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Gulfstream G550 > APU > Flashcards

APU Flashcards

1
Q

What would happen if APU air is selected on immediately after APU start?

A

The APU air would come on 60 seconds later

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2
Q

Will the APU start if the READY light is not on?

A

Yes

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3
Q

To what altitude will the APU operate?

A

45,000 feet

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4
Q

Normal APU shutdown is accomplished by pushing what switch?

A

APU stop switch

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5
Q

Selecting what APU switch to the OFF position will close the APU fuel shutoff valve immediately?

A

APU Master

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6
Q

Prior to starting the APU, how can the position of the right engine lower cowl door be checked?

A

Visually or using the “DOORS” 2/3 synoptic display

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7
Q

What is the minimum fuel temperature required prior to APU start?

A

Above -30 C

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8
Q

If necessary, how can the batteries be warmed most effectively prior to APU start?

A

Use an external AC power cart to charge and warm the batteries

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9
Q

What is the minimum acceptable battery voltage prior to APU start?

A

22 VDC

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10
Q

When is the APU air load control valve automatically inhibited OFF?

A

During APU start, and 60 seconds after start

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11
Q

How is it determined that all parameters are acceptable for APU start?

A

The APU READY light will be on

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12
Q

Will the APU start be inhibited with the absence of the READY light?

A

No, but the APU air inlet door must be verified to be open prior to start

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13
Q

After APU start, when will the APU generator automatically power the electrical buses?

A

After achieving 99% RPM for 2 seconds

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14
Q

How is an APU start manually aborted?

A

Depress the APU STOP switch, which triggers the 106% overspeed circuit, resulting in an immediate start abort

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15
Q

How is the APU normally shut down?

A

Using the APU STOP switch on the APU panel

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16
Q

How long are the APU RPM and EGT indications displayed after shutting down the APU?

A

5 minutes after APU RPM is less than 5%, and the APU MASTER is selected OFF, provided the APU ECU has a source of power

17
Q

What are the limitations for starting the APU with external DC power?

A

3 start attempts, 15 minutes in between each attempt

18
Q

Would an APU FIRE message cause the APU to shutdown in flight or on the ground?

A

Both

19
Q

Describe a normal APU shutdown

A

Once STOP is pressed, APU RPM decreases by 0.5% per second, then at 70% RPM the APU shuts down

20
Q

At approximately what point will the APU ECU close the inlet door when the STOP switch is used to shut down the APU?

A

35% RPM

21
Q

At what point with the APU ECU close the inlet door when the MASTER switch is used to shut down the APU?

A

It will motor closed based on APU RPM

22
Q

Why is there a requirement to turn off the right battery for an in flight APU start with one or both main generators powered?

A

Both batteries combined with their chargers produce too much amperage and may ramp the APU starter past the APU start envelope

23
Q

Is the APU ECU still powered after the APU MASTER switch is deselcted?

A

Yes, for 5 minutes

24
Q

What is the voltage rating for the APU generator, and is it interchangeable with the main generators?

A

40 kVA, not interchangeable

25
Q

Can the APU provide pressurization in flight?

A

G550 - Yes

26
Q

If an APU start attempt on battery power fails, how long a wait is required in order to try a second attempt?

A

No waiting is required until it fails a 3rd attempt, then 1 hour

27
Q

If an APU start attempt on external DC power fails, how long a wait is required in order to try a 2nd attempt?

A

15 minutes

28
Q

What is the maximum altitude for a guaranteed APU start?

A

43,000 ft

29
Q

With the APU running in flight, what is the maximum altitude?

A

45,000 ft

30
Q

If the APU was started on the ground, what mode will it be in flight?

A

Essential mode

31
Q

The APU will be in what mode if the MASTER switch is placed ON in flight, but it is not actually started until on the ground?

A

Essential Mode

32
Q

If landing with the APU running, how long will it stay in the essential mode?

A

15 minutes

33
Q

When the APU is shut down using the STOP button, how long will it take to shut down?

A

1 minute

34
Q

Where does the APU receive its fuel?

A

From the motive flow line to the left fuel ejector?

Gulfstream G550 (18 decks)

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