DOC AIRBUS | AMM A320FEddy - Current Inspection of the 3 Mount Struts (1, 3 and 14) of Tangential Struts of Turbine Rear Frame POST SB CFM 72-0620 [CFMB]
TASK 72-56-00-250-801-A
Eddy - Current Inspection of the 3 Mount Struts (1, 3 and 14) of Tangential Struts of Turbine Rear Frame POST SB CFM 72-0620
This task is applicable for SAC engines
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 72-56-00-860-056-A ** ON A/C NOT FOR ALL
Subtask 72-56-00-210-056-A ** ON A/C NOT FOR ALL
Subtask 72-56-00-410-072-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:43:28 UTC
Eddy - Current Inspection of the 3 Mount Struts (1, 3 and 14) of Tangential Struts of Turbine Rear Frame POST SB CFM 72-0620
ZONE: 400
1. Reason for the JobThis task is applicable for SAC engines
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE |
| No specific | AR | WARNING NOTICE(S) |
| 856A2692G01 | 1 | EDDY CURRENT INSPECTION KIT |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP1040) | methyl ethyl ketone |
| (Material No.CP2191) | durite G421 |
| (Material No.CP2721) | CS 333 X |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-00-00-000-042-A | Removal of the Power Plant |
| TASK 71-00-00-000-042-A-01 | Removal of the Power Plant with the Engine Positioner TWW 75E (MIAG) |
| TASK 71-00-00-000-042-A-03 | Removal of the Power Plant with Jacxson Tool |
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 72-56-00-000-001-A | Removal of the Flame Arrestor and Flange Assembly |
| TASK 72-56-00-400-001-A | Installation of the Flame Arrestor and Flange Assembly |
| TASK 78-11-11-000-041-A | Removal of the Core Nozzle Assembly |
| TASK 78-11-11-400-041-A | Installation of the Core Nozzle Assembly |
| TASK 78-11-12-000-041-A | Removal of the Centerbody |
| TASK 78-11-12-400-041-A | Installation of the Centerbody |
| TASK 78-30-00-081-041-B | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-B | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-B | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-B | Closing of the Thrust Reverser Doors |
Turbine Rear Frame - Area to Be InspectedSubtask 72-56-00-860-056-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Make sure that the core nozzle assembly is removed (Ref. AMM TASK 78-11-11-000-041).
(2) Make sure that the center body is removed (Ref. AMM TASK 78-11-12-000-041).
(3) Make sure that the flame arrestor and the rear cover are removed (Ref. AMM TASK 72-56-00-000-001).
Subtask 72-56-00-941-064-A ** ON A/C NOT FOR ALL (1) Make sure that the core nozzle assembly is removed (Ref. AMM TASK 78-11-11-000-041).
(2) Make sure that the center body is removed (Ref. AMM TASK 78-11-12-000-041).
(3) Make sure that the flame arrestor and the rear cover are removed (Ref. AMM TASK 72-56-00-000-001).
B. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five 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) in position to tell persons not to energize the FADEC 1(2).
Subtask 72-56-00-010-070-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five 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) in position to tell persons not to energize the FADEC 1(2).
C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
Subtask 72-56-00-040-052-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
D. Deactivation of the Thrust Reverser
Subtask 72-56-00-010-071-A ** ON A/C NOT FOR ALL WARNING:
MAKE THE THRUST REVERSER UNSERVICEABLE. IF THE THRUST REVERSER IS NOT MADE UNSERVICEABLE, IT CAN OPERATE ACCIDENTALLY BECAUSE THE BLOCKER DOOR HOLD-OPEN ROD DOES NOT RESIST THE ACTUATOR HYDRAULIC PRESSURE.
THIS CAN CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT.
(1) Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041). E. Open the Thrust Reverser Doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 72-56-00-210-056-A ** ON A/C NOT FOR ALL
A. Prepare the turbine rear frame for the eddy-current inspection as follows:
Subtask 72-56-00-280-050-A ** ON A/C NOT FOR ALL WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
(1) Do a visual inspection of the areas to be inspected. Make a mark on the part at the location of all blends, nicks, or other anomalies which may cause an indication during the inspection. If needed, use methyl ethyl ketone (Material No.CP1040) , CS 333 X (Material No.CP2721) or durite G421 (Material No.CP2191) to clean the part. B. Calibrate the 856A2692G01 EDDY CURRENT INSPECTION KIT to the initial settings as follows:
(1) Allow the eddy-current instrument to warm up. Refer to the instructions of the manufacturer.
