B. References
(1)
AMM 12-13-02/301, Auxiliary Power Unit
(2)
AMM 12-13-05/301, APU Starter Motor
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 26-22-00/501, APU Fire Extinguishing System
(5)
AMM 31-61-00/201, Integrated Display System
C.
Access
(1)
Location Zones
221 Control Cabin - Left
222 Control Cabin - Right
310 Fuselage - Station 2360 to Station 2792
(2)
Access Panels
317AL APU Access Door - Left
318AR APU Access Door - Right
D.
Procedure
S 612-135
(1)
Make sure the oil level in the clutch housing for the APU starter motor is full. To service it, do this task: APU Starter Motor Oil Replenishing (AMM 12-13-05/301).
S 612-136
(2)
Make sure the oil level in the APU oil tank is full. To service it, do this task: APU Oil Tank Replenishing (AMM 12-13-02/301).
S 212-286
(3)
Make sure there are no loose objects near the air inlet door.
NOTE: Loose objects can go into the air inlet duct and compressor
____ inlet plenum of the APU during the APU operation.
S 862-003
(4)
Make sure that these circuit breakers are closed:
(a)
P180-1 DC Power Standby Panel
1) 180K7, APU BAT BUS/MN BAT
2) 180K9, MN BAT CHGR OUTPUT
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
3) 180H19, FUEL BOOST PUMP CONT FWD 2 & AFT 3
(b)
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU DUCT OVERHEAT 2) APU INLET DOOR 3) APU PRIME CONT 4) APU START
(c)
P6 Main Power Distribution Panel
1) 6C6, FIRE SWITCH UNLOCK
2) 6H5, FIRE EXTINGUISHER APU
3) 6H14, APU FIRE/BLD DUCT OVHT LOOP A
4) 6H15, APU FIRE/BLD DUCT OVHT LOOP B
5) 6H16, APU FIRE WARN HORN
6) 6H18, APU DC FUEL PUMP
7) 6K18, APU ALTN CONT
(d)
P415 Right Power Distribution Center Panel
1) 415M29, MAIN AFT 3 FUEL BST PUMP
S 862-004
(5)
Set the APU START SOURCE switch on the P461 overhead maintenance panel:
(a)
Set the APU START SOURCE switch to the TR position for an external power start.
(b)
Set the APU START SOURCE switch to the APU BATTERY position for a main battery start.
S 862-145
(6)
Set the BATTERY switch on the P5 overhead panel to the ON position.
S 862-137
(7)
Set the STANDBY POWER switch to the AUTO position.
S 862-005
(8)
Set the APU air supply valve on the P5 overhead panel to the OFF position.
S 742-307
(9)
Get access to the APU maintenance page. To get access to it, do this task: Obtain Airplane System Information (AMM 31-61-00/201).
(a)
Make sure these EICAS messages do not show on the APU
maintenance page:
1) FIRE/OVERHT (STATUS)
2) DET FIRE APU (ADVISORY)
3) FIRE APU (WARNING)
(b)
Make sure the APU oil LO indication does not show on the EICAS display.
NOTE: A minimum quantity of oil is necessary to start the
____ APU. If there is not a sufficient quantity of oil, the APU controller will automatically stop the start sequence.
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