APU questions
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| What kind of APU is on the aircraft? | • Sundstrand APS 2300
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| Describe the APU | • Constant speed• Single-stage impeller with a 2-stage axial-flow turbine• Independent oil system
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| What controls the APU? | • A dedicated FADEC
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| What battery is used for the APU start? | • BATT 2 powers the starter• BATT 1 powers the FADEC and EICAS for monitoring
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| What is the fuel source for the APU? | • Right fuel tank• Left fuel tank through the crossfeed valve
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| What fuel pump is used for APU start? | • Batteries ‘ON’ only DC fuel pump in right tank• AC powered airplane ACMP 2 • Right engine running Ejector fuel pump
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| Will the APU shutdown automatically if speed and acceleration rate isn’t reached in starting cycle time? | • Yes
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| What does moving the APU start switch to ‘OFF’ do? | • Initiates normal APU shutdown• 1-minute cool down• No pneumatics (electrics only for 1 minute)
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| Can the APU shutdown be cancelled? | • Yes, by moving the START switch back to ‘ON’ before the 1-minute cool down is over
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| How is the APU shutdown immediately? | • APU emergency stop button• No 1-minute cool down period
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| What will happen if batteries are turned OFF during the 1-minute cool-down period? | • APU will shut down immediately
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| When will automatic shutdown of the APU occur?Ground: | • Ground: Overspeed Underspeed FADEC critical fault Fire Overheat Low oil pressure
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| When will automatic shutdown of the APU occur?Flight: | • Flight: Overspeed Underspeed FADEC critical fault
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| Can the APU be started after a critical fault? | NO
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