EMB120 APU System

Question 1

What APU does our aircraft have?

Answer 1

Garrett Turbine Engine Company

Question 2

How much HP does the APU have?

Answer 2

25HP

Question 3

What does the APU use for cooling while on the ground and where is it located?

Answer 3

The APU has a ground cooling fan attached to the starter generator

Question 4

When will the APU auto shutdown in the air?

Answer 4

Overspeed

overvoltage

Question 5

What is the fuel burn of the APU with generator running and the bleeds open?

Answer 5

100 lbs/hr +30% (130lbs/hr)

Question 6

How is the APU cooled?

Answer 6

Inflight cooled by airflow

on the ground cooled by the ground cooling fan

Question 7

When will the APU Auto shutdown on the ground?

Answer 7

Fire
Fire Bell longer then 10 sec
low oil pressure
high oil temp 
overcurrent 
overvoltage 
overspeed
loss of speed sensor 
over temp during start
loss of EGT sensor
Loss of EDC 28VDC power

Question 8

What happens if you hold the fire test button for to long?

Answer 8

If fire bell rings for 10 sec or longer the APU will shit down. If the alarm is canceled before 10 sec auto shutdown will not happen

Question 9

Recomened battery voltage for starting APU?

Answer 9

24 volts

22volts Min

Question 10

What is the max altidude and speed the apu can be stated at?

Answer 10

up to 20,000ft and 200knts

Question 11

At what RPM does the APU overspeed

Answer 11

110%

Question 12

What happens when you press the APU shutoff button?

Answer 12

Simulates overspeed 110%

Question 13

What does the “able” light indicate on APU panel/fire panel?

Answer 13

Bottle is good to use, squib is in good condition