APU

Question 0

What is the ground frequency on uhf that should be used during operation of the apu?

Answer 0

308.6

Question 1

What job guide do you use for operation of the apu?

Answer 1

1c-130h-2-49jg-00-1

Question 2

Where does the apu get its fuel from?

Answer 2

2 tank

Question 3

T or F as a minimum the dc voltmeter should read 21 volts prior to operation of the apu

Answer 3

True

Question 4

At what percentage rpm does the start light go out?

Answer 4

35%

Question 5

At what percentage rpm does the on speed light illuminate?

Answer 5

95%

Question 6

What is the operating range in volts for the apu generator during operation

Answer 6

112-118 volts

Question 7

What is the duty cycle for the apu starter?

Answer 7

1 minute on 4 minutes off, do not engage starter until rpm is 0

Question 8

What electrical bus powers the apu starter?

Answer 8

Essential dc bus

Question 9

If a prop rotates when you open the bleed air manifold what should you do?

Answer 9

Rotate bleed air valve/BL AIR switch to OFF

Question 10

Can you still operate the apu if the fire warning system does not operate?

Answer 10

No

Question 11

Where is the apu located?

Answer 11

Left side of aircraft forward of MLG door

Question 12

What must you inspect on the apu air inlet?

Answer 12

Inspect inlet for ice or foreign material on the inlet screen

Question 13

Can you still operate the apu if the fuel shut-off valve had failed in the open position?why?

Answer 13

No, damage to equipment and injury to personnel could occur.

Question 14

What mist be done prior to pressurizing the bleed air manifold?

Answer 14

Place all ac/bleed air switched to off and clear all props

Question 15

How much oil is in the apu system?

Answer 15

6 us quarts

Question 16

T or F There must be at least 1500lbs in any main tank before operating the apu?

Answer 16

False! At least 2000lbs in #2 tank

Question 17

T or F Hold the agent discharge switch for three seconds after pulling fire handle when apu is on fire?

Answer 17

False! Dont hold agent discharge/agent disch switch No.1 or No.2 for more than two seconds.

Question 18

How do you ensure the apu fuel shutoff valve is closed before the first start of the day?

Answer 18

Press the “fuel strainer valve” to fuel strainer. Verify fuel flow stops.

Question 19

What happens at 35% rpm?

Answer 19

Start light goes out.

Question 20

What happens at 95% rpm?

Answer 20

On speed light comes on and stays on.

Question 21

What happens at 110% rpm?

Answer 21

Apu will shut down and may relight with a loud bang, this cycle will repeat until apu is shutdown and governed speed reduced.

Question 22

Highest EGT limit of apu?

Answer 22

620 degrees Celsius

Question 23

Bleed down time?

Answer 23

8.5 seconds no less

Question 24

1 engine prop starts rotating when you turn the apu bleed air switch to the “on” position, what do you do now?

Answer 24

Turn bleed air switch to off position

Question 25

Battery voltage reads 17.5V what do you have to do?

Answer 25

Use external power and or charge battery to at least 21V

Question 26

When are the the ac plugs removed for apu operation?

Answer 26

Prior to start of apu

Question 27

T or F external electrical power has to be on before apu operation.

Answer 27

False, equipment conditions does not require it and you can start apu with battery, but if available, yes.

Question 28

Allow apu to run for at least __ minutes after on speed light comes on

Answer 28

Two