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ERJ 170 APU syst.

APU questions

What kind of APU is on the aircraft? • Sundstrand APS 2300
Describe the APU • Constant speed• Single-stage impeller with a 2-stage axial-flow turbine• Independent oil system
What controls the APU? • A dedicated FADEC
What battery is used for the APU start? • BATT 2 powers the starter• BATT 1 powers the FADEC and EICAS for monitoring
What is the fuel source for the APU? • Right fuel tank• Left fuel tank through the crossfeed valve
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
Will the APU shutdown automatically if speed and acceleration rate isn’t reached in starting cycle time? • Yes
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)
Can the APU shutdown be cancelled? • Yes, by moving the START switch back to ‘ON’ before the 1-minute cool down is over
How is the APU shutdown immediately? • APU emergency stop button• No 1-minute cool down period
What will happen if batteries are turned OFF during the 1-minute cool-down period? • APU will shut down immediately
When will automatic shutdown of the APU occur?Ground: • Ground: Overspeed Underspeed FADEC critical fault Fire Overheat Low oil pressure
When will automatic shutdown of the APU occur?Flight: • Flight: Overspeed Underspeed FADEC critical fault
Can the APU be started after a critical fault? NO
Created by: rah170