DOC AIRBUS | AMM A320FInspection after Flight Through Volcanic Ash [IAE]
TASK 72-00-00-200-020-A
Inspection after Flight Through Volcanic Ash
1. Reason for the Job
The quantity of volcanic ash that goes in to an engine (ingestion) and its effects on engine operation can be very different. Light ingestion can go undetected whereas heavy ingestion can cause engine operational problems and engine shutdown. It is not possible to address all quantities of ingestion in one inspection procedure because of these differences. Thus, the inspections and procedures that follow are for volcanic ash ingestion at three levels : heavy, medium and light. Use the guidelines that follow to make a decision about the level of volcanic ash ingestion by an engine.
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 72-00-00-941-088-A ** ON A/C NOT FOR ALL
Subtask 72-00-00-210-078-A ** ON A/C NOT FOR ALL
Subtask 72-00-00-410-101-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 04:08:16 UTC
Inspection after Flight Through Volcanic Ash
1. Reason for the Job
The quantity of volcanic ash that goes in to an engine (ingestion) and its effects on engine operation can be very different. Light ingestion can go undetected whereas heavy ingestion can cause engine operational problems and engine shutdown. It is not possible to address all quantities of ingestion in one inspection procedure because of these differences. Thus, the inspections and procedures that follow are for volcanic ash ingestion at three levels : heavy, medium and light. Use the guidelines that follow to make a decision about the level of volcanic ash ingestion by an engine.
- Heavy (see Paragraph 4.A.):
The engine had operational problems and could have shutdown in flight.
You can see volcanic ash everywhere.
The inlet cowl leading edge shows pitting and erosion. The inlet cone fiberglass material shows because the paint has eroded. The fan blades are dull gray and have a rough texture. The aircraft leading edges show dulling and pitting. The aircraft windshield can be completely pitted. - Medium (see Paragraph 4.B.):
The engine possibly had operational problems such as a surge or a sudden decrease in EPR, N1, N2 and fuel flow or a sudden increase in EGT.
Volcanic ash can be seen and has collected in the corners and recesses of the inlet cowl so that the ash has a depth you can measure.
The inlet cowl leading edge looks dull when compared to the outside of the inlet. The inlet cone could have lost paint and the fan blades could show signs of dulling. The aircraft windshield can have some pitting. - Light (see Paragraph 4.T.):
It is possible but not sure that the engine actually ingested volcanic ash. There were no engine operational problems.
There are possibly small quantities of ash in the corners and recesses of the inlet or the nacelle.
You cannot see any erosion of the inlet cowl leading edge, inlet cone or fan blades. The aircraft leading edges and windshield show no signs or erosion.
NOTE: For light ingestion, a borescope inspection of only one engine is necessary. If there are findings, both engines must be inspected.
If you are not sure which level of inspection to do, it is best to go to the next higher level of inspection. You can contact your IAE representative for assistance. NOTE: An engine can return to service only if it passes all of the inspections and procedures that follow. The inspections must be done in the sequence that is given. When you find a cause to reject the engine, no more inspections need to be done. If you find anything unusual, tell your IAE representative.
NOTE: Engine water wash is not recommended for the specific procedure of removing volcanic ash.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V01-339) | alkali cleaner |
| (Material No.V01-340) | alkali cleaner |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-13-79-610-010-A | Drain the Engine Oil System |
| TASK 12-13-79-610-011-A | Check Oil Level and Replenish |
| TASK 30-21-51-000-010-B | Removal of the Engine Air Intake Anti-ice Valve |
| TASK 30-21-51-400-010-B | Installation of the Engine Air Intake Anti-ice Valve |
| TASK 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 72-00-00-200-013-B | Borescope Inspection of inside of Combustion Chamber and HP turbine stage 1 Vanes |
| TASK 72-00-00-200-014-B | Borescope Inspection of the Stage 1 High Pressure Turbine (HPT) Blades and Duct Segments |
