3. Job Set-up
__________ Subtask 28-22-00-860-052
 A. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 (2)
 On the APU section of the overhead panel 25VU, make sure that the APU MASTER SW is in the off position (the ON legend is off).

 (3)
 On the FUEL overhead panel 40VU, make sure that all L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).

 Subtask 28-22-00-865-050
 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU APU/FUEL/BLOW OFF/PUMP 2QC B14 121VU APU/FUEL/BLOW OFF/CTL 1QC K39 121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41 121VU APU/FUEL/LP VALVE/CTL 1QF M40 121VU APU/FUEL/LP VALVE/SPLY 2QF M39 121VU APU/FUEL/PUMP/CTL 3QC M38
 Subtask 28-22-00-010-050
 C. Get Access WARNING : LOCK THE MECHANISM OF THE ACCESS DOOR 316AR WITH THE PIP PIN
_______ WHEN YOU OPEN THE ACCESS DOOR. THIS WILL PREVENT INJURY.
 (1)
 Put the access platform in position below the APU compartment.

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

 (3)
 Remove the blanking plug from the APU fuel vent and drain valve and install the ADAPTER - VENT AND DRAIN VALVE, APU.

 (4)
 Put a container below the APU fuel vent and drain valve to collect the fuel.

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 (5) Make sure that the outlet from the drain mast at FR47 has no
 blockage.
 _________

4. Procedure
 Subtask 28-22-00-710-050
 A. Do this test.
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the front firewall FR80 in the APU compartment:
 -push and hold the pushbutton switch VENT APU FUEL LINE 8QC.
2. On the front firewall FR80 in the APU compartment:
 -release the pushbutton switch VENT APU FUEL LINE 8QC.
5. Close-up
________
 Subtask 28-22-00-860-053At the APU fuel vent and drain valve:
-a continues flow of fuel shows thatthe APU fuel pump 4QC operates.
At the APU fuel vent and drain valve:
-the flow of fuel stops when the APUfuel pump 4QC does not operate.
 A. Put the aircraft back to its initial configuration.
 (1) De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002).

 (2) Put the system back to the serviceable condition. Subtask 28-22-00-410-050
 B. Close Access
 (1)
 Remove the ADAPTER - VENT AND DRAIN VALVE, APU and replace the blanking plug and tighten.

 (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).

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 TASK 28-22-00-710-002 Operational Test of the APU Fuel-Pump System
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific stepladder 2.0 m (6 ft. 7 in.)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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 31-60-00-860-001 EIS Start Procedure 32-12-00-010-001 Open the Main Gear Doors for Access 32-12-00-410-001 Close the Main Gear Doors after Access
 3. Job Set-up
__________ Subtask 28-22-00-860-054
 A. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 (2)
　
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