W DOC AIRBUS | AMM A320F

APU Load-Compressor Cleaning because of fluid ingestion (APS 3200)

TASK 49-20-00-100-003-A
APU Load-Compressor Cleaning because of fluid ingestion (APS 3200)

WARNING: WAIT A MINIMUM OF 1 HOUR AFTER THE APU SHUTDOWN TO LET THE INTERNAL TEMPERATURE DECREASE TO BETWEEN 55 AND 60 DEG. THERE IS A RISK OF BURNS IF YOU APPLY CLEANING FLUID WHEN THE APU IS TOO HOT.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
WARNING: BEFORE YOU INSTALL/REMOVE THE GSE TOOL, READ THE MANUFACTURER'S INSTRUCTIONS, AND, WHILE YOU OPERATE THIS TOOL, CAREFULLY OBEY THEM. IF YOU DO NOT DO THIS, INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.
WARNING: DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).
WARNING: LOCK THE MECHANISM OF THE ACCESS DOOR 316AR WITH THE PIP PIN WHEN YOU OPEN THE ACCESS DOOR. THIS WILL PREVENT INJURY.
CAUTION: DO NOT START THE APU WITH ACCESS DOORS 315AL AND 316AR OPEN/REMOVED. THE APU FIRE EXTINGUISHER SYSTEM IS NOT SUFFICIENT TO EXTINGUISH A FIRE IF THE ACCESS DOORS 315AL AND 316AR ARE OPEN/REMOVED.
ZONE: 315
ZONE: 316
1. Reason for the Job
APU Load Compressor cleaning as a result of fluid ingestion from Aircraft/APU leaks that goes into the APU inlet.
NOTE: This procedure will not correct all APU problems. You must do the correct trouble-shooting procedures before the Load Compressor is cleaned.
Complete these tasks after contamination of the engine with:
  • fuel,
  • corrosive materials.
  • oils.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific
AR
CAP - BLANKING
No specific
AR
CONTAINER 1 L (1/4 USGAL)
No specific
AR
PLUG - BLANKING
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WATER - DEIONIZED
No specific
AR
WATER - DISTILLED
No specific
Torque wrench: range to between 0.495 and 0.405 m.daN (43.81 and 35.84 lbf.in ) T
No specific
Torque wrench: range to between 1.13 and 1.02 m.daN (100.00 and 90.27 lbf.in ) T
No specific
Torque wrench: range to between 5.31 and 4.85 m.daN (39.16 and 35.77 lbf.ft ) T
98A28007570000
1
ADAPTER - VENT AND DRAIN VALVE, APU
98A49007625001
1
DEVICE - CLEANING, APU
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.03ABA1)
Synthetic base Lubricating Oil-Turbine Engine - -
(Material No.03ABB1)
Synthetic base Lubricating Oil-Turbine Engine Low Temp. -
(Material No.03FAB1)
Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.08AJA1)
Aqueous Cleaner-Turbine Engine Gas Path - -
(Material No.08AJA9)
Aqueous Cleaner-Turbine Engine Gas Path - Legacy
(Material No.08BBD1)
Non Aqueous Cleaner-- Isopropyl Alcohol -
(Material No.14QFC1)
Wire-Locking Dia: 0.8 mm CRES -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
315
TAIL CONE APU AND ACCESSORY COMPARTMENT
316
TAIL CONE APU AND ACCESSORY COMPARTMENT
315AL, 316AR
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
20
O-RING
AIPC 49-21-04-53-030
22
O-RING
AIPC 49-21-04-54-030
20
O-RING
AIPC 49-21-84-20-470
22
O-RING
AIPC 49-21-84-20-470
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 23-44-00-700-001-A
Operational Test of the Service Interphone
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A
Depressurization of the Hydraulic Reservoirs
TASK 49-00-00-710-008-A
Operational Test of the APU
TASK 49-16-00-210-805-A
General Visual Inspection of the APU Air Inlet Plenum and APU Air Intake (APS 3200)
TASK 52-41-00-010-001-A
Open the APU Doors for Access
TASK 52-41-00-410-001-A
Close the APU Doors after Access
F Cleaning Device - Installation
F APU - Fuel Vent and Drain Valve, Ignition Unit
F APU - Tube Assembly
3. Job Set-up
Subtask 49-20-00-860-062-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration.
   (1) Make sure that the hydraulic systems are depressurized (Ref. AMM TASK 29-14-00-614-001).
   (2) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
   (3) Make sure that the electronic racks are correctly ventilated.
   (4) Connect the service interphone to the aircraft (Ref. AMM TASK 23-44-00-700-001).
Subtask 49-20-00-865-085-A ** ON A/C NOT FOR ALL
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAPU/FUEL/BLOW OFF/PUMP2QCB14
121VUAPU/FUEL/BLOW OFF/CTL1QCK39
121VUAPU/FUEL/LP VALVE/CTL1QFM40
121VUAPU/FUEL/LP VALVE/SPLY2QFM39
121VUAPU/FUEL/PUMP/CTL3QCM38
Subtask 49-20-00-010-064-A ** ON A/C NOT FOR ALL
C. Get Access
   (1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the APU access doors 316AR and 315AL.
