DOC AIRBUS | AMM A320FVisual Inspection after Volcanic Ash, Dust or Sand Ingestion [CFML]
TASK 72-00-00-210-818-A
Visual Inspection after Volcanic Ash, Dust or Sand Ingestion
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 72-00-00-941-228-A
Subtask 72-00-00-410-269-A
[Rev.10 from 2021]
2026.04.01 02:50:45 UTC
Visual Inspection after Volcanic Ash, Dust or Sand Ingestion
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-13-79-610-802-A | Draining of the Accessory Gearbox (AGB) |
| TASK 12-13-79-610-805-A | Check of the Oil Level and Replenishing |
| TASK 12-13-79-610-808-A | Draining of the Oil Tank |
| TASK 71-00-00-700-805-A | Dry-Motoring Check |
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-803-A | Closing of the Fan Cowl Doors |
| TASK 72-00-00-290-814-A | Borescope Inspection of the Stage 1 High Pressure Turbine (HPT) Nozzle Guide Vanes |
| TASK 72-30-00-290-801-A | Borescope Inspection of the High Pressure Compressor Section |
| TASK 72-40-00-290-801-A | Borescope Inspection of Combustion Section and Fuel Nozzles |
| TASK 72-52-00-290-803-A | Borescope Inspection of High Pressure Turbine |
| TASK 73-21-15-210-801-A | Visual Inspection of the T12 Sensor |
| TASK 78-30-00-040-809-A | Deactivation of the Thrust Reverser System for Ground Maintenance |
| TASK 78-30-00-440-809-A | Reactivation of the Thrust Reverser System after Ground Maintenance |
| TASK 78-36-00-010-806-A | Opening of the Thrust Reverser Cowl Doors |
| TASK 78-36-00-410-806-A | Closing of the Thrust Reverser Cowl Doors |
| TASK 79-21-05-000-803-A | Removal of the Oil Filter Cartridge |
| TASK 79-21-05-400-803-A | Installation of the Oil Filter Cartridge |
Subtask 72-00-00-941-228-A
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 72-00-00-010-312-A (1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:
- The ENG/MODE selector switch
- The ENG/MASTER 1(2) control switch.
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.
Subtask 72-00-00-040-153-A (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.
C. Deactivation of the Thrust Reverser System for Maintenance
Subtask 72-00-00-010-313-A WARNING:
YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809). D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
4. Procedure(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
CAUTION:
DO NOT WATER-WASH AN ENGINE THAT HAS BEEN EXPOSED TO VOLCANIC ASH, DUST OR SAND. PARTICLES CAN ACCUMULATE IN THE COMBUSTOR LINERS, HPT NOZZLE VANES AND HPT BLADE COOLING PATHS. MATERIAL CAN ACCUMULATE IN THE HPC ROTOR SPOOLS AND CAUSE ROTOR IMBALANCE.
Subtask 72-00-00-280-087-A A. Volcanic Ash, Dust or Sand Ingestion
(1) The following requirements are subsequent to incidents of engines flown or operated in volcanic ash, dust or sand:
(a) Visually check engine inlet and exhaust areas for evidence of damage or excessive erosion.
(b) Borescope inspect the High Pressure Compressor (HPC), combustor and High Pressure Turbine (HPT) for evidence of the following (Ref. AMM TASK 72-30-00-290-801), (Ref. AMM TASK 72-00-00-290-814), (Ref. AMM TASK 72-52-00-290-803) and (Ref. AMM TASK 72-40-00-290-801):
2 Foreign Object Damage (FOD).
3 Build-up of ash, dust or sand deposits that have solidified on the combustor liners, HPT nozzle vanes and HPT blades.
a If material has solidified on the combustor liners HPT vanes or blades, contact CFM.
(c) Oil System:
1 Replace scavenge oil filter (Ref. AMM TASK 79-21-05-000-803) and (Ref. AMM TASK 79-21-05-400-803).
2 Drain the oil (Ref. AMM TASK 12-13-79-610-808) and (Ref. AMM TASK 12-13-79-610-802).
3 Flush accessory and transfer gearbox (Ref. AMM TASK 12-13-79-610-802).
4 Replace the oil (Ref. AMM TASK 12-13-79-610-805).
(d) Monitor engine operation to determine if a shift in performance parameters has occurred. If parameters are abnormal, do the related troubleshooting procedure (TSM Chapter 77).
(e) Check for proper cooling of ignition leads.
