually turn the HPC rotor

clockwise ALF.

(1) Wipe the HPC stages 2-5 spool seal teeth with a clean white cloth saturated with isopropyl

alcohol (C04-035) or acetone (C04-003).

(2) Do a visual inspection of the HPC stages 2-5 spool seal teeth for cleanliness (Figure 1).

Repeat step 3.C.(1) if necessary.

CAUTION: USE ONLY APPROVED MARKING MATERIALS ON THE HPC STAGES 2-5 SPOOL. THE

HPC STAGES 2-5 SPOOL IS A TITANIUM PART. TITANIUM REACTS TO CHLORINATE

AND HALOGEN PRODUCTS. IF YOU DO NOT USE APPROVED MARKING MATERIALS,

DAMAGE CAN OCCUR.

(3) Do a visual inspection of the HPC stages 2-5 spool seal teeth (Figure 1). Make a mark with

an approved marking pen (C05-003) or equivalent per SPM, 70-16-02, TEMPORARY

MARKING, on the part at the location of all blends, nicks, or other anomalies which can

cause an indication during the visual inspection.

(4) Do a Spot FPI of the HPC stages 2-5 spool seal teeth (Figure 1). Refer to the SPM, 70-32-

03, SPOT-FLUORESCENT-PENETRANT INSPECTION. Inspect the entire circumference

(360 degrees) of the seal teeth. Pay special attention to the forward side of the seal teeth.

Identify locations of indications on the part with an approved marking pen (C05-003) or

equivalent. Refer to the SPM, 70-16-02, TEMPORARY MARKING.

NOTE: Fluorescent penetrant inspection per SPM, 70-32-02, FLUORESCENT PENETRANT

INSPECTION, is considered as an alternate method to inspect the HPC stages 2-5 spool

forward seal teeth when the HPC stages 2-5 spool is inspected at piece part level per

GE90-100 EM, 72-31-06, INSPECTION 001.

(5) Dispose parts, as follows:

(a) FPI indications are not permitted. If indications are present, the part should be

considered unserviceable. Refer to paragraph 2.D., Parts Disposition for instructions.

(b) Record the Spot FPI results and the disposition of the inspected HPC stages 2-5 spool

on the HPC Stages 2-5 Spool Inspection Record Form (Figure 9). Send a copy to the

following GE90-100 PSE:

e-mail: jacques.tschora@snecma.fr

e-mail: francois.pagliano@snecma.fr
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Inspection of the HPC Stages 2-5 Spool Seal Teeth

Figure 1
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HPC Stages 2-5 Spool - Interstage Seal Teeth Probe Positions

Figure 2
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Calibration Standard - Description

Figure 3
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Lift-Off Adjustment

Figure 4
GE90-100 - SB 72-0320 R01 ENGINE - High Pressure Compressor Rotor Assembly (72-31-00) - Inspection of HPC Stages 2-5 Spool Seal Teeth

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Amplitude Adjustment

Figure 5
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Phase Adjustment

Figure 6
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Evaluation Level

Figure 7
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Top Location - 12 O'clock Position

Figure 8
GE90-100 - SB 72-0320 R01 ENGINE - High Pressure Compressor Rotor Assembly (72-31-00) - Inspection of HPC Stages 2-5 Spool Seal Teeth

https://customer.geae.com/...=ge90-100-sb-72-0320-r01.htm&strAction=View&open=openwindow&enginefamily=GE90-100[5/17/2010 10:03:26 AM]

HPC Stages 2-5 Spool Inspection Record Form

Figure 9

GE PROPRIETARY INFORMATION - Subject to the restrictions on the media.