E190 APU/ENGINES

Question 1

What is the APU starting envelope limited to?

Answer 1

30,000ft

Question 2

Where does the APU get its electricity to start?

Answer 2

Battery 2
Or
DC external cart

Question 3

How high can we go with APU on?

Answer 3

33,000ft

Question 4

Does APU stay at constant speed or change speeds?

Answer 4

Constant speed

Question 5

What’s on the gearbox assembly?

Answer 5

AC gen and oil pump assembly

Question 6

Does the APU use FADEC?

Answer 6

You bet

Question 7

Is there a cool down period when the emergency stop button is pressed?

Answer 7

No

Question 8

How do you know there’s an APU fire?

Answer 8

There’s a red bar on the guarded EMER STOP button

Question 9

During start at 7% what happens?

Answer 9

FADEC commands fuel module open and energize the exciter

Question 10

What happens during APU start at 50%?

Answer 10

Ignition is over and starter de energizes, APU runs on its own

Question 11

What happens during APU start at 95% plus 3 sec?

Answer 11

Electric and air available

Question 12

What happens to power and air when you turn master sw to OFF?

Answer 12

Air shuts off immediately
1 min cool down
If power avail-immediate xfer
If no power avail-1 min of power

Question 13

Can APU do it’s automatic shutdown in the air?

Answer 13

Yes but not for all the same reasons

Question 14

What causes APU to automatically shut down on ground?

Answer 14

Overspeed
FADEC critical fault
Fire
EGT overtemp
Sensor failure
High oil temp
Low oil pressure

Question 15

Max alt for APU air conditioning?

Answer 15

15,000ft

Question 16

Pushing the emergency stop button on the APU causes what?

Answer 16

Immediately stops APU

Question 17

During normal APU shutdown what services are available?

Answer 17

Electrics only

Question 18

What happens when you press EMER STOP button?

Answer 18

Closes APU fuel SOV
No 1 min cool down
White stripe in lower half of button

Question 19

Taxiing to the gate and FO selects STOP eng 2, but it doesn’t stop. What might be the problem?

Answer 19

Thrust lever not at idle

Question 20

Can the engines be shut down with thrust levers in reverse?

Answer 20

No. Only idle

Question 21

In flight what happens if ignition is selected OFF?

Answer 21

Nothing, FADEC will disregard

Question 22

What does ignition OVRD do in flight?

Answer 22

Continuous relight both igniters