Auxiliary Power Unit

Question 1

The type of APU installed is a _____.

Answer 1

Honeywell 36-150BD

Question 2

The primary function of the APU is to _____.

Answer 2

start the engines

Question 3

The APU fuel burn is _____ lb/hr.

Answer 3

150

Question 4

Is there an external APU shutoff?

Answer 4

Yes—on the External Power Control Panel,
below the right engine.

Question 5

The APU gets fuel from _____

Answer 5

the right collector tank

Question 6

Fuel is fed to the APU fuel pump via the _____.

Answer 6

right DC fuel pump until RT engine is running,
then the main ejector pump supplies the
pressurized fuel

Question 7

When the airplane is being de-iced prior to departure, consider that _____.

Answer 7

de-icing with the APU running is prohibited

Question 8

Prior to starting the APU, ensure a minimum battery voltage of _____ volts.

Answer 8

> 20

Question 9

The APU provides the following 4 functions: _____.

Answer 9

-Bleed air for air conditioning
-Pressurization
-Engine start
-DC power

Question 10

What is the only fire bottle dedicated to the APU?

Answer 10

The number 2 bottle

Question 11

Is the APU fire protection system automated while on the ground and while the extinguisher discharge

Answer 11

Yes, and the extinguisher 5 seconds after shutdown.

Question 12

Can the APU be operated with the APU generator inoperative?

Answer 12

Yes per the MEL

Question 13

When starting the APU, the right battery _____ and the left battery _____

Answer 13

PBA shows OFF and is powering only the APU starter

Is powering the rest of the aircraft, including the start logic for the APU

Question 14

_____ total start attempt(s) is/are allowed for the APU on the ground, limited to _____.

Answer 14

three

1 min cooling between attempts, then
20 min cooling, two start attempts with 1 min
cooling between attempts, then 40 min cooling

Question 15

How many times are allowed to start the APU in the air?

Answer 15

Once