| TASK 72-00-00-200-014-B-01 | Borescope Inspection of the Stage 1 High Pressure Turbine (HPT) Blades and Duct Segments |
| TASK 72-00-00-200-015-B | Borescope Inspection of the Stage 2 High Pressure Turbine (HPT) Blades and Duct Segments |
| TASK 72-00-00-200-016-B | Inspection of the HP Compressor |
| TASK 72-00-00-200-016-B-01 | Inspection of the HP Compressor |
| TASK 72-31-11-100-010-A | Cleaning of the LP Compressor Blades |
| TASK 72-31-11-200-010-B | Inspection of the Low Pressure (LP) Compressor Fan Blades |
| TASK 72-38-11-200-010-B | Inspection of the Inlet Cone and the Inlet Cone Fairing |
| TASK 73-12-42-000-010-B | Removal of the Fuel Filter Element |
| TASK 73-12-42-920-010-A | Remove, Inspect for Contamination and Replace Main Fuel Filter |
| TASK 73-13-41-000-010-A | Removal of the Fuel Nozzle |
| TASK 73-13-41-400-010-A | Installation of the Fuel Nozzle |
| TASK 73-22-11-000-010-A | Removal of the P2/T2 Sensor |
| TASK 73-22-11-400-010-A | Installation of the P2/T2 Sensor |
| TASK 73-22-15-000-010-A | Removal of the P3/T3 Sensor |
| TASK 73-22-15-400-010-A | Installation of the P3/T3 Sensor |
| TASK 73-22-34-000-010-A | Removal of the Electronic Engine Control (EEC) |
| TASK 73-22-34-400-010-A | Installation of the Electronic Engine Control (EEC) |
| TASK 75-23-51-000-010-B | Removal of the Stage 10 to HPT Air Control Valve |
| TASK 75-23-51-400-010-B | Installation of the Stage 10 to HPT Air Control Valve |
| TASK 75-24-51-000-010-B | Removal of the HPT/LPT ACC Air Valve |
| TASK 75-24-51-400-010-B | Installation of the HPT/LPT ACC Air Valve |
| TASK 75-32-52-000-010-A | Removal of the HPC Stage 7 Bleed Valve - Upper Right |
| TASK 75-32-52-000-011-A | Removal of the HPC Stage 7 Bleed Valve - Lower Right |
| TASK 75-32-52-000-012-A | Removal of the HPC Stage 7 Bleed Valve - Lower Left |
| TASK 75-32-52-400-010-A | Installation of the HPC Stage 7 Bleed Valve - Upper Right |
| TASK 75-32-52-400-011-A | Installation of the HPC Stage 7 Bleed Valve - Lower Right |
| TASK 75-32-52-400-012-A | Installation of the HPC Stage 7 Bleed Valve - Lower Left |
| TASK 75-32-54-000-010-A | Removal of the HPC Stage 10 Bleed Valve |
| TASK 75-32-54-400-010-A | Installation of the HPC Stage 10 Bleed Valve |
| TASK 78-30-00-040-012-A | Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance |
| TASK 78-30-00-440-012-A | Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance |
| TASK 78-32-00-010-010-A | Opening of the Thrust Reverser Halves |
| TASK 78-32-00-410-010-A | Closing of the Thrust Reverser Halves |
| TASK 79-00-00-200-011-A | Inspection of the Magnetic Chip Detectors for Debris |
| TASK 79-00-00-200-012-A | Inspection of the Oil Filters |
| TASK 79-21-42-000-010-A | Removal of the Air Cooled Oil Cooler (ACOC) |
| TASK 79-21-42-400-010-A | Installation of the Air Cooled Oil Cooler (ACOC) |
| TASK 79-21-44-000-010-A | Removal of the Pressure Oil Filter Element |
| TASK 79-22-44-000-010-A | Removal of the Scavenge Oil Filter Element |
| TASK 79-22-45-000-010-A | Removal of the Magnetic Chip Detector |
Subtask 72-00-00-941-088-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 72-00-00-010-102-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. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in to position.
Subtask 72-00-00-040-074-A ** ON A/C NOT FOR ALL (1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in to position.
C. Deactivate the thrust reverser.
Subtask 72-00-00-010-113-A ** ON A/C NOT FOR ALL WARNING:
MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(1) Deactivate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-040-012). D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(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 72-00-00-210-078-A ** ON A/C NOT FOR ALL
A. Heavy Ingestion Inspection.
(1) If the engine ingested heavy quantities of volcanic ash, reject the engine.
Subtask 72-00-00-210-079-A ** ON A/C NOT FOR ALL (1) If the engine ingested heavy quantities of volcanic ash, reject the engine.
B. Medium Ingestion Inspection.
(1) Check the parameters of operation at the time of ingestion for sudden changes.
(a) If there were sudden changes, but operational limits were not exceeded, continue with the inspections.
(b) If there were sudden changes and operational limits were exceeded, reject the engine.
Subtask 72-00-00-290-069-B ** ON A/C NOT FOR ALL (1) Check the parameters of operation at the time of ingestion for sudden changes.
