900 APU Flashcards
The APU compartment is made of
Titanium
When are the RPM and EGT gauges shown on the EICAS status page
Upon selection of the APU PWR/FUEL switchlight
APU Max operating altitude (900)
41,000’
Max altitude for starting APU (900)
37,000’
Max altitude for bleed air (900)
25,000’
Fuel for the APU comes from
The left collector tank
Where is the inlet door located
Upper left side of the rear fuselage
What does the air inlet door ram air provide air for
APU operation
And
Oil cooling
What happens when the power fuel switch light is pressed
APU IN BITE STATUS MSG
APU SOV STATUS MSG
RPM/EGT gauges
Door opens
APU fuel pump turns on
What happens when the start stop switch light is pressed
Starter is energized(
APU START MSG)
Ignition
Fuel introduced
Start legend on the APU panel comes on
When the start stop switch light is selected to stop the APU
The APU will automatically shed it’s loading and shut down
When the power fuel switch light is deselected
The fuel shut off valve closes
Power is removed from the ECU
Minimum ambient temperature for starting?
-40c
How many starts in one hour?
Three starts or start attempts in any hour
What is the primary purpose of the APU?
Electrical power and air for engine starts
