Turbine Powered Auxilary Power Units Flashcards

1
Q
  1. What is the typical relationship between aircrafts auxiliary power unit generator and the engine Driven generator?
A

Identical

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2
Q
  1. Where does the APU fuel supply normally come from?
A

Airplanes main fuel supply

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3
Q
  1. How does the APU rotate during start up?
A

Electric starter

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4
Q
  1. What is the function of an APU air inlet plenum?
A

To stabilize pressure of air before it enters compressor

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5
Q
  1. When operating at high loads, what is the speed of an APU?
A

At or near constant speed regardless of load

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6
Q
  1. What is the effect of the pneumatic power when being used in conjunction with maximum APU shaft power output?
A

Pneumatic loading will automatically modulate to maintain safe EGT

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7
Q
  1. Before shutting down, how would APU cooling be accomplished?
A

Closing the bleed air valve

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8
Q
  1. When is most of the load placed on an APU?
A

Bleed air is opened

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9
Q
  1. What regulates fuel scheduling during APU start and under varying pneumatic bleed and electrical loads?
A

APU fuel control stystem

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10
Q
  1. How is most troubleshooting accomplished on modern APUs?
A

FADEC

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11
Q
  1. What is the primary function of the load compressor on APUs equipped with a free turbine and load compressor?
A

Provide bleed air for pneumatic systems

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12
Q
  1. To prevent rotor seizure shock cooling how long should an APU idle before being shut down?
A

3-5 minutes

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13
Q
  1. What is the function of the APU on a modern transport category aircraft?
A

Provides bleed air for engine starting, air conditioning, and de icing

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