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CL-65(900) Study Guide Mesa > APU > Flashcards

APU Flashcards

0
Q

Pressurized fuel is supplied to the APU by the:

A

APU fuel pump.

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1
Q

The APU ECU Controls the APU during:

A

All phases of operation.

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2
Q

Max Altitude for starting?

A

37,000 ft

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3
Q

Max Altitude for APU bleed air extraction?

A

25,000ft

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4
Q

The battery master is ON and the PWR FUEL switchlight is pressed, what then occurs?

A
  • The ECU is powered
  • APU IN BITE
  • APU Fuel pump activates
  • APU RPM and EGT gauges appear
  • Fuel SOV opens
  • APU air inlet door opens
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5
Q

Max speed with APU door open?

A

220 kias if APU not running, otherwise no restriction

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6
Q

What batter voltage is required before starting the APU?

A

22 volts on both batteries

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7
Q

What does the main battery power during an APU start?

A

APU ECU

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8
Q

What does the APU battery power during an APU start?

A

The 28 vDC electric start motor

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9
Q

When will the AVAIL switchlight illuminate?

A

99% rpm + 2 seconds

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10
Q

What is the purpose of the internal bypass valve?

A

Allows APU to continue to run if APU pump fails

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11
Q

APU Bleed Air is controlled by modulating

A

APU LCV (Load Control Valve)

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12
Q

APU bleed pressure readout can be monitored on?

A

EICAS “ECS” synoptic page

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13
Q

The APU gauges(RPM and EGT) appear on EICAS when:

A

APU POWER / FUEL switch light is pressed in

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14
Q

“APU OVERSPEED” warning message is displayed when RPM exceeds:

A

106%

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15
Q

When does APU ignition turn off during a start?

A

95% rpm

16
Q

When does the APU starter motor disengage?

A

46% rpm when on ground

60% RPM when in flight

17
Q

Can the APU be used for Anti Ice Bleed Air?

A

No

18
Q

Can APU bleed air and another source of bleed air be used at the same time?

A

No

19
Q

What valve opens when the APU is providing electrical power above 17,000 ft?

A

The Surge Control Valve (SCV). The opening of this valve helps to reduce the chance of APU surges when operating in an unloaded bleed air condition.

20
Q

How many squibs does the APU fire bottle have?

A

1

21
Q

When will the APU ECU inhibit a start due to APU RPM?

A

The APU ECU will inhibit a start while on the ground if the RPM exceeds 5% or in flight if the RPM exceeds 12%

22
Q

Max permissible load on the APU generator?

A

40 KVA

23
Q

Max Altitude for APU operation?

A

41,000ft

24
Q

Max Altitude for APU Engine Start:

A

21,000ft due to ATS limitation

25
Q

The APU supplies pneumatic power for:

A

Main Engine Starts and Air Con

26
Q

The APU control system ensures priority is given to:

A

Electrical loads

27
Q

The APU is located

A

in the Tailcone

28
Q

APU intake door is located:

A

upper right hand side of aircraft

29
Q

APU secondary function:

A

supplies bleed air for air conditioning, supplies air for main and engine starting

30
Q

The APU door position is displayed on the:

A

EICAS status page

31
Q

APU rpm is displayed on the:

A

EICAS status page

32
Q

Where does the APU gets its fuel.

A

Left collector tank.

CL-65(900) Study Guide Mesa (3 decks)

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