APU Flashcards
Which model APU does the ERJ145 have?
Sundstrand T-62T-40C14
What controls the C-14 APU?
FADEC
How is the APU lubricated?
The APU has a self contained lubrication system totally integrated into the accessory gearbox
Which wing tank provides the fuel supply for the APU?
Right wing tank
What are the EGT temperature limitations for the APU?
884C for start, 680C for continous operations which can be exceeded up to a temperature of 717C for a maximum of 5 min
What are the APU starter limits?
1 min off the first three consecutive attempts, 30 minutes off between two series of three consecutive attempts
What are the amperage load limits of the APU?
400 amp below 30,000 ft and 300 amp above 30,000 ft
What are the memory items for an APU FIRE?
APU Fuel Shutoff valve - PUSH
What is the normal method of shutting down the APU?
Pressing the APU stop button
What RPM should the APU be indicating before the master knob can be moved to the OFF position?
Below 10%
What is the maximum altitude for APU starting?
30,000 ft
What is maximum altitude for APU operation?
37,000 ft
What is the maximum altitude for APU operation?
37,000 ft
List the APU critical faults which will command an in flight shutdown
-FADEC failure
-Loss of FADEC signal
-Overspeed/Underspeed
-Failure to light/start
-External short
-Failure to accelerate
-Loss of speed data
List the APU major faults which will command an on the ground shutdown
-Low oil pressure
-EGT overtemperature
-High oil temperature
-Oil pressure switch or thermocouple shorted
-Loss of EGT data
-Bleed valve open
-Fire
