Term
Max altitude to start APU
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Definition
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Term
Max altitude to operate APU
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Definition
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Term
From what wing is the APU fuel supplied from?
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Definition
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Term
Approximate fuel burn of APU
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Definition
110 PPH unloaded 125 PPH loaded |
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Term
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Definition
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Term
What happens when pressing MAX COOL?
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Definition
Bleed control valve opens fully after 20 seconds |
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Term
From what bus is the APU powered?
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Definition
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Term
What happens to the APU with loss of DC power?
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Definition
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Term
Why should max cool not used in manual mode?
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Definition
The temperature control valves (TCV) could be fully open Will cause overtemp under floor ducts |
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Term
When can you retart the APU after shut down?
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Definition
30 seconds after displaying 0% |
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Term
What lights illuminate
during the APU test?
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Definition
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Term
What does "APU system fail" mean?
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Definition
ECU detects a fault prior to start Or ECU initiate shutdown due to exceedance or loss of sensors |
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Term
What is required to get the audio test portion of the APU?
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Definition
a) Avionics on b) Or APU master on for more than 1 minute |
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Term
When are transient amps allowed? |
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Definition
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Term
What must you check during APU start around 50% RPM?
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Definition
GCU opens start relay (APU relay engaged light extinguishes) |
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Term
When does the APU relay engaged illuminates?
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Definition
a) Anytime APU generator is providing power to the left emer bus b) During APU start |
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Term
Why can't we just press "stop" when the APU relay is stuck closed?
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Definition
Once the generator becomes a starter again, it will keep motoring |
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Term
What prevents an APU to start?
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Definition
a) APU fire b) APU fire dectection fail c) Fire bottle baggage/APU low message |
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Term
Why can't max cool give hot air?
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Definition
Because APU shuts off valves (BCV) to avoid EGT limit |
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Term
When should you check the APU oil?
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Definition
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Term
Why should you turn off APU bleed air prior to engine start?
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Definition
Prevents APU exhaust to enter the cabin |
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Term
What CAS messages will shutdown the APU?
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Definition
a) APU fire B) APU fire detect fail c) Fire bottle low bag-apu d) ACM bleed leak |
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Term
When does the "ready to load" light comes on?
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Definition
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Term
What valve does the APU master switch open or close?
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Definition
APU firewall shut off valve |
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Term
How long can you fly with the APU amber light illuminated in tailcone compartment?
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Definition
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Term
How do you know if the relay engaged light did extinguish at 50%?
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Definition
Turn off the generator. The relay should open, extinguishing the light |
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Term
Max speed to start the APU?
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Definition
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Term
How can you start the APU in flight
without the passengers hearing
the "APU FIRE" voice? |
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Definition
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Term
With the bleed air ON, what happens
when you select MAX COOL to ON? |
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Definition
It opens the bleed air control
valve to max open position |
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Term
What is the minimum battery
voltage to start the APU? |
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Definition
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Term
Why must you close the bus tie
to start the APU in flight? |
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Definition
To allow both batteries to participate |
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