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Title: APU

Description: Cessna Sovereign

Total Flash Cards: 28

Created: 03/22/2009 22:16:22

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Additional Aviation Flashcards

Cards in this set:

Term

 

 

 

 

 

Max altitude to start APU

Definition

 

 

 

 

 

FL 200

Term

 

 

 

 

 

Max altitude to operate APU

Definition

 

 

 

 

 

FL 300

Term

 

 

 

 

From what wing is the APU

fuel supplied from?

Definition

 

 

 

 

 

 Right wing

Term

 

 

 

 

Approximate fuel burn

of APU

Definition

 

 

 

 

110 PPH unloaded

 

125 PPH loaded

Term

 

 

 

 

 

Max EGT

Definition

 

 

 

 

 

690 C

Term

 

 

 

What happens when

pressing MAX COOL?

Definition

 

 

 

 

 

Bleed control valve opens fully

after 20 seconds

Term

 

 

 

From what bus is the

APU powered?

Definition

 

 

 

 

 

Left emer bus

Term

 

 

 

 

What happens to the APU

with loss of DC power?

Definition

 

 

 

 

 

APU shuts down

Term

 

 

 

 

Why should max cool

not used in manual mode?

Definition

 

 

 

 

The temperature control valves (TCV)

could be fully open

 

Will cause overtemp under floor ducts

Term

 

 

 

When can you retart the

APU after shut down?

Definition

 

 

 

 

30 seconds after displaying 0%

Term

 

 

 

What lights illuminate

during the APU test?

Definition

 

 

 

 

 

All lights but reset

Term

 

 

 

 

What does "APU system

fail" mean?

Definition

 

 

 

ECU detects a fault prior to start

 

 

Or ECU initiate shutdown due

to exceedance or loss of sensors

Term

 

 

 

 

What is required to get the

audio test portion of the APU?

Definition

 

 

 

a) Avionics on

 

b) Or APU master on for more than 1 minute

Term

 

 

 

When are transient

amps allowed?

Definition

 

 

 

 

 

Engine start + 2 minutes

Term

 

 

 

 

What must you check during

APU start around 50% RPM?

Definition

 

 

 

 

GCU opens start relay

(APU relay engaged light extinguishes)

Term

 

 

 

 

When does the APU relay

engaged illuminates?

Definition

 

 

 

a) Anytime APU generator is providing

power to the left emer bus

 

b) During APU start

Term

 

 

 

Why can't we just press "stop"

when the APU relay

is stuck closed?

Definition

 

 

 

 

 

Once the generator becomes a starter again,

it will keep motoring

Term

 

 

 

 

What prevents an APU to start?

Definition

 

 

a) APU fire

 

b) APU fire dectection fail

 

c) Fire bottle baggage/APU low message

Term

 

 

 

 

Why can't max cool

give hot air?

Definition

 

 

 

 

 

Because APU shuts off valves (BCV)

to avoid EGT limit

Term

 

 

 

 

When should you check

the APU oil?

Definition

 

 

 

 

 

5 minutes after shutdown

Term

 

 

 

Why should you turn off

APU bleed air prior to

engine start?

Definition

 

 

 

 

 

Prevents APU exhaust to enter the cabin

Term

 

 

 

 

What CAS messages

will shutdown the APU?

Definition

 

a) APU fire

 

B) APU fire detect fail

 

c) Fire bottle low bag-apu

 

d) ACM bleed leak

 

Term

 

 

 

 

When does the "ready to load"

light comes on?

Definition

 

 

 

 

 

95% + 4 seconds

Term

 

 

 

 

What valve does the APU master switch open or close?

Definition

 

 

 

 

 

APU firewall shut off valve

Term

 

 

 

How long can you fly with

the APU amber light illuminated

in tailcone compartment?

Definition

 

 

 

 

 

20 hrs

Term

 

 

 

How do you know if

the relay engaged light

did extinguish at 50%?

Definition

 

 

 

 

 

Turn off the generator. The relay should open, extinguishing the light

Term

 

 

 

 

 

Max speed to start the APU?

Definition

 

 

 

 

 

 

250 kts

Term

 

 

 

How can you start the APU in flight

without the passengers hearing

the "APU FIRE" voice?

Definition

 

 

 

 

 

Press the mute button



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