APU Flashcards

0
Q

The APU supplies pneumatic power for:

A

Main engine Starts and Air Conditioning

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1
Q

The APU is equipped with a:

A

40 KVA generator

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2
Q

The APU ECU controls the APU during:

A

All phases of operation

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3
Q

The APU control system ensures priority is given to:

A

Electric loads

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4
Q

Pressurized fuel is supplied to the APU by the:

A

APU fuel pump

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5
Q

APU RPM is displayed on the

A

EICAS status page

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6
Q

APU “AVAIL” will illuminate at

A

99% RPM and two seconds later

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7
Q

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

A

APU POWER/FUEL switch/light is pressed in

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8
Q

“APU overspeed “ warning message is displayed when RPM exceeds

A

106%

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9
Q

Where is the APU located?

A

Tail cone

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10
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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11
Q

APU rpm is displayed on the

A

EICAS status page

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12
Q

APU Bleed air is controlled by modulating

A

APU LVC

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13
Q

APU bleed pressure read out can be monitored on

A

EICAS “ECS” Synoptics page

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14
Q

APU intake door is located

A

Upper right hand side of aircraft

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15
Q

APU secondary function(s)

A

Supplies bleed air for air conditioning

Supplies air for main and engine starting

16
Q

If APU door is open or unknown position airspeed is restricted to

17
Q

What is the max operating altitude for the APU?

A

41,000 feet

18
Q

APU intake door is located:

A

Upper right-hand side of aircraft

19
Q

An APU fire will be extinguished automatically when:

A

On the ground.

20
Q

Max altitude for starting the APU.

A

37,000 feet.

21
Q

What tank does the APU fuel pump draw from?

A

The left collector tank.

22
Q

What batteries are required to start the APU in flight?

A

The APU battery and the main battery, both need a minimum of 22 volts.

23
Q

How long does the APU need to warm up before RTL (ready to load for pneumatic loading).

A

60 seconds (99% RPM + 60 seconds)

24
What happens if you push the " APU fire push" switch light???
1) arms squib 2) closes fuel SOV 3) closes LCV (load control valve) ( which is pressurized air control) 4) trips APU Generator (off)
25
The APU door position is displayed on the
EICAS status page
26
What is the LCV ?
Load Control Valve: Modulates to Control bleed air for air conditioning. ACSC
27
What happens if you push the PWR fuel switch light ?
It initiates the APU pre-start sequence.
28
Explain what your looking for on the APU pre-start check ?
``` Push the PWR FUEL switch light. ECU and Fuel pump activate. SOV opens. EICAS displays will show: APU IN BITE (for 5 seconds) DOOR OPEN (APU door open) RPM and EGT pop up on ED2 ```
29
Where are the two APU remote cut-off switches located?
One is on the external services panel, the other is inside the APU compartment.