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 can prevent an APU to start?
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Definition
a) APU fire
b) APU fire detection 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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Term
Can you start the APU after a
dual generator failure? |
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Definition
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