(2)
Open the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).
(3)
Set the LIGHT control SW 11LJ to the ON position.
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CES Subtask 49-00-00-020-052
E. Prepare the APU for Purge.
(1)
Disconnect the electrical connector P10 from the ignition unit.
(2)
Put blanking caps on the disconnected electrical connectors.
(3)
Put the container below the primary fuel manifold.
(4)
Disconnect the primary fuel-feed pipe at the primary fuel manifold.
(5)
Make sure that the APU intake and exhaust blanking plugs are removed. Subtask 49-00-00-865-101
F.
Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.
4. Procedure
_________ Subtask 49-00-00-870-052
A. Fuel System Purge
(1)
On the panel 25VU, push the APU MASTER SW to the ON position.
(2)
On the panel 25VU, push the APU START switch to the ON position. NOTE : To cancel the motoring cycle, push the APU MASTER SW to the
____
OFF position.
(3)
The starter motor de-energizes after approximately 30 seconds.
(4)
Cancel the motoring cycle when the fuel flow from the disconnected fuel pipe is free of air and/or oil.
(5)
On the panel 25VU, push the APU MASTER SW to the OFF position.
R EFF : 001-049, 101-105, 107-107, 151-199, 49-00-00Page 505 201-210, Config-2 Aug 01/05
CES Subtask 49-00-00-865-102
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
5. Close-up
________ Subtask 49-00-00-420-052
A. Ignition Unit and Fuel System Reactivation
(1)
Connect the primary fuel-feed pipe at the primary fuel manifold.
(2)
Remove the waste fuel container.
(3)
Remove the blanking cap from the ignition unit.
(4)
Connect the electrical connector P10 to the ignition unit.
(5)
Make sure that the work area is clean and clear of tool(s) and other items.
Subtask 49-00-00-410-069
B. Close Access
(1)
Set the LIGHT control SW 11LJ to the OFF position.
(2)
Make sure that the work area is clean and clear of tool(s) and other items.
(3)
Close the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-410-001).
(4)
Remove the access platform(s). Subtask 49-00-00-865-103
C.
Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.
R EFF : 001-049, 101-105, 107-107, 151-199, 49-00-00Page 506 201-210, Config-2 Aug 01/05
CES Subtask 49-00-00-860-095
D. Aircraft Maintenance Configuration
(1)
Pressurize the reservoirs of the hydraulic systems.
(Ref. TASK 29-14-00-614-002).
(2)
De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
(3)
Remove the warning notice(s).
R EFF : 001-049, 101-105, 107-107, 151-199, 49-00-00Page 507 201-210, Config-2 Aug 01/05
CES TASK 49-00-00-710-010 Operational Test of the APU (131-9(A)) WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______ WHEN YOU DO THE MAINTENANCE TASK(S).
WARNING : WHILE THE APU OPERATES, DO NOT GO INTO THESE AREAS:
_______
-
THE AREA BEHIND THE APU EXHAUST DUCT: 25m (82ft.) REARWARD OF THE
DUCT, MORE THAN 3m (10ft.) ABOVE THE GROUND, AND THE WIDTH OF THE
HORIZONTAL STABILIZER
-
THE AREA AROUND THE APU AIR-INTAKE: 2m (7ft) AROUND THE INTAKE
-
THE AREA OF THE OIL-COOLER OUTLET.
THERE IS A RISK OF INJURY IF YOU GO INTO THESE AREAS.
CAUTION : DO NOT USE THE APU DURING FLUID DE-ICING OPERATIONS. DE-ICING FLUID
_______ CAN CONTAMINATE THE INSIDE OF THE APU.
CAUTION : DO NOT TRY TO START THE APU A FOURTH TIME UNTIL THE STARTER MOTOR IS
_______ COOL (60 MINUTES MINIMUM). WE RECOMMEND THAT YOU TRY TO START THE APU THREE TIMES, WITH AN INTERVAL OF ONE MINUTE BETWEEN EACH TIME THAT YOU TRY.
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