APU Flashcards
Apu Mastery
Apu supplies power for ?
Normal Grd Ops
+
Starting Eng
Auxilary Pwr source for Inflight
Apu operate in which 2 modes?
Attended & Unattended mode
Apu Attended mode means?
Either eng Start or running in flight
Apu unattended mode means?
On ground ops
Apu use how many ASG’s (Apu Starter Generator) to start + supply Electric Pwr?
2
Min of 1 is required
Apu can be started and operated up to which Alt?
43,100 ft
Power output of APU Generator Degrades as Altitude increase due to:
Turbine Performance
Apu Generator output is only
1/4 of sea level output
Fuel for APU is supplied from Left main tank if:
Airplane pwr is not available
or
Airplane fuel pump with AC pwr not available
If Apu is auto started due to power loss and power is restored, How should you turn off the APU?
APU on then off
The Apu can be started by which available power?
Ext Pwr
Main Generators
Apu Battery
To start Apu, it uses 1 of 2 ASG when?
A/C pwr is Available
To start APU on the battery must be on. T or F?
True
Apu Battery + Main Batter supplies power to start APU when?
No AC pwr available
When APU Selector is set to off what will happen
Apu Cooling Dn Eicas for 2 mins
Apu Stops
When Apu Stops what happens?
Apu Cooling Dn Eicas -Remove
Fuel Valve close
Fuel Pump stop
Apu Limit Message means?
Apu more than normal limit
or
Apu autoshut down
Apu fault message mean?
Apu Shutdown
Do Apu Auto shutdown have Cool down period?
No
When Apu limit message is shown, it will continue to operate so you must?
Manually turn it off
&
It will have no cool down period
Apu autostart occurs regardless of Apu selector position when?
Loss 3 or more Engine Generators