(f) Check condition of T12 temperature sensor (Ref. AMM TASK 73-21-15-210-801).
(g) Check for fouling of Active Clearance Control (ACC) inlet louver.
(2) The following requirements are subsequent to incidents of engines NOT flown or operated in volcanic ash, dust or sand, but have been exposed to volcanic ash, dust or sand on the ground:
(a) Do an inspection of the engine inlet and exhaust for accumulation of ash, dust or sand particles.
1 Vacuum any particles from accessible areas of the inlet and exhaust.
2 Dry motor the engine for two minutes (Ref. AMM TASK 71-00-00-700-805).
3 Borescope the HPC, combustor and HPT to inspect for ash, dust or sand (Ref. AMM TASK 72-52-00-290-803), (Ref. AMM TASK 72-00-00-290-814), (Ref. AMM TASK 72-52-00-290-803) and (Ref. AMM TASK 72-40-00-290-801).
4 If loose material is still present in the engine flow path, dry motor the engine for two more minutes.
5 Repeat the borescope inspection and dry motoring until all material has been removed.
(3) Do a one-time repeat borescope inspection at an A-check or 400-800 cycles to ensure HPT nozzle vane and HPT blade integrity.
5. Close-up(1) The following requirements are subsequent to incidents of engines flown or operated in volcanic ash, dust or sand:
(a) Visually check engine inlet and exhaust areas for evidence of damage or excessive erosion.
(b) Borescope inspect the High Pressure Compressor (HPC), combustor and High Pressure Turbine (HPT) for evidence of the following (Ref. AMM TASK 72-30-00-290-801), (Ref. AMM TASK 72-00-00-290-814), (Ref. AMM TASK 72-52-00-290-803) and (Ref. AMM TASK 72-40-00-290-801):
NOTE: Do an inspection of all stages of the HPC. The aft stages of the HPC will be most affected by erosion.
NOTE: Do an inspection of the combustor liners, HPT nozzle vanes and the HPT blades for erosion and accumulation of solidified material. Sufficient amounts of material accumulation on the HPT nozzle vanes can cause a reduced engine stall margin.
1 Excessive erosion. 2 Foreign Object Damage (FOD).
3 Build-up of ash, dust or sand deposits that have solidified on the combustor liners, HPT nozzle vanes and HPT blades.
a If material has solidified on the combustor liners HPT vanes or blades, contact CFM.
(c) Oil System:
1 Replace scavenge oil filter (Ref. AMM TASK 79-21-05-000-803) and (Ref. AMM TASK 79-21-05-400-803).
2 Drain the oil (Ref. AMM TASK 12-13-79-610-808) and (Ref. AMM TASK 12-13-79-610-802).
3 Flush accessory and transfer gearbox (Ref. AMM TASK 12-13-79-610-802).
4 Replace the oil (Ref. AMM TASK 12-13-79-610-805).
(d) Monitor engine operation to determine if a shift in performance parameters has occurred. If parameters are abnormal, do the related troubleshooting procedure (TSM Chapter 77).
(e) Check for proper cooling of ignition leads.
(f) Check condition of T12 temperature sensor (Ref. AMM TASK 73-21-15-210-801).
(g) Check for fouling of Active Clearance Control (ACC) inlet louver.
(2) The following requirements are subsequent to incidents of engines NOT flown or operated in volcanic ash, dust or sand, but have been exposed to volcanic ash, dust or sand on the ground:
(a) Do an inspection of the engine inlet and exhaust for accumulation of ash, dust or sand particles.
1 Vacuum any particles from accessible areas of the inlet and exhaust.
2 Dry motor the engine for two minutes (Ref. AMM TASK 71-00-00-700-805).
3 Borescope the HPC, combustor and HPT to inspect for ash, dust or sand (Ref. AMM TASK 72-52-00-290-803), (Ref. AMM TASK 72-00-00-290-814), (Ref. AMM TASK 72-52-00-290-803) and (Ref. AMM TASK 72-40-00-290-801).
4 If loose material is still present in the engine flow path, dry motor the engine for two more minutes.
5 Repeat the borescope inspection and dry motoring until all material has been removed.
(3) Do a one-time repeat borescope inspection at an A-check or 400-800 cycles to ensure HPT nozzle vane and HPT blade integrity.
Subtask 72-00-00-410-269-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
Subtask 72-00-00-440-144-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).
Subtask 72-00-00-410-270-A