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APU BLEED AIR IS AVAILABLE UP TO ...
approximately 17.000 ft
APU START REQUIRES WHICH SOURCE?
Both, the APU battery and the aircraft main battery
APU STARTER LIMITATION
(APU starter duty cycle)
3 starts within 60 minutes
APU: NO AC POWER, APU SUPPLIED BY ...
a dedicated DC fuel pump
APU: AC POWER AVAILABLE, APU SUPPLIED BY ...
the left forward AC fuel pump
(regardless of its switch position)
APU: ON GROUND, BAT SWITCH OFF ...
(not recommended because while the APU will go through a cooldown cycle, APU fire detection may not be available)
In flight, BAT Switch position does not affect APU operation
Boeing 757-300 Systemknowlege Nice To Know Items