170 APU

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The flashcards below were created by user jascott246 on FreezingBlue Flashcards.


  1. What kind of APU is on the aircraft?
    Sundstrand APS 2300
  2. Describe the APU
    • • Constant speed
    • • Single-stage impeller with a 2-stage axial-flow turbine
    • • Independent oil system
  3. What controls the APU?
    A dedicated FADEC
  4. What battery is used for the APU start?
    • BATT 2 powers the starter

    • BATT 1 powers the FADEC and EICAS for monitoring
  5. What is the fuel source for the APU?
    • Right fuel tank

    • Left fuel tank through the crossfeed valve
  6. 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
  7. Will the APU shutdown automatically if speed and acceleration rate isn’t reached in starting cycle time?
    yes
  8. 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)
  9. Can the APU shutdown be cancelled?
    Yes, by moving the START switch back to ‘ON’ before the 1-minute cool down is over
  10. How is the APU shutdown immediately?
    • APU emergency stop button

    • No 1-minute cool down period
  11. What will happen if batteries are turned OFF during the 1-minute cool-down period?
    APU will shut down immediately
  12. When will automatic shutdown of the APU occur?
    • • Ground:
    • 􀂃 Overspeed
    • 􀂃 Underspeed
    • 􀂃 FADEC critical fault
    • 􀂃 Fire
    • 􀂃 Overheat
    • 􀂃 Low oil pressure
    • • Flight:
    • 􀂃 Overspeed
    • 􀂃 Underspeed
    • 􀂃 FADEC critical fault
  13. Can the APU be started after a critical fault?
    no

Card Set Information

Author:
jascott246
ID:
334657
Filename:
170 APU
Updated:
2017-09-30 11:51:59
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170 APU
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Description:
170 APU
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