   (2) Open the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-010-001).
   (3) Set the LIGHT control switch 11LJ to the ON position.
4. Procedure
Subtask 49-20-00-860-066-A ** ON A/C NOT FOR ALL
A. APU System Maintenance Configuration
   (1) Disconnect the electrical connector P19 from the Fuel Control Unit.
   (2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
   (3) Drain and disconnect the Fuel Inlet Line
WARNING: OBEY THE FUEL SAFETY PROCEDURES.
CAUTION: PUT PLASTIC CAPS OR PLUGS ON ALL FUEL AND/OR LUBRICATION SYSTEM COMPONENTS AND LINES. IF YOU USE TAPE, CLOTH, OR METAL CAPS ON THEM, YOU CAN DAMAGE THE APU.
CAUTION: YOU MUST USE TWO WRENCHES AND HOLD THE COMPONENT WHEN YOU REMOVE/INSTALL THE PIPE COUPLINGS AND/OR UNIONS. THIS PREVENTS DAMAGE TO THE COMPONENT.
     (a) Put the CONTAINER 1 L (1/4 USGAL) in position below the fuel control unit and the vent and drain valve (12).
     (b) Remove the blanking cap (13) from the LP fuel inlet vent and drain valve (12).
     (c) Install the 98A28007570000 ADAPTER - VENT AND DRAIN VALVE, APU to the vent and drain valve (12).
     (d) Drain the unwanted fuel into the container.
     (e) Remove the 98A28007570000 ADAPTER - VENT AND DRAIN VALVE, APU from the vent and drain valve.
     (f) Install the blanking cap (13).
     (g) Remove and discard the lockwire and disconnect the fuel inlet line (14) from the vent and drain valve (12).
     (h) Put the PLUG-BLANKING in each disconnected line end.
     (i) Put the main fuel inlet-pipe in the stowage bracket attached to the firewall of the APU compartment.
     (j) Remove the container below the vent and drain valve (12).
   (4) Move the IGV Actuator Rod at the IGV position indicator from the closed end to the open end, to provide maximum access to load compressor for the cleaning mixture.
   (5) Disconnect the Power Compressor Discharge (PCD) lines as follows:
     (a) Remove the tube assembly (Pneu - Sensor PCD) (17) (Ref. AIPC 49-21-04-53-120).
     (b) Disconnect the tube assembly (Pneu - Duct to Sensor PCD) (23) (Ref. AIPC 49-21-04-54-170) from the Bleed Control Valve (BCV) port.
     (c) Put the PLUG-BLANKING in each disconnected line end.
     (d) Disconnect the tube assembly (Pneu - PCD to Gearbox) (18) (Ref. AIPC 49-21-04-53-010), from the combustor side.
     (e) Put the PLUG-BLANKING in each disconnected line end.
   (6) Disconnect the electrical connector P10 (16) from the Ignition Unit (15).
   (7) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
   (8) Install the 98A49007625001 DEVICE - CLEANING, APU:
     (a) Install the mounting plate (1) on the APU rear lower mount boss with the knurled screw (2).
     (b) Attach the tube support assembly (10) to the mount plate (1) with the knurled screws (3).
     (c) Clamp the sprayer unit (11) to the support assembly (10) with the clamp plate (9), the screws (4), the washers (5) and (6) and the nuts (7).
     (d) Rotate and adjust both spray nozzles (24) to spray only the APU load compressor. The APU power compressor must not be cleaned.
   (9) Prepare the cleaning mixture:
     (a) In the cleaning device container, prepare a mixture as follows:
Use Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) with Aqueous Cleaner-Turbine Engine Gas Path - Legacy (Material No.08AJA9) or Aqueous Cleaner-Turbine Engine Gas Path - - (Material No.08AJA1)
AMBIENT TEMPERATURE
CLEANING PRODUCT
WATER
ISOPROPYL ALCOHOL
over +5 deg C. (+41 deg F).
20%
80%
0%
-8 to +5 deg C. (+18 to +41 deg F).
16%
66%
18%
-24 to -8 deg C. (-11 to +18 deg F).
13%
54%
33%
     (b) Close the container and pressurize with compressed air as needed.

Subtask 49-20-00-160-050-A ** ON A/C NOT FOR ALL
CAUTION: MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT AVAILABLE. THE APU FIRE EXTINGUISHING SYSTEM IS NOT SUFFICIENT TO EXTINGUISH A FIRE IF THE ACCESS DOORS 315AL AND 316AR ARE OPEN/ REMOVED. KEEP OPERATION OF THE APU TO A MINIMUM WHEN THE ACCESS DOORS ARE OPEN/REMOVED.
