TASK 72-00-00-200-014 Engine General - Do An Eddy Current Inspection Of The LPC Fan Blade Leading Edge, Inspection-014

DMC:V2500-A0-72-00-0000-00A-353A-B|Issue No:001.00|Issue Date:2014-05-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

All

Common Information

TASK 72-00-00-200-014 Engine General - Do An Eddy Current Inspection Of The LPC Fan Blade Leading Edge, Inspection-014

Genereal

This TASK gives the procedure for the inspection of the LP Compressor fan blade leading edge. For the inspection of the other parts of the engine, refer to TASK 72-00-00-200-000 (INSPECTION/CHECK-000).

Disassembly is included in TASK 72-31-00-030-001 (DISASSEMBLY). Assembly is included in TASK 72-31-00-430-001 (ASSEMBLY)

NOTE

To identify the consumable materials refer to the PCI.

NOTE

Special tools are identified in the procedure by the tool primary number.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
IAE 2R19425 Differential eddy current probe0AM53IAE 2R19425
IAE 2R19426 Calibration test piece QC68470AM53IAE 2R19426

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 02-121 TEMPORARY MARKER PENCIL/CRAYONIE304CoMat 02-121
CoMat 05-126 ABRASIVE PAD, ALUMINUM OXIDE, VERY FINELOCALCoMat 05-126
CoMat 02-195 TEFLON TAPELOCALCoMat 02-195

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-00-00-250-051 Do a Calibration of the Eddy Current Equipment

    1. Refer to Figure.

    2. Protect the underside of the probe, IAE 2R19425 Differential eddy current probe 1 off, with CoMat 02-195 TEFLON TAPE. Make sure that the ferrite core is covered.

    3. Connect the probe to the eddy current instrument, select differential mode and adjust the frequency to 2000KHz.

    4. If frequency filteration is available, set the high pass filter to 2 - 5 Hz and the low pass filter to mains frequency.

    5. Put the probe on the test piece, IAE 2R19426 Calibration test piece QC6847 1 off, away from the 0.75 mm slot which is approximately central. Balance or null the instrument so the spot is centralised on the screen.

    6. Move the probe repeatedly over the slot and identify the figure of eight signal produced by the slot.

    7. Whilst still moving the probe adjust the phase angle such that the figure of eight signal is vertical. Adjust the gain control to produce 4 divisions peak to peak.

    8. If monitor gates are available, set them to just trigger on the signal from the 0.75 mm slot. Activate any audible or visual alarm warnings.

    9. The eddy current instrument is now calibrated.

    2. SUBTASK 72-00-00-250-052 Examine the LPC Fan Blades

    1. Refer to Figure.

    2. Remove any rough edges, nicks or burrs on the leading edge of the fan blades using CoMat 05-126 ABRASIVE PAD, ALUMINUM OXIDE, VERY FINE.

    3. If the blades are not disassembled from the LP Compressor Fan Module, number the blades with CoMat 02-121 TEMPORARY MARKER PENCIL/CRAYON, and turn the number one blade to the three o' clock position.

    4. Hook the edge of the probe over the concave leading edge at the tip of the blade.

    5. Balance/null the instrument to centralise the spot.

    6. Move the probe smoothly towards the root of the blade until the probe begins to lift off on the thick section near the root, observing the screen of the instrument.

    7. The spot moves slowly as the underlying thickness and geometry of the blade changes.

    8. Genuine cracks produce a quick vertical, or near vertical deflection in the form of a figure of eight, this can be small distorted, due to the high pass filtering.

    9. Do this procedure on all of the fan blades taking care of the bottom one third of the blade (the area is the bottom two fifth's from dovetail bottom of the blade, when blades are disassembled from the LP Compressor Fan Module).

    3. SUBTASK 72-00-00-250-053 Acceptance and Rejection of LP Compressor Fan Blades

    1. Refer to Figure.

    2. Accept slow moving/drifting signals which are essentially in a straight line.

    3. Reject fast moving, figure of eight or slightly distorted figure of eight signals.

    4. If the blade is rejected, record the details on the rejection pro-forma, and pass a copy to IAE Representative. Quarantine the blade pending further advice from IAE.

    4. Figure: Calibration of the eddy current equipment

    Calibration of the eddy current equipment

    Figure: LPC fan blade leading edge inspection rejection record sheet

    LPC fan blade leading edge inspection rejection record sheet

Requirements After Job Completion

Follow-On Conditions

NONE
Manufacturer Code:0AM53
Enterprise Name:IAE INTERNATIONAL AERO ENGINES AG
BU Name:NULL
Building:SUITE 400
Street:628 HEBRON AVENUE
City:GLASTONBURY
State:CT
Zip Code:06033
Country:USA
Manufacturer Code:IE304
Enterprise Name:DELETED
BU Name:DELETED,SEE CAGE CODE 0V6W9
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:IE304
Supply Number:CoMat 02-121
Type:sp01
Supply Short Name:CoMat 02-121 TEMPORARY MARKER PENCIL/CRAYON
Supply Name:CoMat 02-121 TEMPORARY MARKER PENCIL/CRAYON
Specification Groups:
Doc NumberType
OMAT: 261BEROL VERITHIN (HARD TYPE)
Suppliers:
ManufacturerRemarks
IE304
K5720
K6835
LOCAL
Manufacturer Code:LOCAL
Supply Number:CoMat 02-195
Type:sp01
Supply Short Name:CoMat 02-195 TEFLON TAPE
Supply Name:CoMat 02-195 TEFLON TAPE
Specification Groups:
Doc NumberType
3M No.62 MIL-I-23594 JCR-263
Suppliers:
ManufacturerRemarks
LOCAL
76381
81349
Manufacturer Code:LOCAL
Supply Number:CoMat 05-126
Type:sp01
Supply Short Name:CoMat 05-126 ABRASIVE PAD, ALUMINUM OXIDE, VERY FINE
Supply Name:CoMat 05-126 ABRASIVE PAD, ALUMINUM OXIDE, VERY FINE
Specification Groups:
Doc NumberType
OMAT: 583 (RR REF)SCOTCH BRITE TYPE A.7447 SCOTCH BRITE No. 7447 MIL-A-9962A TYPE I GRADE A
JCR-256 (JAEC REF)
PMC 4095 (PW REF)
Suppliers:
ManufacturerRemarks
LOCAL
K0993
K6835
28124
Manufacturer Code:0AM53
Tool Number:IAE 2R19425
Tool Name:IAE 2R19425 Differential eddy current probe
Manufacturer Code:0AM53
Tool Number:IAE 2R19426
Tool Name:IAE 2R19426 Calibration test piece QC6847