E190 APU/ENGINES Flashcards Preview

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Flashcards in E190 APU/ENGINES Deck (22)
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1

What is the APU starting envelope limited to?

30,000ft

2

Where does the APU get its electricity to start?

Battery 2
Or
DC external cart

3

How high can we go with APU on?

33,000ft

4

Does APU stay at constant speed or change speeds?

Constant speed

5

What’s on the gearbox assembly?

AC gen and oil pump assembly

6

Does the APU use FADEC?

You bet

7

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

No

8

How do you know there’s an APU fire?

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

9

During start at 7% what happens?

FADEC commands fuel module open and energize the exciter

10

What happens during APU start at 50%?

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

11

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

Electric and air available

12

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

13

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

Yes but not for all the same reasons

14

What causes APU to automatically shut down on ground?

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

15

Max alt for APU air conditioning?

15,000ft

16

Pushing the emergency stop button on the APU causes what?

Immediately stops APU

17

During normal APU shutdown what services are available?

Electrics only

18

What happens when you press EMER STOP button?

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

19

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

20

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

No. Only idle

21

In flight what happens if ignition is selected OFF?

Nothing, FADEC will disregard

22

What does ignition OVRD do in flight?

Continuous relight both igniters