ORAL *E145 APU

Question 1

Does APU have a FADEC?

Answer 1

Yes

Question 2

What causes APU Shut down on ground

Answer 2

HOTLOP…Failure to start, accelerate, or light. Loss of RPM data, external short, loss of FADEC signal or failure, loss of EGT. FIRE, Overtemp, overspeed

Question 3

APU Fire shuts it down on ground in how long?

Answer 3

10 seconds

Question 4

APU auto shutdown in flight?

Answer 4

over speed, 
over temp 
Failure to start, light, or accelerate,
Loss of RPM data
short
FADEC failure or loss of signal

Question 5

Loss of which buses would cause APU shutdown?

Answer 5

HOT BUS 1…immediate

ESS DC 2…6 seconds

Question 6

Which tank does APU draw fuel from

Answer 6

Right

Question 7

Can left tank supply APU fuel?

Answer 7

Yes, with Crossfeed valve

Question 8

APU OIL HI TEMP?

Answer 8

166C

Question 9

What does ON Position do?

Answer 9

Energizes FADEC, Opens fuel shutoff valve, and enables APU indications on EICAS

Question 10

What does OFF position do (APU)

Answer 10

De energizes FADEC, Closes fuel shutoff valve. Removes APU from EICAS if less than 5 % RPM, and commands shut down

Question 11

FADEC ignition? And open Main Fuel valve?

Answer 11

3% RPM on ground, 0% RPM in flight

Question 12

APU Starter cutout

Answer 12

50%

Question 13

APU Ignition Cutout

Answer 13

70%

Question 14

Power and Bleed available?

Answer 14

95%

Question 15

Normal APU Shutdown

Answer 15

STOP button, from a loaded condition

Question 16

APU Overspeed

Answer 16

104% Auto shutdown

Question 17

What does Stop button do.

Answer 17

Commands a stop request and closes fuel shutoff valve

Question 18

APU Fuel Shutoff?

Answer 18

Closes APU fuel shutoff valve

Question 19

WHY USE APU STOP?

Answer 19

EICAS messages remain

Question 20

Max Alt APU start

Answer 20

30k

Question 21

Max Operating altitude APU?

Answer 21

37k

Question 22

Max EGT during APU start

Answer 22

884C

Question 23

APU Max EGT continuous

Answer 23

680C

Question 24

EGT Exceedence limit?

Answer 24

717C for 5 minutes

Question 25

Minimum Battery temp for APU start

Answer 25

-20C

Question 26

Minimum temp for APU start with external power

Answer 26

-54C

Question 27

APU Starter Limits

Answer 27

3 attempts…1 minute cool down.

Must wait 30 minutes for 3 more attempts

Question 28

Start….

Answer 28

Turn to on, wait 3 seconds, then turn to STArt

Question 29

Normal Shutdown, When do you turn knob to off

Answer 29

After less than 5% RPM

Question 30

AHRS consideration

Answer 30

Wait 30 seconds for AHRS config before starting APU