ATA 49 APU Flashcards
Describe the APU engine configuration.
Single Spool Engine
Single Stage Load Compressor
Single Centrifugal Compressor
Two Stage Turbine
Describe the APU engine mount configuration.
Three Cone Bolt Type Mounts.
During start when does the APU starter/generator cutout?
70%
The APU fuel system provides pressurized fuel to the fuel nozzles and ________
Servo fuel for the Inlet Guide Vane actuator and Surge Control Valve
When does the APU ignition start and stop?
The ECU energizes the ignition system at 0% speed and de-energizes it at 60% speed.
The APU bleed valve is __________ controlled and ______________ operated?
Solenoid, load compressor air
List the three components that control pneumatic airflow out of the APU.
Main engine start
Air Conditioning
Pressurization
Where is the APU bleed valve located?
Forward right side of the APU. Access is through the APU cowl door.
Where is APU EGT displayed?
MDS
Maint display pages
List three of the many protective shutdowns that also cause the APU FAULT light
to illuminate.
APU Fire
APU inlet overheat
No APU rotation
One of the EGT thermocouples has failed, will the APU shutdown?
Nope
What is the purpose of the Data Memory Module?
Keeps specific APU data in non-volatile memory
Describe the APU exhaust duct installation.
V-Band clamp holds exhaust to the APU duct muffler assembly.
The APU FCU is mounted to the ________________________________.
Mounts to the front of the lube module with a V-band clamp
The Lube Module has two filters, what are they for?
Generator Filter Element-Filtering oil from the APU generator
Oil Filter Element-Filters pressurized oil after its gone through the oil cooler