(2) Set the eddy-current instrument to the initial settings as below with the example of Rohmann Elotest B300 instrument.
(3) Eddy-current probe(s) from the kit (856A2692G01 EDDY CURRENT INSPECTION KIT: 9970-958-576).
(4) Calibration block from the kit (856A2692G01 EDDY CURRENT INSPECTION KIT: 9970-958-579).
(5) Apply teflon from the kit (856A2692G01 EDDY CURRENT INSPECTION KIT) to the probe. Repeat this operation for each probe.
(6) Put the probe of the inspection kit on the calibration standard away from the EDM notches and null the probe. Repeat this operation for each probe.
Subtask 72-56-00-210-057-A ** ON A/C NOT FOR ALL (1) Allow the eddy-current instrument to warm up. Refer to the instructions of the manufacturer.
(2) Set the eddy-current instrument to the initial settings as below with the example of Rohmann Elotest B300 instrument.
| Instrument Type | Frequency Range | Gain | Filters |
|---|---|---|---|
| Elotest B300 | 1 MHz | Preamplifier: auto | LP:100 HP:STATIC |
(4) Calibration block from the kit (856A2692G01 EDDY CURRENT INSPECTION KIT: 9970-958-579).
(5) Apply teflon from the kit (856A2692G01 EDDY CURRENT INSPECTION KIT) to the probe. Repeat this operation for each probe.
(6) Put the probe of the inspection kit on the calibration standard away from the EDM notches and null the probe. Repeat this operation for each probe.
C. Scan across the EDM notch at a speed equal to the one that will be used during the inspection and adjust the instrument gain, phase and dot position so that the peak response from the EDM notch 0.5 mm x 0.1 mm has an amplitude equal to 1.5 or 2 volts depending on the probe. Repeat this operation for each probe.
Subtask 72-56-00-210-058-A ** ON A/C NOT FOR ALL NOTE: Scan across the 2 EDM notches. Adjust the instrument parameters on the 0.5 mm x 0.1 mm defect.
NOTE: Personnel performing these inspections must be certified to one of the following: MIL-STD-410, COSAC EN 4179 or ASNT-SNT-TC-1A level 2 minimum.
D. Inspect the two areas (location A and location B) as follows:
(1) Using the appropriate probe, scan in two directions all the areas as it is shown on each figure. Pay special attention near the variation of shapes.
(b) Clean and re-inspect the area in different scanning directions to check the indication.
(c) After completion of the indication evaluation procedure, if the indication is still equal to or more than 1.000 millivolts, note the place of the indication on the turbine rear frame.
(d) Using probe 9970-958-576. Scan perpendicularly to the defect in order to determine its length.
Subtask 72-56-00-280-051-A ** ON A/C NOT FOR ALL (1) Using the appropriate probe, scan in two directions all the areas as it is shown on each figure. Pay special attention near the variation of shapes.
- Probe 9970-958-576, locations A, H, I, J
- Probe 9970-958-576, locations B, K, L.
NOTE: As we are performing a manual inspection, the way to inspect must be the closest to the theoretic scanning shown on the figures (not strictly).
(a) Evaluate the horizontal and vertical indications that are equal to or more than 1.000 millivolts peak to peak (half of calibration level). (b) Clean and re-inspect the area in different scanning directions to check the indication.
(c) After completion of the indication evaluation procedure, if the indication is still equal to or more than 1.000 millivolts, note the place of the indication on the turbine rear frame.
(d) Using probe 9970-958-576. Scan perpendicularly to the defect in order to determine its length.
E. Do a calibration/check after each area inspection (and/or each probe) as follows:
(2) If the peak notch response is within 10 percent more or less, the calibration is acceptable.
