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27 Cards in this Set
- Front
- Back
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Describe the APU
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Single stage impeller with 2 stage axial flow turbine
Provides pneumatic air and AC power Controlled by its own FADEC Contant speed |
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What kind of APU do we have
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Sunstrand APS2300
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What controls the APU
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Dedicated FADEC
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What battery is used for APU start
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Batt 1-Fadec and EICAS
Batt 2-APU starter |
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What is the fuel source for the APU
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Tank #2, RT. Tank
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What fuel pump is used for APU start
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Batt power only=DC Pump
AC power available-ACMP #2 RT engine running-Ejector pump #2 |
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Will the APU automatically shutdown if speed and acceleration rate isn't reached in starting time cycle
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Yes
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What does moving the APU start switch to OFF do
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Starts the APU shutdown sequence with a 1 minute cool down period, Pneuatics shutdown immediately, and electric shutdown after a minute
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Can the APU shutdown be cancelled
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Yes by moving the the start switch back to on before the one minute cool down is up
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What will automatically shutdown the APU on the ground
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Overspeed
Underspeed FIRE High EGT High OIL temp Low OIL pressure FADEC Critical Fault FADEC Sensor Fault |
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What will automatically shutdown the APU in flight
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Overspeed
Underspeed Fadec Critical Fault |
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Can the APU be started after a critical fault
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No
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What are the three ways to turn off the APU
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APU EMER STOP Button
APU FIRE EXT Button OFF Button |
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Does the APU have bleed priority on the ground
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Yes
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What battery does the APU starter use
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Battery #2
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What is the power output of the APU
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40KVA 115V 400HZ 3 phase
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When is the APU available after start
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When it has reached 95% RPM + 3 seconds
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What bus provides APU fire protection
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DC ESS Bus 2
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What bus provides APU fire detection
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DC ESS BUS 1 & 2
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What normally provides fuel to the APU when the engines are running
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Engine primary ejector pump
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What normally provides fuel to the APU when the engines are not running
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#2 AC fuel pump
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During an APU start what provides fuel to the APU
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#2 main fuel tank and a dedicated DC fuel pump
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What is the cool down period when the APU is selected to off
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1 minute pneumatics are removed immediately and electric remains for the minute
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Is it possible to feed the APU from the left wing tank
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Yes through the cross feed valve
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How long before the APU will shutdown with a fire detection on the ground
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10 seconds
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What would be observed on the flightdeck if the APU did an automatic shutdown on the ground for fire detection
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The APU would autoshutdown after 10 seconds and the red bar would show in the EMER STOP. If no action is taken after one minute the red bar will go out and the APU fire ext. button will turn red
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What does pushing the APU EMER STOP button
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Closes the APU FUEL SHUTOFF VALVE and bypasses the 1 minute cooldown period
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