APU Flashcards
What action should you take if the utility pressure light has not gone out within 30 seconds after the APU ready light comes on?
APU switch off and wait one minute before attempting another start
What are the three accessories of the APU?
-motor/pump
-generator
-fuel control
What does the APU RDY light indicate?
APU is up to speed (magnet sensor)
APU exhaust gas temperature is normal (EGT probe)
Auxiliary power unit
APU Accessory Drive
APU Hydraulic Motor Pump
APU Generator
APU Fuel Control
APU Ignition Exciter/igniter
APU Motor Pump
APU Start Module
APU Start Accumulator
Name of circular pan on bottom of APU
Oil sump
what info should be entered on the -13 if the APU start is not completed or the APU is automatically shut down
The BITE information from the DESU
what component sequences and monitors the APU start and operation
Digital Electronic Sequencing Unit
When is the APU restricted from use
in flight except during emergencies (engine restart during flight)
what does the APU RDY light indicate
APU is up to speed, APU exhaust gas temperature is normal
What info does the magnetic pickup send to the DESU
speed signal
What provides fuel to the APU Fuel Control
left main fuel tank
what 2 components on the APU provide a constant signal to the DESU
Magnetic pickup, Exhaust Gas Temperature
