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CL-65 Study Guide > Auxiliary Power Unit > Flashcards

Auxiliary Power Unit Flashcards

1
Q

Max permissable load on the APU generator?

A

40 KVA

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2
Q

Max altitude for starting?

A

37,000 ft

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3
Q

Max altitude for APU operation?

A

41,000 ft

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4
Q

Max altitude for APU bleed air extraction?

A

25,000 ft

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5
Q

Max Speed with APU door open?

A

220 KIAS if APU not operating (No speed limitation if APU is operating)

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6
Q

What battery 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 (Electronic Control Unit)

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8
Q

What does the APU battery power during an APU start?

A

Cranking of the 28 VDC start motor

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9
Q

When will the AVAIL switch/light illuminate?

A

99% RPM plus 2 seconds

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10
Q

The APU supplies pneumatic power for…

A

Main engine starts and Air Conditioning

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11
Q

The APU ECU controls the APU during

A

All Phases of operation

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12
Q

The APU control system ensures priority is given to:

A

Electric loads

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13
Q

Pressurized fuel is supplied to the APU by the

A

Left Boost pump

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14
Q

What is the purpose of the internal bypass valve?

A

Allows the APU to continue to run if APU pump fails

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15
Q

APU RPM is displayed on the…

A

EICAS Status page

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16
Q

APU Bleed air is controlled by a modulating

A

APU LCV (Load Control Valve)

17
Q

APU bleed pressure readout can be monitored on

A

EICAS “ECS” synoptic page (Environmental Control System)

18
Q

APU intake door is located

A

Upper right hand side of the aircraft

19
Q

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

A

APU POWER/FUEL switch light is pressed in

20
Q

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

A

106%

21
Q

Where is the APU located?

A

Tail Cone

22
Q

APU secondary function(s)

A

Supplies bleed air for air conditioning and supplies air for engine starting

23
Q

The APU door position is displayed on the..

A

EICAS status page

CL-65 Study Guide (25 decks)

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