When the Apu master switch is released, a normal Apu shutdown occurs
Without delay in all cases
With a delay in all cases
With a delay if the bleed air was in use
Only after the main batteries are switched off
What are the apu manual shut down possibilities in the cockpit
Apu master switch push button, Apu fire push button switch
Apu master switch push button
Apu fire push button switch, Apu shut off push button.
Apu avail push button switch.
Normal electrical system being available, you may restart the apu up to
31,000 ft
21,000 ft
41,000 ft
45,00 ft
When the Apu is running, the Apu fuel pump
Runs when the tank pump pressure is not sufficient
Runs all the time
Runs only in flight
Runs when the Apu fuel pump is selected on
Normal Apu rotation speed (N%) is
99% ( Ground, nil bleed demand, OAT > 18c <35c)
Always steady at 99 %
Always 80 %
Always 75 %
Apu master switch selected on
On illuminates blue, Apu system is supplied and Apu starts at 95%, Avail comes on
On illuminates blue, Apu system is supplied, Apu starts as soon as start P/b is depressed and intake flap opens
Apu fuel pump runs immediately
On illuminates green and Apu starts
Apu bleed air is controlled
By ECB ( N% adjustment)
Not controlled
By Apu bleed valve, which operates as a shut off valve
By pack flow switch Lo/Norm/Hi on overhead panel
Apu N indication becomes amber on ECAM SD, when
N >/= 107 %.
N >/= 102 %
N >/= 99 %
N >/= 95 %
Apu EGT indication becomes red on ECAM SD, when
EGT >/= 715 c ( Apu running)
EGT >/=1038 c ( Apu running)
EGT >/= 675 c (Apu running) or EGT . 1090 c (during apu start)
EGT .> 950 c
On ground, Apu provides
Electrical power & hydraulic power
Electrical power & bleed air
Hydraulic power & bleed air
Hydraulic power & electrical power
Air Bleed extraction for wing anti-ice
Is permitted
Is not permitted
Is permitted only on ground
Is permitted only in flight
Can you start the Apu using the a/c batteries
Yes
No
Only on the ground
Only in flight
The Apu is supplied from the
Left fuel feed line
Right fuel feed line
Centre tank always
Right inner tank always
If air bleed was used, after a manual shut down sequence the apu
Stops immediately
Keeps running for four minutes
Keeps running for between 60 sec
Keeps running for 10 mins
Avail light illuminates on start p/b when
External power is disconnected
2 seconds after Apu N reaches 95 %
Apu electric power is used
Main engine generator is on line
The Apu has its own lubrication system
No, it is lubricated and cooled by hydraulic fluid from the green system
No, it uses the same oil as engine no. 2
What determines the Apu speed in accordance with air bleed demand
Electronic control box
Air conditioning system
Air intake system
Main engine rpm
Besides the master switch on the cockpit Apu panel, Apu shutdown is possible by
Switching off the left fuel pumps
Switching off the right fuel pumps
Turning off both main batteries
Pressing the Apu Shut Off push button on the external interphone panel or pushing the APU fire pushbutton (o/head fire p/b)
The supply of electrical power has priority over bleed air supply;
Only above 25000 feet
Only when the ditching pushbutton has been selected on
Master switch on, the ;
Apu starts
ECB is electrically supplied
Air intake flap closes
Apu fuel pump starts immediately