(a) If there were sudden changes, but operational limits were not exceeded, continue with the inspections.
(b) If there were sudden changes and operational limits were exceeded, reject the engine.
C. Do a borescope inspection.
(1) Start with borescope inspection of the stage 1 HPT vanes then the combustion chamber and the fuel nozzles (Ref. AMM TASK 72-00-00-200-013). Look for blockage of the cooling holes and for material that bonds to the vanes.
(2) Do a borescope inspection of the stage 1 HPT blades (Ref. AMM TASK 72-00-00-200-014). Look for blockage of the cooling holes and for material that bonds to the blades.
(3) Do a borescope inspection of the stage 2 HPT blades (Ref. AMM TASK 72-00-00-200-015). Look for blockage of the cooling holes.
(4) Do a borescope inspection of the HP compressor (Ref. AMM TASK 72-00-00-200-016). Look for compressor blade deposits and leading edge tip erosion.
(5) If you can see volcanic ash contamination on the turbine or HP compressor airfoils, reject the engine.
Subtask 72-00-00-020-054-A ** ON A/C NOT FOR ALL (1) Start with borescope inspection of the stage 1 HPT vanes then the combustion chamber and the fuel nozzles (Ref. AMM TASK 72-00-00-200-013). Look for blockage of the cooling holes and for material that bonds to the vanes.
(2) Do a borescope inspection of the stage 1 HPT blades (Ref. AMM TASK 72-00-00-200-014). Look for blockage of the cooling holes and for material that bonds to the blades.
(3) Do a borescope inspection of the stage 2 HPT blades (Ref. AMM TASK 72-00-00-200-015). Look for blockage of the cooling holes.
(4) Do a borescope inspection of the HP compressor (Ref. AMM TASK 72-00-00-200-016). Look for compressor blade deposits and leading edge tip erosion.
(5) If you can see volcanic ash contamination on the turbine or HP compressor airfoils, reject the engine.
NOTE: Volcanic ash melts as it goes through the combustor. The melted ash will build up on the airfoil concave side of the stage 1 vanes and will be a dull color. It can cause a blockage of the stage 1 vane cooling holes so that only indentations show on the surface. Volcanic ash will also build up on the airfoil concave and convex side of the stage 1 turbine blades, but not as heavy as the stage 1 vanes.
D. Remove the pressure and scavenge oil filter elements (Ref. AMM TASK 79-21-44-000-010) and (Ref. AMM TASK 79-22-44-000-010).
Subtask 72-00-00-210-080-A ** ON A/C NOT FOR ALL E. Do an inspection of the filter elements (Ref. AMM TASK 79-00-00-200-012).
(1) If you find volcanic ash contamination, reject the engine.
Subtask 72-00-00-020-062-A ** ON A/C NOT FOR ALL (1) If you find volcanic ash contamination, reject the engine.
NOTE: Volcanic ash build-up in the oil filters looks muddy.
(2) If the contamination is other than volcanic ash, continue the inspection (Ref. AMM TASK 79-00-00-200-012). F. Removal of the Stage 7, Stage 10 Bleed Valves and the Stage 10 to HPT Air Valve:
(1) Remove the stage 7 and stage 10 bleed valves (Ref. AMM TASK 75-32-52-000-010), (Ref. AMM TASK 75-32-52-000-011), (Ref. AMM TASK 75-32-52-000-012) and (Ref. AMM TASK 75-32-54-000-010).
(2) Remove the stage 10 to HPT air valve (Ref. AMM TASK 75-23-51-000-010).
Subtask 72-00-00-210-081-A ** ON A/C NOT FOR ALL (1) Remove the stage 7 and stage 10 bleed valves (Ref. AMM TASK 75-32-52-000-010), (Ref. AMM TASK 75-32-52-000-011), (Ref. AMM TASK 75-32-52-000-012) and (Ref. AMM TASK 75-32-54-000-010).
(2) Remove the stage 10 to HPT air valve (Ref. AMM TASK 75-23-51-000-010).
G. Examine the stage 7 and stage 10 bleed valves and the stage 10 to HPT air valve for contamination.
(1) If you find contamination, replace the stage 7 and stage 10 bleed valves (Ref. AMM TASK 75-32-52-400-010) (Ref. AMM TASK 75-32-52-400-011), (Ref. AMM TASK 75-32-52-400-012) and (Ref. AMM TASK 75-32-54-400-010).
(2) If you find contamination, replace the stage 10 to HPT air valve (Ref. AMM TASK 75-23-51-400-010).
