APU

Question 1

How is the 40c11 and 40c14 controlled?

Answer 1

40c11- electronic sequencing unit

40c14- FADEC

Question 2

What is the APU oil system?

Answer 2

Self contained lubricating system integrated with an accessory gear box.

Question 3

Which tanks does the APU draw fuel from?

Answer 3

Right tank

Question 4

How much fuel does the APU burn?

Answer 4

95 - 160lbs per hour

Question 5

How can you close the APU fuel valve?

Answer 5

APU master knob off
APU stop button
APU fuel shut off button
APU fire extinguishing button
Fire test button + 10 seconds
Fire warning on ground -+ 10 sec.

Question 6

What style generator does the APU have?

Answer 6

28 volt dc style generator

Question 7

Can the APU generator replace engine generators?

Answer 7

Yes

Question 8

What side of the electrical system is the APU generator normally connected too?

Answer 8

The right side

Question 9

What happens when you press the stop button on the 40c11?

Answer 9

An overspeed signal is sent to the electronic sequencing unit.

Question 10

What happens when you press the stop button on the 40c14?

Answer 10

A stop signal is sent to the FADEC. The over speed protection is tested on start up.

Question 11

What has to happen before the master knob is turned off?

Answer 11

The APU is less than 5%

Question 12

When does the APU shut down on the ground?

Answer 12

Fire, over temp, overspeed, underspeed, fail to start, fail to accelerate, fail to light, loss of speed data, external short, loss of FADEC signal, FADEC failure, bleed opening, low oil, high oil temp, oil pressure short, loss of EGT.

Question 13

How will the APU shut down in flight?

Answer 13

Overspeed, underspeed, loss of speed, fail to start, fail to accelerate, fail to light, external short, loss of FADEC signal or failure.

Question 14

What are the two ducts for under the APU?

Answer 14

Left side compartment cooling right side starter cooling. When looking towards the tail.