(2)
An APU shutdown occurs when the APU control switch is set to the OFF position. The APU continues to operate for approximately 60 seconds during its cool-down cycle. During the cool-down cycle, pneumatic and electrical loads are not available, the air inlet door closes and the APU fuel shutoff valve closes.
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747-400
MAINTENANCE MANUAL
B. For more details on the APU system, refer to these wiring diagrams and functional schematics: WDM 49-11-11: APU Start Control Circuit WDM 49-11-12: APU Start WDM 49-11-13: APU Fire Circuit WDM 49-11-14: APU Power and Electronic Control Unit Output WDM 49-11-15: APU Electronic Control Unit Input WDM 49-11-16: APU Interface (A) WDM 49-11-17: APU Interface (B) WDM 49-11-18: APU Interface (C) WDM 49-61-21: APU Remote Fire Warning SSM 49-11-01: APU Control SSM 49-11-03: APU Fire Shutdown SSM 49-61-01: APU Remote Fire Warning.
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747-400 FAULT ISOLATION/MAINT MANUAL
AUXILIARY POWER UNIT
COMPONENT 102 SHT FIG. QTY ACCESS/AREA AMM REFERENCE
AUXILIARY POWER UNIT, M299
1 COMPARTMENT) 317AL, 318AR/310 (APU 49-11-01
Auxiliary Power Unit - Component Index
Figure 101
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747-400 FAULT ISOLATION/MAINT MANUAL
APU COMPARTMENT
A
Auxiliary Power Unit - Component Location
Figure 102
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747-400 MAINTENANCE MANUAL
AUXILIARY POWER UNIT - MAINTENANCE PRACTICES
____________________________________________
1. General_______
A. This procedure has these tasks:
(1)
APU starting and operation
(2)
APU usual shutdown
(3)
APU emergency shutdown
(4)
APU ground mode simulation
(5)
APU wet motoring
(6)
APU dry motoring
(7)
APU system deactivation (with APU installed)
(8)
APU system activation (with APU installed)
(9)
APU system deactivation (with APU removed)
(10)
APU system activation (with APU removed)
(11)
APU preservation (less than 7 days)
(12)
APU preservation (8 days to 28 days)
(13)
APU preservation (29 days to 90 days)
(14)
APU preservation (more than 91 days)
(15)
APU depreservation (less than 7 days)
(16)
APU depreservation (8 days to 28 days)
(17)
APU depreservation (29 days to 90 days)
(18)
APU depreservation (more than 91 days).
TASK 49-11-00-862-001
2. APU Starting and Operation (Fig. 201, Fig. 202)__________________________
A. General
(1) Fuel tank No. 2 must have a minimum of 2800 pounds (1270 kilograms) of fuel to start and operate the APU for one hour. Plan for an additional 750 pounds (340 kilograms) of fuel for each additional hour of operation. Airplane systems/operations requiring more fuel in tank No. 2 are more important than the APU system requirements.
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