Subtask 72-00-00-210-082-A ** ON A/C NOT FOR ALL (1) If you find contamination, replace the stage 7 and stage 10 bleed valves (Ref. AMM TASK 75-32-52-400-010) (Ref. AMM TASK 75-32-52-400-011), (Ref. AMM TASK 75-32-52-400-012) and (Ref. AMM TASK 75-32-54-400-010).
(2) If you find contamination, replace the stage 10 to HPT air valve (Ref. AMM TASK 75-23-51-400-010).
H. Examination:
(1) Examine the Air Cooled Oil Cooler (ACOC) screen for contamination.
(a) If you find contamination, replace the ACOC (Ref. AMM TASK 79-21-42-000-010) and (Ref. AMM TASK 79-21-42-400-010).
(2) Examine the P3/T3 probe and the P2/T2 probe for contamination or erosion or both.
(a) Replace the P3/T3 probe if you find contamination or erosion (Ref. AMM TASK 73-22-15-000-010) and (Ref. AMM TASK 73-22-15-400-010).
(b) Replace the P2/T2 probe if you find contamination or erosion (Ref. AMM TASK 73-22-11-000-010) and (Ref. AMM TASK 73-22-11-400-010).
Subtask 72-00-00-210-083-A ** ON A/C NOT FOR ALL (1) Examine the Air Cooled Oil Cooler (ACOC) screen for contamination.
(a) If you find contamination, replace the ACOC (Ref. AMM TASK 79-21-42-000-010) and (Ref. AMM TASK 79-21-42-400-010).
(2) Examine the P3/T3 probe and the P2/T2 probe for contamination or erosion or both.
(a) Replace the P3/T3 probe if you find contamination or erosion (Ref. AMM TASK 73-22-15-000-010) and (Ref. AMM TASK 73-22-15-400-010).
(b) Replace the P2/T2 probe if you find contamination or erosion (Ref. AMM TASK 73-22-11-000-010) and (Ref. AMM TASK 73-22-11-400-010).
I. Examination:
(1) Examine the P2, Pb, P5, P2.5 and P12.5 pressure lines for contamination.
(a) If the pressure lines are contaminated, clean them with filtered air at 50 psig (344,7 kPa) maximum pressure.
(2) Examine the P2, Pb, P5, P2.5, P12.5 and Pamb ports on the Electronic Engine Control (EEC) for contamination.
(a) If any of the ports show signs of contamination, replace the EEC (Ref. AMM TASK 73-22-34-000-010) and (Ref. AMM TASK 73-22-34-400-010).
Subtask 72-00-00-210-084-A ** ON A/C NOT FOR ALL (1) Examine the P2, Pb, P5, P2.5 and P12.5 pressure lines for contamination.
(a) If the pressure lines are contaminated, clean them with filtered air at 50 psig (344,7 kPa) maximum pressure.
(2) Examine the P2, Pb, P5, P2.5, P12.5 and Pamb ports on the Electronic Engine Control (EEC) for contamination.
(a) If any of the ports show signs of contamination, replace the EEC (Ref. AMM TASK 73-22-34-000-010) and (Ref. AMM TASK 73-22-34-400-010).
J. Examination:
(1) Examine the Active Clearance Control (ACC) valve for contamination.
(a) If you find contamination, remove and clean the ACC valve (Ref. AMM TASK 75-24-51-000-010) and (Ref. AMM TASK 75-24-51-400-010).
Subtask 72-00-00-210-085-A ** ON A/C NOT FOR ALL (1) Examine the Active Clearance Control (ACC) valve for contamination.
(a) If you find contamination, remove and clean the ACC valve (Ref. AMM TASK 75-24-51-000-010) and (Ref. AMM TASK 75-24-51-400-010).
K. Do a visual inspection of the thrust reverser.
(a) Mask all openings to the interior of the engine (that is, the inlet, exhaust, all bleeds, fuel and oil lines left open, breather tubes, and open electrical connectors).
(b) Make up an aqueous solution at a concentration of 25 percent by volume of alkali cleaner (Material No.V01-339) or alkali cleaner (Material No.V01-340)
(d) Leave the solution for between 10 and 20 minutes.
(e) Rinse the internal and external surfaces with warm or hot water.
(f) Air dry the internal and external surfaces fully to remove water.
(g) Remove the masking. Discard all unused solution.
Subtask 72-00-00-210-086-A ** ON A/C NOT FOR ALL CAUTION:
IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURERS MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION.
