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13 Cards in this Set

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  • Back
What type of power does the APU generator supply?
It acts as an auxilliary AC power source
What power source is used to start the APU?
Battery power is used to start the APU if no AC power is available (engines/external power unit)
What does automatic shutdown protection provide?
It automatically shuts the APU down when:
- oil pressure is low
- there is a system fault
- an overspeed is detected
- an overtempetaure or fire is detected
- high oil temperature
Which tank is fuel supplied to the APU from?
Main tank No. 1
What are the APU altitude limits:
Electrical + Bleed
Bleed only
Electrical
APU Bleed and Electrical - 10000'
APU Bleed only - 17000'
Electrical load - 41000'
APU bleed valve must be closed when.........
- Ground air is connected and isolation vlave is open
- Engine No 1 bleed valve open
- Isolation & Engine bleed No 2 valves open
Can the APU be started or shutdown during refuelling?
NO!
What happens to the APU if the battery switch is positioned to OFF?
The APU, on the ground, will automatically shutdown. The battery switch must be ON for APU operations.
When you switch the APU off does it switch straight off? If not, how long does it remain on?
The APU switches off if APU bleed valve has not been opened.
If the bleed valve has been opened, it will cool down for 90 seconds before shutting down.
APU EGT Limits.
No limits on NG; system self monitors exceedance.
Why is 1 fuel pump run whlst on the ground with the APU running?
Extended life of the APU FCU can be achieved by operating at least 1 fuel pump to supply fuel under pressure to the APU.
APU FAULT light indicates?
FAULT LIGHT indicates:
- a malfunction exisits and the APU is automatically shutting down
- remains illuminated if fuel valve has failed or OVERSPEED protection is lost
Can the APU run multiple generators?
Yes the APU can run multiple generators both in flight and on the ground.