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Auxiliary power unit

FAA AMP

QuestionAnswer
Generally, when maxium APU shaft output power is being used in conjuction with pneumatic power Pneumatic loading will be automatically modulated to maintain a safe EGT
an AOU is usually rotate during start by an electric starter
usually, most of the load placed on an apu occurs when the bleed air valve is opened
when in operation, the speed of an APU remains at or near rated speed regardless of the load conditions
fuel scheduling during APU start and under varying pneumatic bleed and electrical load is maintained automatically by the APU fuel contol sys.
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 sys.
the function of an APU air inlet plenum is to stabilice the pressure of the air before it enters the compressor
frequently, an aircraft's auxiliary power unit (APU) generator is identical to the engine-driven generators
when necessary, APU engine cooling before shutdown may be accomplished by clossing the bleed air valve
fuel is normally supplied to an APU from the Airplane's main fuel tank
Created by: cordon.gabriel
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