APU Flashcards
APU starter cycle limit; __ attemps in __ minutes
3, 60
Fuel supply for APU is from where?
AC or DC pump from Left wing(main) tank
Max Altitude for APU Bleed air
17.000 ft
APU can be used up to which altitude and carry full generator load
42.000 ft
APU provides what?
Electrical power & bleed air
Where do you find APU EGT information
Status page of EICAS, lower EICAS
APU control, 2 lights, what are they?
RUN & FAULT light
What happens if you turn off APU battery switch while APU is still running
Automatic shutdown, no fire protection
APU shutdown sequence
Moving APU lever to OFF will immediately close apu bleed valve.
APU will start cool down to prevent thermal shock (up to 120s)
After cool down, APU will shut down and RUN light will extinguish
APU fire
Automatic shutdown without cool down,
Fire bell sounds
Master warning illuminates
EICAS messages: APU FIRE, APU FAULT
APU EICAS message: APU BLEED VAL, what does it mean
The APU BLEED VALVE is not in the commanded position
APU EICAS message: APU BTL, what does it mean
The apu fire bottle has been discharged or pressure is low
APU EICAS message: APU FAULT, what does it mean
The automatic protection system has been activated or a fire has been sensed
APU EICAS message: APU FUEL VAL, what does it mean
Apu fuel valve is not in the commanded position
APU EICAS message: APU GEN OFF, what does it mean?
The apu gen switch is off with power available or apu generator breaker is open due to a fault
APU start sequence
Apu bat switch on
Stby power rotary switch to AUTO
APU selector to start
(fault light will illuminate briefly - valve transit, RUN light will flash twice)
White APU RUN light will illuminate when APU is running at correct speed
press APU gen control switch on at elecs panel
press APU bleed switch on at pneumatics panel
APU powers which elec system; Left and/or Right ___Volts, AC or DC bus?
Both left adn right, 115 Volt AC bus.
APU bleed supplies which pack
Left pack, when crossfeed valve open also right side
Which battery do you need to start APU
Both Aircraft and APU batteries
What does the main battery provide?
power to:
DC fuel pump of left tank
APU fuel valve
fire protection
What does APU battery provide
Power to:
APU inlet door
APU starter
APU control circuits
Ef þú færð eld í startup, hvaða tjékklista tekur þú?
Engine tailpipe fire. EKKI engine fire checklist.