(1) If you find contaminaton do the following: (a) Mask all openings to the interior of the engine (that is, the inlet, exhaust, all bleeds, fuel and oil lines left open, breather tubes, and open electrical connectors).
(b) Make up an aqueous solution at a concentration of 25 percent by volume of alkali cleaner (Material No.V01-339) or alkali cleaner (Material No.V01-340)
- Fill the tank with clean cold water to 50 percent of the operating level.
- Slowly and carefully add the specified quantity of alkali cleaner. Stir to mix.
- Fill the tank with wather to 100 percent of the operating level, and stir to mix.
(d) Leave the solution for between 10 and 20 minutes.
(e) Rinse the internal and external surfaces with warm or hot water.
(f) Air dry the internal and external surfaces fully to remove water.
(g) Remove the masking. Discard all unused solution.
L. Examination:
(1) Examine the engine air intake anti-ice valve for contamination.
(a) If you find contamination, remove and clean the anti-ice valve (Ref. AMM TASK 30-21-51-000-010) and (Ref. AMM TASK 30-21-51-400-010).
(2) Examine the fan area, fan blades, inlet cone and inlet fairing for contamination (Ref. AMM TASK 72-31-11-200-010) and (Ref. AMM TASK 72-38-11-200-010).
(3) If you find contamination, clean as necessary. Clean the fan blades by hand (Ref. AMM TASK 72-31-11-100-010).
Subtask 72-00-00-020-060-A ** ON A/C NOT FOR ALL Subtask 72-00-00-210-087-A ** ON A/C NOT FOR ALL (1) Examine the engine air intake anti-ice valve for contamination.
(a) If you find contamination, remove and clean the anti-ice valve (Ref. AMM TASK 30-21-51-000-010) and (Ref. AMM TASK 30-21-51-400-010).
(2) Examine the fan area, fan blades, inlet cone and inlet fairing for contamination (Ref. AMM TASK 72-31-11-200-010) and (Ref. AMM TASK 72-38-11-200-010).
(3) If you find contamination, clean as necessary. Clean the fan blades by hand (Ref. AMM TASK 72-31-11-100-010).
NOTE: Engine water wash is not recommended for the specific purpose of removing volcanic ash.
N. Examine the fuel nozzles and replace them if there are ash deposits in the air passages (Ref. AMM TASK 73-13-41-400-010).
Subtask 72-00-00-020-061-A ** ON A/C NOT FOR ALL Subtask 72-00-00-210-088-A ** ON A/C NOT FOR ALL Subtask 72-00-00-680-050-A ** ON A/C NOT FOR ALL Q. If the engine passes all the inspections and procedures, drain the oil system then fill it again (Ref. AMM TASK 12-13-79-610-010) and (Ref. AMM TASK 12-13-79-610-011).
Subtask 72-00-00-020-056-A ** ON A/C NOT FOR ALL R. Light Ingestion Inspection.
(1) Remove the pressure and scavenge oil filter elements (Ref. AMM TASK 79-21-44-000-010) and (Ref. AMM TASK 79-22-44-000-010).
Subtask 72-00-00-210-089-A ** ON A/C NOT FOR ALL (1) Remove the pressure and scavenge oil filter elements (Ref. AMM TASK 79-21-44-000-010) and (Ref. AMM TASK 79-22-44-000-010).
S. Do an inspection of the filter elements (Ref. AMM TASK 79-00-00-200-012).
(1) If you find volcanic ash contamination, reject the engine.
Subtask 72-00-00-290-070-B ** ON A/C NOT FOR ALL (1) If you find volcanic ash contamination, reject the engine.
NOTE: Volcanic ash build-up in the oil filters looks muddy.
(2) If the contamination is other than volcanic ash, continue the inspection (Ref. AMM TASK 79-00-00-200-012). T. Do a borescope inspection.
(1) Start the borescope inspection of the stage 1 HPT vanes, then the combustion chamber and the fuel nozzles (Ref. AMM TASK 72-00-00-200-013). Look for blockage of the cooling holes and for material that bonds to the vanes.
(2) Do a borescope inspection of the stage 1 HPT blades (Ref. AMM TASK 72-00-00-200-014). Look for blockage of the cooling holes and for material that bonds to the blades.
(3) Do a borescope inspection of the stage 2 HPT blades (Ref. AMM TASK 72-00-00-200-015). Look for blockage of the cooling holes.
(4) Do a borescope inspection of the HP compressor (Ref. AMM TASK 72-00-00-200-016). Look for compressor blade deposits and leading edge tip erosion.
