(2)
Open the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).
(3)
Set the LIGHT control switch 11LJ to the ON position.
4. Procedure
_________ (Ref. Fig. 701/TASK 49-20-00-991-009, 702/TASK 49-20-00-991-010, 703/TASK 49-20-00-991-011) Subtask 49-20-00-860-066
A. APU System Maintenance Configuration
(1)
Disconnect the electrical connector P19 from the Fuel Control Unit.
(2)
Put blanking caps on the disconnected electrical connectors.
(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.
Cleaning Device - Installation
Figure 701/TASK 49-20-00-991-009
CES
APU - Fuel Vent and Drain Valve, Ignition Unit
Figure 702/TASK 49-20-00-991-010
CES
APU - Tube Assembly
Figure 703/TASK 49-20-00-991-011
CES
(a)
Put the container 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 ADAPTER - VENT AND DRAIN VALVE, APU to the vent and drain valve (12).
(d)
Drain the unwanted fuel into the container.
(e)
Remove the 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 blanking plugs on the disconnected line ends.
(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) (Ref. AIPC
49210454170) (17).
(b)
Disconnect the tube assembly (Pneu - Duct to Sensor PCD) (Ref. AIPC 49210453120) (23) from the Bleed Control Valve (BCV) port.
(c)
Put blanking plugs on the disconnected line ends.
(d)
Disconnect the tube assembly (Pneu - PCD to Gearbox) (Ref. AIPC 49210453010) (18), from the combustor side.
(e)
Put blanking plugs on the disconnected line ends.
(6)
Disconnect the electrical connector P10 (16) from the Ignition Unit (15).
(7)
Put blanking caps on the disconnected electrical connectors.
(8)
Install the DEVICE - CLEANING, APU (98A49007625001):
(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)
Position the sprayer unit nozzles in the APU air intake as required.
(9)
Prepare the cleaning mixture:
WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL
_______ MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
(a) In the cleaning device container, prepare a mixture as follows: Use CLEANING AGENTS (Material No. 11-010) with CLEANING AGENTS (Material No. 11-013) or CLEANING AGENTS (Material No. 11-014)
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