DOC AIRBUS | AMM A320FEddy Current Inspection of the LP Compressor Fan Blades Leading Edge [IAE]
TASK 72-00-00-200-023-B
Eddy Current Inspection of the LP Compressor Fan Blades Leading Edge
1. Reason for the Job
A. This TASK is for V2500-A5 engines.
B. This TASK gives the procedure for the eddy current inspection of the LP compressor fan blades leading edges.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 72-00-00-941-124-A ** ON A/C NOT FOR ALL
Subtask 72-00-00-730-053-A ** ON A/C NOT FOR ALL
Subtask 72-00-00-942-065-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:00:45 UTC
Eddy Current Inspection of the LP Compressor Fan Blades Leading Edge
1. Reason for the Job
A. This TASK is for V2500-A5 engines.
B. This TASK gives the procedure for the eddy current inspection of the LP compressor fan blades leading edges.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | MAT - WORK |
| No specific | AR | RECORDER - EDDY CURRENT, HIGH SPEED |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V02-121) | marker pen |
| (Material No.V02-195) | Teflon Low Friction Tape |
| (Material No.V05-126) | scotch brite |
| REFERENCE | DESIGNATION |
|---|---|
Figure of Eight Signal from Calibration Slot (No High Pass Filter)Subtask 72-00-00-941-124-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 72-00-00-941-125-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
B. Put the Ground Support Equipment in to Position
(1) Put the ACCESS PLATFORM 1M(3 FT) in position.
(2) Put the MAT - WORK in position.
4. Procedure(1) Put the ACCESS PLATFORM 1M(3 FT) in position.
(2) Put the MAT - WORK in position.
Subtask 72-00-00-730-053-A ** ON A/C NOT FOR ALL
A. Do a Calibration of the Eddy Current Equipment
(1) Protect the underside of the IAE2R19425, with Teflon Low Friction Tape (Material No.V02-195) . Make sure that the ferrite core is covered.
(2) Connect the probe to the RECORDER - EDDY CURRENT, HIGH SPEED, select differential mode and adjust the frequency to 2000 KHz.
(3) If the frequency filtration is available, set the high pass filter to 2-5 Hz and the low pass filter to mains frequency.
(4) Put the probe on the IAE2R19426, away from the 0.75 mm (0.0295 in.) slot which is approximately central. Balance or null the instrument so that the spot is centralized on the screen.
(5) Move the probe repeatedly over the slot and identify the figure of eight signal produced by the slot.
(6) While 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.
(7) If monitor gates are available, set them to just trigger on the signal from 0.75 mm (0.0295 in.) slot. Activate any audible or visual alarm warnings.
(8) The eddy current instrument is now calibrated.
Subtask 72-00-00-250-052-A ** ON A/C NOT FOR ALL (1) Protect the underside of the IAE2R19425, with Teflon Low Friction Tape (Material No.V02-195) . Make sure that the ferrite core is covered.
(2) Connect the probe to the RECORDER - EDDY CURRENT, HIGH SPEED, select differential mode and adjust the frequency to 2000 KHz.
(3) If the frequency filtration is available, set the high pass filter to 2-5 Hz and the low pass filter to mains frequency.
(4) Put the probe on the IAE2R19426, away from the 0.75 mm (0.0295 in.) slot which is approximately central. Balance or null the instrument so that the spot is centralized on the screen.
(5) Move the probe repeatedly over the slot and identify the figure of eight signal produced by the slot.
(6) While 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.
(7) If monitor gates are available, set them to just trigger on the signal from 0.75 mm (0.0295 in.) slot. Activate any audible or visual alarm warnings.
(8) The eddy current instrument is now calibrated.
B. Examine the LPC Fan Blades
(1) Remove any rough edges, nicks or burrs on the leading edge of the fan blades. Use scotch brite (Material No.V05-126) .
(2) Number the blades with a marker pen (Material No.V02-121) , and turn the number one blade to the three o'clock position.
(3) Hook the edge of the probe over the concave leading edge at the tip of the blade.
(4) Balance/null the instrument to centralize the spot.
(5) Move the probe smoothly towards the root of the blade until the probe begins to lift off on the thick section near the root, monitoring the screen of the instrument.
(6) The spot moves slowly as the underlying thickness and geometry of the blade changes.
(7) Genuine cracks will produce a quick vertical deflection in the form of a figure of eight, this can have a small distortion, due to the high pass filtering.
(8) Do this procedure on all of the fan blades taking care of the bottom one third of the blade.
Subtask 72-00-00-250-053-A ** ON A/C NOT FOR ALL (1) Remove any rough edges, nicks or burrs on the leading edge of the fan blades. Use scotch brite (Material No.V05-126) .
(2) Number the blades with a marker pen (Material No.V02-121) , and turn the number one blade to the three o'clock position.
(3) Hook the edge of the probe over the concave leading edge at the tip of the blade.
(4) Balance/null the instrument to centralize the spot.
(5) Move the probe smoothly towards the root of the blade until the probe begins to lift off on the thick section near the root, monitoring the screen of the instrument.
(6) The spot moves slowly as the underlying thickness and geometry of the blade changes.
(7) Genuine cracks will produce a quick vertical deflection in the form of a figure of eight, this can have a small distortion, due to the high pass filtering.
(8) Do this procedure on all of the fan blades taking care of the bottom one third of the blade.
C. Accept/Reject
(1) Accept slow moving/drifting signals which are essential in a straight line.
(2) Reject fast moving, figure of eight or slightly distorted figure of eight signals.
(3) If the blade is rejected, record the details on the reject blade pro-forma and pass a copy to the local IAE Customer Support Representative. Quarantine the blade pending further advice from IAE.
5. Close-up(1) Accept slow moving/drifting signals which are essential in a straight line.
(2) Reject fast moving, figure of eight or slightly distorted figure of eight signals.
(3) If the blade is rejected, record the details on the reject blade pro-forma and pass a copy to the local IAE Customer Support Representative. Quarantine the blade pending further advice from IAE.
Subtask 72-00-00-942-065-A ** ON A/C NOT FOR ALL
A. Remove the Ground Support Equipment
(1) Remove the workmat.
(2) Remove the access platform.
(3) Remove the warning notices.
(1) Remove the workmat.
(2) Remove the access platform.
(3) Remove the warning notices.