Flashcards in APU Deck (13):
What kind of APU is on the Aircraft?
Sundstrand APS 2300
Describe the APU
-Constant speed drive
-Single stage impeller with a stage 2 axial-flow turbine
-Independent Oil system
What controls the APU?
A dedicated FADEC
What battery is used for 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?
What does moving the APU start switch to OFF do?
-Initiates normal APU shutdown
-1 minute cool down
-No pneumatics (electrics for 1 minute)
Can the APU shutdown be cancelled?
Yes, by moving the START switch back to ON beofre 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 shutdown immediately
When will automatic shutdown of the APU occur?
-FADEC Critical fault
High/Low oil pressure
-FADEC critical fault