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29 Cards in this Set
- Front
- Back
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Describe the APU?
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Sundstrand APS 2300
Constant speed Single-stage impeller with a 2-stage axial-flow turbine Independent oil system Gas Turbine Engine |
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What controls the APU?
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A dedicated FADEC
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What battery is used for the APU start?
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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?
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Right fuel tank
Left fuel tank through the crossfeed valve |
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What fuel pump is used for APU start?
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Batteries ON only : DC fuel pump in right tank
AC powered airplane: ACMP 2 Right engine running: Right ejector pump |
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Will the APU shutdown automatically if speed and acceleration rate isn't reached in starting cycle timer?
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Yes
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What does moving the APU start switch to OFF do?
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Initiates normal APU shutdown
1 minute cool down No pneumatics |
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Can the APU shutdown be cancelled?
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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?
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APU emergency stop button
No 1 minute cool down |
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What will happen if batteries are turned OFF during 1 minute cool down?
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APU will shut down immediately
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When will automatic shutdown of the APU occur? Ground: 8
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Overspeed
Underspeed FADEC critical fault Fire High oil temperature Low oil pressure Sensor fail EGT overtemperature |
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When will automatic shutdown of the APU occur?
Flight: |
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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Does the cool down period apply to the EMER Stop push button to the APU?
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No
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What is indicated by an illuminated red bar in the upper half of the EMER Stop button?
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APU fire
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When does APU electrical and pneumatic loading become available?
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3 seconds after AU speed has reached 95%.
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What indication would you have after an APU auto shutdown?
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An APU FAIL message on the EICAS.
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Will the APU auto shutdown in flight for an APU fire?
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No
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Min-Max OAT to start the APU
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-54C to ISA +35C
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Max altitude to start the APU
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30,000
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Min- Max temperature to use the APU once it is started
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-62C to ISA +35C
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Max Altitude to use APU for:
Electrical Bleed To assist Engine Start |
Electrical 33000
Bleed 15,000 Assist Start 21000 |
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Max APU rotor speed
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108%
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Max EGT for APU start
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1032C
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Max continuous EGT
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717C
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APU starter duty cycle
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1st and 2nd - 60 sec ON followed by 60 seconds OFF
3rd start 60 seconds ON followed by 5 min OFF |
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What is the power output of the APU; V and kVA
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115V
40kVA |
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What does pushing in the APU Emergeny Stop Button do?
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Closes the APU fuel shutoff valve, shutting down the APU with no cool down period. A white striped bar illuminates on the lower half of the button.
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Describe in your own words the operation of the APU
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Air inters and is compressed, the air is then ignited and the exhaust powers the rotors which turn the impeller.
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