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10 Cards in this Set
- Front
- Back
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Generally, when maximum APU shaft output power is being used in conjunction with pneumatic power |
Pneumatic loading will be automatically modulated to maintain safe EGR |
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Fuel is normally supplied to an APU from the |
Airplanes main fuel tank |
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The function of an APU air plenum is to |
Stabilize the pressure of the air before it enters the compressor |
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Usually, most of the load placed on an APU occurs when |
The bleed air valve is opened |
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An APU is usually rotated during start by |
An Electric starter |
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Frequently, an aircraft’s auxiliary power unit (APU) generator |
Is identical to the engine-driven generators |
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Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained |
Automatically by the APU fuel control system |
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When in operation the speed of an APU |
Remains at or near rated speed regardless of the load condition |
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On APU’s equipped with a free turbine and load compressor, the primary function of the load compressor is to |
Provide bleed air for aircraft pneumatic systems |
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When necessary, APU engine cooling before shutdown may be accomplished by |
Closing the bleed air valve |
