(2)
Pressurize the reservoirs of the hydraulic systems.
(Ref. TASK 29-14-00-614-002).
(3)
De-energize the ground service network
(Ref. TASK 24-42-00-862-001).
(4)
Make sure that the work area is clean and clear of tool(s) and other items.
(5)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
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CES TASK 49-00-00-790-003
Leak Test of the APU (131-9(A))
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001 Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network 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 49-00-00-710-010 Operational Test of the APU (131-9(A)) 49-00-00-860-009 APU Shutdown by External Power (131-9(A)) 49-16-00-100-003 Cleaning of the APU Air Intake System (131-9(A)) 49-20-00-100-004 APU Compressor Cleaning (131-9 (A)) 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access
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CES 3. Job Set-up
__________ Subtask 49-00-00-860-098
A. Aircraft Maintenance Configuration
(1)
Energize the ground service network
(Ref. TASK 24-42-00-861-001).
(2)
On the panel 25VU, make sure that the APU MASTER SW p/bsw is OFF.
(3)
Make sure that hydraulic systems are depressurized
(Ref. TASK 29-00-00-864-001).
4. Procedure
_________ Subtask 49-00-00-790-052
A. Test the APU for Oil/Fuel Leaks
(1)
Start and operate the APU in the ECS mode (Ref. TASK 49-00-00-710-010).
(2)
During APU operation:
-
check for oil smell in the passenger compartment.
-
check for smoke from the APU exhaust.
NOTE : Oil smell in the passenger compartment is an indication of
____ internal oil leakage or ingestion of external oil leakage. Smoke from the APU exhaust is an indication of internal oil leakage.
(3)
Stop the APU (Ref. TASK 49-00-00-860-009).
(4)
Put a warning notice in the cockpit to tell persons not to start the APU.
Subtask 49-00-00-865-105
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
R EFF : 001-049, 101-105, 107-107, 151-199, 49-00-00Page 518 201-210, Config-2 Aug 01/05
CES Subtask 49-00-00-010-066
C. Get Access WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT
_______
BURNS WHEN YOU DO THE MAINTENANCE TASK(S).
(1)
Put the access platform in position below the APU access doors 315AL and 316AR.
(2)
Open the APU access doors 315AL and 316AR (Ref. TASK 52-41-00-010-001).
(3)
Set the LIGHT control SW 11LJ to the ON position. Subtask 49-00-00-210-066
D.
Visually Inspect the APU for Oil/Fuel Leaks.
(1)
Inspect the APU and plumbing for oil/fuel leaks. If leak(s) are apparent:
(a)
Locate and repair all oil/fuel leaks.
(b)
Clean the APU externally (Ref. TASK 49-20-00-100-004).
(c)
Clean the APU compartment.
(d)
Clean the APU access doors internally and externally.
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