B. Load Compressor wash
NOTE: APU run with open doors
  • make sure that the access platform can not move.
  • make sure that the fire fighting equipment and the necessary persons to monitor the start and operation of the APU are available.
  • make sure that no persons or loose equipment are in the danger areas.
   (1) On the C/B panel 121VU, make sure that these C/Bs are closed:
1KD.. APU/ECB/SPLY .... 41L;
2KD.. APU/APU/CTL ..... 42L.
   (2) On the overhead panel 25VU:
  • push the APU MASTER SW p/bsw,
  • push the APU START SW p/bsw to on.
   (3) When the APU starts to crank apply the cleaning fluid solution into the APU air inlet spraying only the APU load compressor with a flow rate of 3.0 l (0.7925 USgal)/per min to 3.5 l (0.9246 USgal)/per min.
NOTE: The recommended spray nozzle pressure is 2.8 bar (40.6106 psi) to 4.1 bar (59.4655 psi) at the recommended flow rate.
NOTE: The APU will crank to approx 15% speed and then decelerate to 0% speed.
   (4) Stop to apply the cleaning fluid solution at 0% speed.
   (5) Wait 15 minutes to allow cleaning fluid solution to soak.
   (6) Do steps 1 thru 4 again.
   (7) Flush the engine with WATER - DEIONIZED, if not available use WATER - DISTILLED.
   (8) Wait 5 minutes and flush engine again with deionized water, if not available use clean clear water.
Subtask 49-20-00-860-067-A ** ON A/C NOT FOR ALL
C. Put the system back to the serviceable condition.
   (1) Remove the cleaning device:
     (a) Disconnect and remove the sprayer (11) from the support assembly (10).
     (b) Remove the knurled screws (3) and remove the cleaning device.
     (c) Remove the knurled screw (2) and the mount plate (1) from the APU rear-lower mount-boss.
   (2) Remove the PLUG-BLANKING from each disconnected line end.
   (3) Connect electrical connector P10 (16) to the ignition exciter (15).
   (4) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) on the new AIPC 49-21-04-53-030 O-RING (20) or AIPC 49-21-84-20-470 O-RING (20).
   (5) Install the new O-ring (20) on the tube assembly (18).
   (6) Apply a thin layer of Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) on the screws (19).
   (7) Install the tube assembly (18) on the combustor side.
   (8) TORQUE the screws (19) to between 0.495 and 0.405 m.daN (43.81 and 35.84 lbf.in ) T.
   (9) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) on the new AIPC 49-21-04-54-030 O-RING (22) or AIPC 49-21-84-20-470 O-RING (22).
   (10) Install the new O-ring (22) on the tube assembly (23).
   (11) Apply a thin layer of Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) on the screws (21).
   (12) Install the tube assembly (23) on the BCV port.
   (13) TORQUE the screws (21) to between 0.495 and 0.405 m.daN (43.81 and 35.84 lbf.in ) T.
   (14) Install the tube assembly (17), and TORQUE to between 1.13 and 1.02 m.daN (100.00 and 90.27 lbf.in ) T.
   (15) Connect the fuel inlet line (14) to the vent and drain valve (12).
   (16) TORQUE the fuel inlet line (14) to between 5.31 and 4.85 m.daN (39.16 and 35.77 lbf.ft ) T.
WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
   (17) Safety the fuel inlet line (14) with the 14QFC1Wire-Locking Dia: 0.8 mm CRES -.
   (18) Push the IGV actuator rod to close the IGV's.
   (19) Connect electrical connector P19 to the fuel control unit.
Subtask 49-20-00-710-063-A ** ON A/C NOT FOR ALL
D. Operational Test
   (1) Do the operational test of the APU (Ref. AMM TASK 49-00-00-710-008), and run the APU for 5 minutes to make sure the APU is dry.
NOTE: During the wash procedure the following FAULT MESSAGES will be stored in ECB BITE Memory:
  • FUEL CTL UNIT P19
  • IGNITION UNIT P10
  • NO FLAME APU AUTO SHUTDOWN
Subtask 49-20-00-100-067-A ** ON A/C NOT FOR ALL
E. Inspection and cleaning of the APU inlet plenum
   (1) Make sure that the APU inlet plenum is clean and dry.
     (a) If you find contamination (Ref. AMM TASK 49-16-00-210-805).
5. Close-up
Subtask 49-20-00-410-066-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) Disconnect and remove the service interphone.
   (3) Set the LIGHT control switch 11LJ to the OFF position.
   (4) Close the APU access doors 315AL, 316AR (Ref. AMM TASK 52-41-00-410-001).
   (5) Remove the access platform(s).
Subtask 49-20-00-860-063-A ** ON A/C NOT FOR ALL
B. Aircraft Maintenance Configuration
   (1) Put the related hydraulic system in the pressurized configuration (Ref. AMM TASK 29-00-00-864-001).
   (2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
[Rev.10 from 2021] 2026.04.01 01:28:44 UTC
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