Subtask 49-00-00-860-078
C. Aircraft Maintenance Configuration.
(1)
On the overhead panel 25VU, push the APU MASTER SW pushbutton switch (the ON legend comes on).
(2)
Do the procedure to get the SYSTEM REPORT/TEST item APU (Ref. TASK 31-32-00-860-001).
4. Procedure
_________ Subtask 49-00-00-740-050
A. Self-Test of the ECB (59KD)
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the MCDU: On the MCDU:
-push the pushbutton switch - the APU page is shown.
adjacent to the APU indication.
2. On the MCDU: On the APU SYSTEM SELF-TEST page:
-push the pushbutton switch - the TEST OK is shown if the ECB
adjacent to the SYSTEM (59KD) is serviceable.
SELF-TEST indication.
5. Close-up
________ Subtask 49-00-00-860-079
A. Aircraft Maintenance Configuration.
(1)
On the MCDU, push the line key adjacent to the RETURN indication until the CFDS menu page comes into view.
(2)
On the overhead panel 25VU, release the APU MASTER SW pushbutton switch (the ON legend goes off).
(3)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
TASK 49-00-00-870-001
Purging of the APU Fuel System
WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______ WHEN YOU DO THE MAINTENANCE TASK(S).
1. Reason for the Job
__________________
Maintenance procedure that is necessary for the removal of air or oil from the APU fuel system.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific blanking caps
No specific circuit breaker(s) safety clip(s)
No specific container 10 l (2.6416 USgal)
No specific access platform 2.5 m (8 ft. 2 in.)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
from the External Power 28-00-00-910-001 Fuel Safety Procedures 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
Configuration before Maintenance Action 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access
3. Job Set-up
__________ Subtask 49-00-00-941-053
A. Safety Precautions
(1)
Obey the Fuel Safety Procedures (Ref. TASK 28-00-00-910-001).
(2)
On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3)
Put a warning notice in the cockpit to tell persons not to start the APU.
(4)
Make sure that ground fire extinguishing equipment is available.
(5)
Make sure that hydraulic systems are depressurized
(Ref. TASK 29-00-00-864-001).
(6)
Put the container below the Fuel Control Unit (FCU). Subtask 49-00-00-865-057
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 49-00-00-010-052
C. Get Access
(1)
Put the access platform in position below the APU access doors 315AL and 316AR.
(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.
Subtask 49-00-00-020-051
D. Disconnect the electrical connector P10 from the ignition unit.
(1)
Put blanking caps on the disconnected electrical connectors.
(2)
Put the container below the primary fuel manifold.
(3)
Disconnect the primary fuel-feed pipe at the primary fuel manifold.
(4)
Make sure that the APU intake and exhaust blanking plugs are removed. Subtask 49-00-00-865-058
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