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650 > Week 3 Part 1 > Flashcards

Week 3 Part 1 Flashcards

1
Q

What type of APU is installed on the G650?

A

RE220

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2
Q

What altitude will the APU provide electrical power up to?

A

45000ft

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3
Q

What altitude will the APU provide pneumatic power up to?

A

45000ft

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4
Q

What is the max APU EGT on start?

A

1050 degrees

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5
Q

What is the max APU EGT during operation?

A

732 degrees

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6
Q

What percentage RPM does over speed protection kick in at?

A

106%

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7
Q

What are the 4 APU drains? (EBIF)

A
  • enclosure
  • bearing witness
  • inlet plenum
  • fuel control
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8
Q

What clearance is required around the APU exhaust nozzle?

A

0.075”

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9
Q

Which cowl open switch inhibits APU start?

A

Right

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10
Q

How long will the APU continue to run if you remove panels?

A

10 mins

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11
Q

Will the APU start with panels removed?

A

No

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12
Q

What signal determines whether the APU is in normal or essential modes?

A

WOW from the LGCU

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13
Q

When will the APU be in ESS mode?

A

If something that would have caused shut down on the ground happens in flight

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14
Q

What power source does the APU use for start on the ground?

A

Left battery

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15
Q

What PSID does the APU fuel bypass DPI pop at?

A

7.5 psi

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16
Q

What does the APU sit on in the APU bay?

A

Teflon rails

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17
Q

What is the APU enclosure made from?

A

Titanium

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18
Q

What side of the aircraft is the APU exhaust?

A

Right

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19
Q

Where is the APU surge control valve exhaust?

A

Within the main APU exhaust

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20
Q

What provides 100% in flight start recovery no later than what attempt?

A

2nd

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21
Q

Where is the APU ECU?

A

Forward BEER

22
Q

When is the APU nite performed?

A

When master selected on

23
Q

If APU is in ESS mode in flight, how long will it stay that way after landing?

A

15 mins

24
Q

When the APU is selected off, how long is 28V DC power latched for?

A

5 mins

25
Q

When does the APU starter cut out?

A

46% RPM

26
Q

Where is the APU fuel SOV?

A

Left hopper

27
Q

When does the APU fuel shut off solenoid open during start?

A

5% RPM

28
Q

What is APU gearbox capacity?

A

5.10 quarts

29
Q

What gearbox oil level initiates protective shutdown?

A

<2.&5 quarts

30
Q

What temp does the APU oil temp sensor extend starter engagement to adjust for oil viscosity?

A

-23.3 degrees

31
Q

What temp does the oil temp sensor shut down the APU in non ESS mode?

A

> 149 degrees

32
Q

What position is the APU fuel flow divider at 5% and 25% RPM?

A
  • 5% - closed to ensure all fuel to primary manifold

- 25% - open to split fuel between primary and secondary manifold

33
Q

How many fuel atomisers in the APU combustion chamber?

A

10

34
Q

Above 30000 feet, when fuel demands are low, what does the APU fuel flow divider do?

A

Closes

35
Q

What pressure does the fuel high pressure relief valve trip on shutdown? (Allows fuel back to pump inlet)

A

250psi

36
Q

What does the gearbox PRV regulate oil pressure at? What pressure does it relieve excess pressure?

A
  • 67 +/- 7.5

- 240 +/- 40

37
Q

When does the APU oil deprime solenoid operate?

A
  • open at
38
Q

If the oil deprime solenoid is stuck open, when will this cause an APU shutdown?

A

Non ESS mode

39
Q

When does the APU oil pressure switch cause APU shutdown is non essential mode?

A

<30psi for >15 seconds

40
Q

What does the APU surge control valve do?

A
  • vents compressor discharge air above 16500 feet

- opens at 70% RPM when trying to start above 19,200 feet and

41
Q

What do red and gold mean with regards to starter brush wear indication?

A
  • red good

- gold bad

42
Q

At 60% RPM, if the starter is not disengaged, what happens?

A

APU starter engaged CAS and aborted start

43
Q

How Longdown you have to leave it before APU start attempts?

A

15 mins

44
Q

What is the APU ignition unit output?

A

3000 volts

45
Q

At _% RPM, APU ignition burst mode is in effect for 5-6 seconds, then _____ mode is in effect for the remainder of the start sequence

A
  • 5

- maint

46
Q

The APU monopole (speed sensor) is a _________ generator. It provides ___ speed signals to the APU ECU

A
  • frequency

- two

47
Q

What happens if you lose one and both speed signals from the APU monopole?

A
  • one = blue CAS

- two = shut down in all modes

48
Q

If you lose both EGT thermocouples, what happens in both ESS and non ESS modes?

A
  • non-ESS shuts down

- ESS no shutdown and defaults to a 260 degree fuel schedule

49
Q

When does the APU hourmeter come online?

A

95% RPM

50
Q

If replacing the APU hourmeter, what happens to APU calculations?

A

Take removed hourmeter shouts and add to new running total

51
Q

In ESS mode, when is ignition terminated?

A

98% RPM

52
Q

Can you dispatch with a failed APU?

A

Yes but must have 2 good IDG’s and a RAT. Also no extended range ops

650 (9 decks)

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