# Oral 2 Flashcards

1
Q

If you are flying along and get an AC BUS annunciator, what has happened?

A

You lost the associated AC bus

2
Q

While flying the left GEN TIE OPEN illuminates, what has happened with regard to the center bus?

A

The left generator bus has been isolated from the center bus.

3
Q

What powers the cockpit emergency lights?

A

The Battery or Duel-Fed bus

4
Q

What is normal generator voltage?

A

28.25 VDC

5
Q

With the Battery Switch OFF and the BATTERY BUS switch in EMER OFF, what should the BATTERY BUS voltage read?

A

0 VDC

6
Q

What does a flashing EXT PWR annunciator mean?

A

The GPU is electrically disconnected from the aircraft.

7
Q

What must the battery voltage read to perform a GPU start?

A

at least 20 VDC

8
Q

What is the min battery voltage for a battery start?

A

23 VDC

9
Q

What will happen if you forget to turn off the starter, during a start, and try to bring a generator online?

A

Nothing. You cannot bring a generator online with the start on.

10
Q

What does the crossbreed valve do during an engine start?

A

It prevents compressor stalls. The axial flow compressor produces more pressure, at low RPM, than the centrifugal compressor can handle.

11
Q

When should engine oil be checked to ensure an accurate reading?

A

Within 10 minutes after engine shutdown.

12
Q

MAX ITT for engine start.

A

1000C for 5 seconds

13
Q

If I’m flying along and I notice that the oil pressure on one of my engines is less than 60 psi, what should I do?

A

Oil pressure of less than 60 psi is unsafe. An engine shutdown should be considered.

14
Q

If I’m flying along and I notice that the oil pressure on one of my engines reads between 60 and 90 psi, what should I do?

A

Oil pressure between 60 and 90 psi is undesirable: tolerate only for the completion of the flight. Do not exceed 62% power.

15
Q

What is the minimum oil pressure at idle?

A

60 psi

16
Q

What is the maximum torque for 20 seconds?

A

156 %

17
Q

The compressor section on the PT6A-60A has what type of compressors?

A

One, 3 stage axial flow and one centrifugal

18
Q

How many turbines are on the PT6A-60A engine.

A

2 power turbines and 1 compressor turbine

19
Q

Is the shaft that drives the gearbox and prop the same shaft that drives the accessory case on the back of the engine?

A

NO. It is a split shaft engine.

20
Q

At what torque setting doest the engine auto-ignition come on?

A

below 17 % torque

21
Q

During preflight, you notice the engine is 5 qts low. What should you do?

A

Start the engine and run it for 2 minutes and recheck the oil.

22
Q

Can you mix different types of oil in the engine?

A

NO

23
Q

If you are sitting in the aircraft with the battery off and you push the FIREWALL VALVE, what happens?

A

The fire extinguisher will arm.

24
Q

Which bus powers the engine fire detection system?

A

Triple Fed Bus

25
Q

When will the auto-feather system arm during takeoff?

A

When the power levers are advanced beyond a position corresponding to 88% (87-89%)

26
Q

What governor controls the prop speed in the event the prop becomes fixed pitch?

A

The Fuel-topping Governor

27
Q

What governor regulates the prop RPM in reverse?

A

the Fuel-topping governor to 95% of selected RPM.

28
Q

The overspeed governor governs at 104% of max N2 or prop RPM. This is approximately what RPM?

A

1768

29
Q

Prop pitch when feathered?

A

79.3

30
Q

Prop pitch at flight idle?

A

12

31
Q

Prop pitch in ground idle?

A

2

32
Q

Prop pitch in reverse?

A

-14

33
Q

If the prop becomes fixed-pitch, the Fuel-topping Governor will regulate RPM (N2) at approximately how much higher and lower?

A

6% higher than selected by the governor and 5% lower for minimum speed.