APU Flashcards
The APU supplies pneumatic power for
Main engine starts and air conditioning
The APU is equipped with a:
40 KVA generator
The APU ECU electronic control unit controls the APU during
All phases of operation
The APU control system ensures priority is given to
Electric loads
Pressurized fuel is supplied to the APU by the
APU fuel pump
What is the purpose of the internal bypass valve?
Allows the APU to continue to run if APU pump fails because the bypass spring opens
APU RPM is displayed on the
EICAS status page
APU bleed air is controlled by modulating
APU LCV load control valve
APU bleed pressure readout can be monitored on
EICAS “ECS” environmental control system Synoptic page
APU “avail” will illuminate at
99% RPM and 2 seconds later
The APU gauges RPM and EGT appear on EICAS when
APU POWER/FUEL switch/light is pressed in
APU OVERSPEED warning message is displayed when RPM exceeds:
106%
Where is the APU located?
Tail one
APU intake door is located:
Upper right hand side of aircraft
APU secondary function
B and c: supplies bleed air for air conditioning and starting the engine