APU Flashcards
What is the max altitude the APU can be started
43,100 ft
What does the APU supply to the Aircraft
Just Electrical power
450 Kw
How is the power supplied?
2 Starter Generators
Left and Right
Where can you get DU info about the APU
SYS STAT
Where is the Fuel supply for APU
AC Power AFT pump
fuel system can be configured to allow any pump to feed the APU
When the APU is operating what happens to the switch lites
the Press lite in the L AFT pump goes out
Can APU be operated with out AC power to supply the pumps
Yes,
automatically supplied by a DC pump in left tank
How High will the APU start without any fuel pumps
14,000 ft
What happens when APU is in the ON position
opes the APU fuel spar valve
opens the Air Inlet Door
fuel pump
powers APU controller
What does the APU fault lite mean
APU Fire
Fault
Shutdown due to fault or fire
What does the APU wait for before starting
CCS Common Core System
because the CCS provides fire detection and fuel management
How do you know when you can start the APU
wait for the CDU to be displayed on the lower DU
describe the APU start sequence
once at proper speed the APU controller commands the ignition and fuel
Stater cut out at 50%
at 95% +2 sec EICAS - APU RUNNING
What is the power supply for hierarchy
ENG
APU
EXT AC
What are the starter limitations for APU
after 2 consecutive attempts
5 min cooling period before a third attempt is made
