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13 Cards in this Set
- Front
- Back
What type of power does the APU generator supply?
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It acts as an auxilliary AC power source
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What power source is used to start the APU?
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Battery power is used to start the APU if no AC power is available (engines/external power unit)
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What does automatic shutdown protection provide?
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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 |
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Which tank is fuel supplied to the APU from?
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Main tank No. 1
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What are the APU altitude limits:
Electrical + Bleed Bleed only Electrical |
APU Bleed and Electrical - 10000'
APU Bleed only - 17000' Electrical load - 41000' |
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APU bleed valve must be closed when.........
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- Ground air is connected and isolation vlave is open
- Engine No 1 bleed valve open - Isolation & Engine bleed No 2 valves open |
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Can the APU be started or shutdown during refuelling?
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NO!
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What happens to the APU if the battery switch is positioned to OFF?
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The APU, on the ground, will automatically shutdown. The battery switch must be ON for APU operations.
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When you switch the APU off does it switch straight off? If not, how long does it remain on?
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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. |
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APU EGT Limits.
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No limits on NG; system self monitors exceedance.
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Why is 1 fuel pump run whlst on the ground with the APU running?
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Extended life of the APU FCU can be achieved by operating at least 1 fuel pump to supply fuel under pressure to the APU.
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APU FAULT light indicates?
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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 |
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Can the APU run multiple generators?
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Yes the APU can run multiple generators both in flight and on the ground.
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