An APU Quiz For All Aspiring Pilots And Plan Technicians Out There!
An Auxiliary Power Unit or APU allows an aircraft to operate autonomously without reliance on ground support equipment such as a ground power unit, an external air-conditioning unit or a high pressure air start cart. Take this quiz to check your knowledge about the same!
- 1.What are you waiting for during the two-minute period during shuhtdown of the APU?
- A.
Stabilization of the APU
- B.
The oil pressure to drop within limits
- C.
The bleed air ducts to cool down
- D.
The APU load control valve to fully shut
- 2.What technical order covers the APU and it's operation?
- A.
1C-130H-2-05JG-00-1
- B.
1C-130H-2-49JG-00-1-1
- C.
1C-130H-2-12JG-10-2
- D.
1C-130H-2-71JG-00-1
- 3.The boost pump must be turned on when operating the APU with less than _______ pounds of fuel in the #2 tank
- A.
4,000
- B.
3,000
- C.
2,000
- D.
1,000
- 4.The minimum DC voltage for the aircraft's batteries are?
- A.
21
- B.
22
- C.
24
- D.
28
- 5.Where does the APU receive it's fuel from?
- A.
The APU fuel tank
- B.
The RH AUX tank
- C.
The #2 main tank
- D.
The fuel cross-feed manifold
- 6.Do not hold the agent discharge switch to #1 or #2 position for more than two seconds during emergency shutdown procedures, if there is a fire.
- A.
True
- B.
False
- 7.How is the APU fire detected?
- A.
A flashing fire warning light and a steady light in the T-Handle
- B.
A steady fire warning light and a steady light in the T-Handle
- C.
A steady fire warning light and a flashing light in then T-Handle
- D.
A flashing fire warning light and a flashing light in the T-Handle
- 8.The entire APU oil system hold approximately how many quarts of oil?
- A.
2 US quarts
- B.
3 US quarts
- C.
6 US quarts
- D.
5 US quarts
- 9.What is the APU starter duty cycle?
- A.
1 minute on and 1 minute off
- B.
1 minute on and 2 minutes off
- C.
1 minute on and 3 minutes off
- D.
1 minute on and 4 minutes off
- 10.What happens at 35% RPM during APU starting?
- A.
The start light goes out
- B.
The start light comes on
- C.
The on speed light comes on
- D.
The on speed light goes out
- 11.What happens at 95% RPM during APU starting?
- A.
The APU automatically shuts down
- B.
The over-speed light comes on
- C.
The on-speed light comes on
- D.
The on-speed light goes out
- 12.How many mechanics are required to operate the APU?
- A.
One
- B.
Two
- C.
Three
- D.
Four
- 13.The area around the APU inlet door should be inspected for?
- A.
Ice
- B.
General APU condition
- C.
Foreign Objects
- D.
All of the above
- 14.The purpose of the APU is to provide _______.
- A.
Hydraulic pressure for ground operation
- B.
Electrical power for starting engines
- C.
Electrical and hydraulic power to various sections of the aircraft
- D.
Bleed air for engine starting and ground operations
- 15.Do not hold the AGENT DISCHARGE switch for more than ____ seconds or you may cause the fire extinguisher circuit breaker to trip.
- A.
One
- B.
Two
- C.
Three
- D.
Four
- 16.What must be done before pressurizing the bleed air manifold?
- A.
Clear the propeller area
- B.
Check the ramp area
- C.
Close the #2 fuel cross-feed
- D.
Call for clearance from the control tower
- 17.What is the purpose of draining the fuel strainer sump prior to the first start of the day?
- A.
To check the fuel for contamination and water
- B.
To ensure the APU has proper fuel flow
- C.
To ensure the APU fuel shut-off valve is in the open position
- D.
To ensure the APU fuel shut-off valve is in the closed position
- 18.If while testing the bleed air pressure ducts, on aircraft prior to AF83-0486 except planes modified by TO 1C-130-1653, the time of the pressure drop is 8.5 seconds or greater, you should _____________
- A.
Try to isolate the problem to aid in troubleshooting
- B.
Not operate the bleed air
- C.
Shut down the APU
- D.
Do nothing, it is within limits
- 19.Where is the bleed air manifold pressure gauge located?
- A.
On the overhead electrical panel
- B.
Near the Navigator's control station
- C.
On the pilot's main instrument panel
- D.
Aft of the left troop door
- 20.Normally which radio is used for emergency communications?
- A.
ADF
- B.
HF
- C.
SCNS
- D.
UHF
- 21.What is the quantity of the APU oil system and tank?
- A.
3 US Quarts
- B.
4 US Quarts
- C.
5 US Quarts
- D.
6 US Quarts
- 22.The start light should go out within _____ minutes
- A.
One
- B.
Two
- C.
Three
- D.
Four
- 23.If the start light doesn't go out within its specified time, the APU will be shut down and allowed to cool for _____ minute(s)
- A.
One
- B.
Two
- C.
Three
- D.
Four
- 24.Exceeding what percent RPM will cause the APU to shutdown and possibly re-light with a loud bang?
- A.
35% speed switch
- B.
95% speed switch
- C.
105% speed switch
- D.
110% speed switch
- 25.If the APU fire warning system is not operating properly ________.
- A.
Do not operate the APU
- B.
Have ground man monitor APU and proceed
- C.
Have an extra person visually monitor the APU
- D.
Document aircraft forms and proceed with caution
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