(b)  
P83 panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT
 2) APU START

 S 865-004
 (3)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6H5, FIRE EXTINGUISHER APU
 2) 6G5, APU FUEL S/O VALVE

 (b)  
P180 DC Power Distribution Panel
 1) 180H4, FUEL BOOST PMP CONT AFT 2 & FWD 3

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747-400 MAINTENANCE MANUAL
 (c)  
P414 Main Power Distribution Panel
 1) 414R18, FUEL BOOST PUMP MAIN 2 AFT

 (d)  
P415 Main Power Distribution Panel
 1) 415M29, FUEL BOOST PUMP MAIN AFT 3

 S 865-006
 (4)  
Supply electrical power (AMM 24-22-00/201).

 S 865-384

 (5)  
Make sure the airplane is in this configuration:

 (a)  
The aft boost pump switches for the No. 2 and No. 3 main tanks, found on the P5 pilots' overhead panel, are in the off position.

 (b)  
The fuel quantity in each of the No. 2 and No. 3 main tanks is more than 2800 pounds (1270 kilograms).

 F.
APU Fuel-Feed System Operation Test

 S 865-011
 (1)  
Make sure the EICAS message, APU FUEL VALVE (STATUS), shows on the status page of the EICAS auxiliary display.

 S 865-012

 (2)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  
P6 Main Power Distribution Panel
 1) 6G5, APU FUEL S/O VALVE

 S 865-001
 (3)  
Set the APU control switch, found on the P5 pilots' overhead panel, to the ON position.

 S 865-013

 (4)  
Make sure these EICAS messages do not show on the main EICAS display or the status page of the auxiliary EICAS display:

 (a)  
APU FUEL (ADVISORY)

 (b)  
APU FUEL PUMP (STATUS)

 (c)  
APU FUEL VALVE (STATUS)

 S 285-034
 (5)  
Listen and make sure the APU DC fuel pump, found on the rear spar of the No. 2 main tank operates.

 S 215-035

 (6)  
Make sure the manual override lever on the APU fuel shutoff valve, found on the rear spar of the No. 2 main tank, is in the open position.

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747-400 MAINTENANCE MANUAL
 S 865-016
 (7)  Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P180 DC Power Distribution Panel 1) 180H4, FUEL BOOST PMP CONT AFT 2 & FWD 3 (b) P414 Main Power Distribution Panel 1) 414R18, FUEL BOOST PUMP MAIN 2 AFT (c) P415 Main Power Distribution Panel 1) 415M29, FUEL BOOST PUMP MAIN AFT 3
 S 285-373
 (8)  With the ground service bus energized, listen and make sure the No. 2 and No. 3 main aft boost pumps (found on the rear spar of the inboard main tanks) operate.
 S 285-037
 (9)  Listen and make sure the APU DC fuel pump does not operate. (a) Make sure CMCS message 28767, APU DC PUMP ON WHEN COMMANDED OFF, is not active.
 S 865-019

 (10) Release the APU fire handle, found on the P5 pilots overhead panel, with the manual push button found behind the APU fire handle.
 S 865-020
 CAUTION:_______DO NOT TURN THE APU FIRE HANDLE. IF YOU TURN THE APU FIRE HANDLE, THE APU FIRE BOTTLE COULD DISCHARGE.
 (11)
 Pull the APU fire handle to the fully extended position. S 215-038

 (12)
 Make sure the APU fuel shutoff valve is in the closed position. S 865-022

 (13)
 Put the APU fire handle to the usual locked position. S 865-023

 (14)
　
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