(5) If you can see volcanic ash contamination of the turbine or HP compressor airfoils, reject the engine.
Subtask 72-00-00-020-057-A ** ON A/C NOT FOR ALL Subtask 72-00-00-210-090-A ** ON A/C NOT FOR ALL (1) Start the borescope inspection of the stage 1 HPT vanes, then the combustion chamber and the fuel nozzles (Ref. AMM TASK 72-00-00-200-013). Look for blockage of the cooling holes and for material that bonds to the vanes.
(2) Do a borescope inspection of the stage 1 HPT blades (Ref. AMM TASK 72-00-00-200-014). Look for blockage of the cooling holes and for material that bonds to the blades.
(3) Do a borescope inspection of the stage 2 HPT blades (Ref. AMM TASK 72-00-00-200-015). Look for blockage of the cooling holes.
(4) Do a borescope inspection of the HP compressor (Ref. AMM TASK 72-00-00-200-016). Look for compressor blade deposits and leading edge tip erosion.
(5) If you can see volcanic ash contamination of the turbine or HP compressor airfoils, reject the engine.
NOTE: Volcanic ash melts as it goes through the combustor. The melted ash will build up on the airfoil concave side of the stage 1 vanes and will be a dull color. It can cause a blockage of the stage 1 vane cooling holes so that only indentations show on the surface. Volcanic ash will also build up on the airfoil concave and convex side of the stage 1 turbine blades, but not as heavy as the stage 1 vanes.
V. Examine the fuel filter element for volcanic ash contamination.
(1) If you find volcanic ash contamination, reject the engine and tell your IAE representative.
Subtask 72-00-00-210-091-A ** ON A/C NOT FOR ALL (1) If you find volcanic ash contamination, reject the engine and tell your IAE representative.
NOTE: Experience with volcanic ash ingestion has shown the fuel system to be free of contamination.
(2) If there is contamination other than volcanic ash, replace the fuel filter element (Ref. AMM TASK 73-12-42-920-010). W. Do a visual inspection of the thrust reverser.
(a) Mask all openings to the interior of the engine (that is, the inlet, exhaust, all bleeds, fuel and oil lines left open, breather tubes, and open electrical connectors).
(b) Make up an aqueous solution at a concentration of 25 percent by volume of alkali cleaner (Material No.V01-339) or alkali cleaner (Material No.V01-340) .
(d) Leave the solution for between 10 and 20 minutes.
(e) Rinse the internal and external surfaces with warm or hot water.
(f) Air dry the internal and external surfaces fully to remove water.
(g) Remove the masking. Discard all unused solution.
Subtask 72-00-00-210-092-A ** ON A/C NOT FOR ALL CAUTION:
IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURERS MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION.
(1) If you find contamination do the following: (a) Mask all openings to the interior of the engine (that is, the inlet, exhaust, all bleeds, fuel and oil lines left open, breather tubes, and open electrical connectors).
(b) Make up an aqueous solution at a concentration of 25 percent by volume of alkali cleaner (Material No.V01-339) or alkali cleaner (Material No.V01-340) .
- Fill the tank with clean cold water to 50 percent of the operating level.
- Slowly and carefully add the specified quantity of alkali cleaner. Stir to mix.
- Fill the tank with water to 100 percent of the operating level, and stir to mix.
(d) Leave the solution for between 10 and 20 minutes.
(e) Rinse the internal and external surfaces with warm or hot water.
(f) Air dry the internal and external surfaces fully to remove water.
(g) Remove the masking. Discard all unused solution.
X. Examine the engine air intake anti-ice valve for contamination.
(1) If you find contamination, remove and clean the anti-ice valve (Ref. AMM TASK 30-21-51-000-010) and (Ref. AMM TASK 30-21-51-400-010).
Subtask 72-00-00-020-058-A ** ON A/C NOT FOR ALL Subtask 72-00-00-210-093-A ** ON A/C NOT FOR ALL (1) If you find contamination, remove and clean the anti-ice valve (Ref. AMM TASK 30-21-51-000-010) and (Ref. AMM TASK 30-21-51-400-010).
Z. Examine the MCDs (Ref. AMM TASK 79-00-00-200-011).
5. Close-upNOTE: Engine water wash is not recommended for the specific procedure of removing volcanic ash.
Subtask 72-00-00-410-101-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) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 72-00-00-440-073-A ** ON A/C NOT FOR ALL Subtask 72-00-00-410-130-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR