Auxillary Power Unit(APU)

Question 1

APU description

Answer 1

Question 2

How much power does the APU generator provide?

Answer 2

75 KVA, 3-phase, 115 VAC, electrical power at a constant 400Hz

Question 3

APU Fuel control unit and Filter Manifolds

Answer 3

Question 4

APU Starter:

Answer 4

Question 5

APU Air Oil Cooler

Answer 5

Question 6

APU Ignition Unit

Answer 6

Question 7

APU Surge Control Valve

Answer 7

Question 8

APU Bleed Air Valve

Answer 8

Question 9

APU main components:

Answer 9

Question 10

APU operation

Answer 10

Question 11

APU Electronic Control Unit(ECU)

Answer 11

Question 12

APU Inlet door position

Question 13

APU Accessory Gearbox

Answer 13

Operates the following components:

1. Generator
2. Fuel control unit
3. Starter

Question 14

Where is the APU fuel supplied from

Answer 14

From the left tank through the APU fuel line and fuel shutoff valve.

Question 15

APU Oil System

Answer 15

Question 16

APU Start Power Sources

Answer 16

Question 17

APU Shutdown Sequence

Answer 17

Question 18

APU External controls

Answer 18

There are two APU shutdown switches:

Question 19

Highest altitude for bleed air extraction?

Answer 19

FL230

Question 20

How many start attempts are allowed on the APU?

Answer 20

No more than 3 start attempts in 1 hour; 2 min delay must be observed between start attempts.

Question 21

How much fuel does APU burn per hour?

Answer 21

80 kg/hr or 200 lbs/hr