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 NOTE : This procedure will not correct all APU problems. You must do the
____ correct trouble-shooting procedures before the compressor is cleaned.
 Complete these tasks after contamination of the engine with:
 -fuel,
 -corrosive materials.
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
 No specific blanking plug
 No specific circuit breaker(s) safety clip(s)
 No specific compressor cleaning device
 No specific handpump
 No specific warning notice
 No specific access platform 3.5 m (11 ft. 6 in.)
 No specific Torque Wrench : range 0.00 to 1.20 m.daN

 (0.00
 to 9.00 lbf.ft)
 98A49007625001 1 DEVICE - CLEANING, APU

 B.
 Consumable Materials

 

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 11-013  USA MIL-PRF-85704 COMPRESSOR CLEANING (Ref. 20-31-00)
 C. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
23-44-00-860-001 Operation of the Service Interphone System 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action 29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through
 the Ground Connector 31-36-00-740-010 Printout of Stored Reports 49-00-00-860-003 APU Start by External Power (GTCP 36-300) 49-00-00-860-004 APU Shutdown by External Power (GTCP 36-300) 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access 49-20-00-991-004 Fig. 701 49-20-00-991-003 Fig. 702
 3. Job Set-up
__________
 Subtask 49-20-00-860-056
 A. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 (2)
 Put a warning notice in the cockpit to tell persons not to start the APU during Installation/Removal of the cleaning device.

 (3)
 Make sure that hydraulic systems are depressurized
 (Ref. TASK 29-00-00-864-001).

 (4)
 Connect the service interphone to the aircraft (Ref. TASK 23-44-00-860-001).

 

 Subtask 49-20-00-865-052
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
 Subtask 49-20-00-010-054
 C. Get Access
 (1)
 Put the access platform below the APU access doors 316AR and 315AL.

 (2)
 Open the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).

 (3)
 Set the LIGHT SW 11LJ to the ON position.

 4. Procedure
_________ Subtask 49-20-00-020-060
 A. Disconnect the Bleed Air Duct (8049KM) (3).
 (Ref. Fig. 701/TASK 49-20-00-991-004)

 (1)
 Remove the clamp (2).

 (2)
 Install the blanking plug on the bleed air duct (8049KM) (3). NOTE : Do not cover the flange of the APU load control valve (8050KM)

____
 (1).

 (3)
 Disconnect connector P12 from the Load Control Valve (8050KM).

 (4)
 Put blanking caps on the disconnected electrical connectors.

 

 Bleed Air Duct.
 Figure 701/TASK 49-20-00-991-004

 CES  Subtask 49-20-00-100-056

 B. Preparation and Cleaning
 (Ref. Fig. 702/TASK 49-20-00-991-003)

 (1)
 Install the DEVICE - CLEANING, APU to the APU with the mount assembly.

 (a)
 Install the mounting plate (14) on the APU rear lower mount boss with the knurled screw (15).

 (b)
 Attach the tube support assembly (16) to the mount plate (14) with the knurled screws (17).

 (c)
 Attach the sprayer unit (23) to the support assembly (16) with the clamp plate (22). Install the screws (18), washers (19) and
　
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