题目内容
词汇与结构APU allows the aircraft to be independent of______ pneumatic and electrical power supplies.
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词汇与结构The aircraft battery also supplies control circuitry power when the APU battery voltage______ because of heavy starter motor load.
词汇与结构An amber FAULT light on the APU control panel ______ whenever a fault or fire is sensed.
词汇与结构When the inlet door is fully open, an electric starter engages, and the APU ______ to its normal operating speed.
词汇与结构The starter duty cycle is a maximum of 3 ______ starts or attempts within a 60 minute period with a 5 minute cooling period between attempts.
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