(3) If the amplitude of the response from the EDM notch has decreased by more than 10 percent, recalibrate and re-inspect all areas inspected since the previous calibration.
(4) If the amplitude of the response from the EDM notch has increased by more than 10 percent, recalibrate and re-inspect any areas which were previously found to be rejected since the previous calibration.
Subtask 72-56-00-250-050-A ** ON A/C NOT FOR ALL NOTE: The calibration check must be done with the initial calibration settings.
(1) Do a calibration check after each inspection when a system component or inspector is changed, or when the inspector suspects a change may have occurred in the inspection. (2) If the peak notch response is within 10 percent more or less, the calibration is acceptable.
(3) If the amplitude of the response from the EDM notch has decreased by more than 10 percent, recalibrate and re-inspect all areas inspected since the previous calibration.
(4) If the amplitude of the response from the EDM notch has increased by more than 10 percent, recalibrate and re-inspect any areas which were previously found to be rejected since the previous calibration.
F. Eddy-Current Inspection of the Turbine Frame Assembly:
Table 2: Commercial application
Table 2: Corporate application
5. Close-upTable 2: Commercial application
| Max. measured crack length | Re-inspection interval |
|---|---|
| no crack found | 4.700 cycles |
| Less than 0.20 in. (5.08 mm) | 4.700 cycles |
| More than or equal to 0.20 in. (5.08 mm) and less than 0.39 in. (9.91 mm) | 3.700 cycles |
| More than or equal to 0.39 in. (9.91 mm) and less than 0.79 in. (20.07 mm) | 2.900 cycles |
| More than or equal to 0.79 in. (20.07 mm) and less than 1.38 in. (35.05 mm) | 2.000 cycles |
| More than or equal to 1.38 in. (35.05 mm) and less than 1.97 in. (50.04 mm) | 1.000 cycles |
| More than or equal to 1.97 in. (50.04 mm) and less than 2.56 in. (65.02 mm) | 120 cycles |
| More than or equal to 2.56 in. (65.02 mm) | Remove the engine (Ref. AMM TASK 71-00-00-000-042). |
| Max. measured crack length | Re-inspection interval |
|---|---|
| no crack found | 3.240 cycles |
| More than or equal to 0.20 in. (5.08 mm) | 3.240 cycles |
| More than or equal to 0.20 in. (5.08 mm) and less than 0.39 in. (9.91 mm) | 2.500 cycles |
| More than or equal to 0.39 in. (9.91 mm) and less than 0.79 in. (20.07 mm) | 2.000 cycles |
| More than or equal to 0.79 in. (20.07 mm) and less than 1.38 in. (35.05 mm) | 1.300 cycles |
| More than or equal to 1.38 in. (35.05 mm) and less than 1.97 in. (50.04 mm) | 730 cycles |
| More than or equal to 1.97 in. (50.04 mm) and less than 2.56 in. (65.02 mm) | 80 cycles |
| More than or equal to 2.56 in. (65.02 mm) | Remove the engine (Ref. AMM TASK 71-00-00-000-042). |
NOTE: For each location if one single crack, measure the crack length.
If there are multiple cracks, cumulate the crack lengths.
If there are multiple cracks, cumulate the crack lengths.
NOTE: Locations to be inspected (on mount struts 1, 3 and 14):
- Trailing edge hub/strut fillet radius
- Leading edge hub/strut fillet radius.
- Trailing edge hub/strut fillet radius
- Leading edge hub/strut fillet radius.
Subtask 72-56-00-410-072-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the flame arrestor and the rear cover (Ref. AMM TASK 72-56-00-400-001).
(3) Install the center body (Ref. AMM TASK 78-11-12-400-041).
(4) Install the core nozzle (Ref. AMM TASK 78-11-11-400-041).
(5) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 72-56-00-440-052-A ** ON A/C NOT FOR ALL Subtask 72-56-00-410-073-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the flame arrestor and the rear cover (Ref. AMM TASK 72-56-00-400-001).
(3) Install the center body (Ref. AMM TASK 78-11-12-400-041).
(4) Install the core nozzle (Ref. AMM TASK 78-11-11-400-041).
(5) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR