Flashcards in E190 APU/ENGINES Deck (22)
What is the APU starting envelope limited to?
Where does the APU get its electricity to start?
DC external cart
How high can we go with APU on?
Does APU stay at constant speed or change speeds?
What’s on the gearbox assembly?
AC gen and oil pump assembly
Does the APU use FADEC?
Is there a cool down period when the emergency stop button is pressed?
How do you know there’s an APU fire?
There’s a red bar on the guarded EMER STOP button
During start at 7% what happens?
FADEC commands fuel module open and energize the exciter
What happens during APU start at 50%?
Ignition is over and starter de energizes, APU runs on its own
What happens during APU start at 95% plus 3 sec?
Electric and air available
What happens to power and air when you turn master sw to OFF?
Air shuts off immediately
1 min cool down
If power avail-immediate xfer
If no power avail-1 min of power
Can APU do it’s automatic shutdown in the air?
Yes but not for all the same reasons
What causes APU to automatically shut down on ground?
FADEC critical fault
High oil temp
Low oil pressure
Max alt for APU air conditioning?
Pushing the emergency stop button on the APU causes what?
Immediately stops APU
During normal APU shutdown what services are available?
What happens when you press EMER STOP button?
Closes APU fuel SOV
No 1 min cool down
White stripe in lower half of button
Taxiing to the gate and FO selects STOP eng 2, but it doesn’t stop. What might be the problem?
Thrust lever not at idle
Can the engines be shut down with thrust levers in reverse?
No. Only idle
In flight what happens if ignition is selected OFF?
Nothing, FADEC will disregard