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powerplant > Propellers (Turbine, Aux, Maintenance) > Flashcards

Propellers (Turbine, Aux, Maintenance) Flashcards

1
Q

What are the types of turboprop engines?

A

Single shaft.
Free turbine.

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2
Q

Types of control levers on a TPE331:

A

Power lever.
Condition/speed lever.

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3
Q

Power lever positions on a TPE331:

A

Reverse.
Ground idle.
Flight idle.
Maximum.

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4
Q

Condition lever positions for a TPE331:

A

Emergency shutoff.
Low RPM.
High RPM.

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5
Q

When does the power lever of a TPE331 control the prop pitch angle?

A

During ground operations.

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6
Q

Instruments to monitor on a TPE331:

A

Tachometer.
Torquemeter.
Fuel flow meter.
EGT indicator.

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7
Q

Define flat rated engine.

A

Turboprop engine whose allowable output is less than the engine is capable of producing.

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8
Q

Max power that a TPE331 is allowed to develop is limited by:

A

Amount of torque that airframe structure can accommodate.

Maximum temps turbine blades can withstand.

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9
Q

Range of operation of a turboprop powerplant normally used for in-flight approach and ground operations:

A

Beta mode

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10
Q

Flight operating mode for a turboprop powerplant from takeoff through landing:

A

Alpha mode.

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11
Q

Moving the TPE331 power lever forward has what effect on the prop?

A

Drains prop oil and increases pitch.

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12
Q

Moving the TPE331 power lever rearward has what effect on the prop?

A

Directs oil into the prop, decreasing pitch.

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13
Q

What component of a TPE331 automatically operates the feathering valve?

A

NTS (negative torque sensor)

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14
Q

Which turboprop propeller is allowed to go into its feather position when the engine is shut down?

A

PT6.

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15
Q

Why must the TPE331 propeller be held in low pitch when the engine is shut down?

A

To minimize the load on the starter due to its single shaft construction.

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16
Q

Why is the PT6 propeller allowed to feather when the engine is shut down?

A

The starter only rotates the gas generator turbine and is not loaded by the propeller.

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17
Q

What are the controls on the PT6?

A

Power control lever.
Propeller control lever.
Condition lever.

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18
Q

Full aft position of a PT6 propeller control lever does what?

A

Feathers the prop.

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19
Q

What are the settings of the PT6 condition lever?

A

Cutoff.
Idle.
Run.

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20
Q

Three types of reciprocating engine prop mounts:

A

Flanged.
Tapered.
Splined.

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21
Q

Safest propeller stopping position for hand-propping.

A

10 and 4.

22
Q

Functions of a spinner:

A

Engine aerodynamics streamlined.

Directs cooling air into cowlings.

23
Q

Components of the spinner assembly:

A

Spinner.
Spinner support.
Donut (shim)
Spinner bulkhead.

24
Q

How is the propeller hub centered on the shaft?

A

With two cones.

25
Q

The term used to describe the contact between the step of the cone taper and the internal propeller splines.

A

Bottoming.

26
Q

How much dye surface coverage is required to verify proper propeller seating on a tapered shaft?

A

No less than 70%

27
Q

What lever controls RPMs on a PT6?

A

Prop lever

28
Q

What lever adjusts idle speeds on the PT6?

A

Condition lever.

29
Q

What are the settings for the power lever on a PT6?

A

Reverse.
Ground idle.
Flight idle.
Takeoff.

30
Q

What does the Torquemeter measure?

A

Horsepower

31
Q

What should be done after shutting down the TPE331?

A

Spin prop by hand to force cool air through.

32
Q

The TPE331 idles at _____ and holds at _____ throughout flight.

A

95%.
100%

33
Q

TPE331 takeoff lever settings are what?

A

Power - max
Condition - high

34
Q

When is reverse required?

A

Slowing on descent.
Power backing.
Turning.
Stopping.

35
Q

Benefits of composite blades:

A

Lighter.
Wider variety of shapes.
Tolerates bending.

36
Q

Disadvantages of composite blades:

A

Expensive repair and manufacturing.

37
Q

4 ways to correct blade imbalance:

A

Add weights to cuffs.
Remove material from blade.
Pack lead into dowel pin holes.
Add weight to bulkhead.

38
Q

What should be inspected on a wood prop?

A

Looks for cracks across grain.
Look for laminate separations.
Warping.

39
Q

What is the RPM difference allowed between engines by the synchronizers?

A

150 RPMs

40
Q

How is synchrophasing achieved?

A

By slowing one prop via blade pitch.

41
Q

Components of an anti icing system:

A

Rheostat switch, pump, slinger ring, feed shoe.

42
Q

Places where anti icing may be used:

A

Propeller.
Windshield.
Carburetor.

43
Q

Heating sequence for de-icing of propeller:

A

Root to tip (prevents ice “run-back”)

44
Q

At what power percentage range does a PT6 operate?

A

50-100%

45
Q

Name the most common composite materials used to manufacture propeller blades.

A

Glass.
Graphite.
Kevlar.

46
Q

Where can the torque values for the propeller attaching nuts be found?

A

In the AIRFRAME maintenance manual.

47
Q

What must be done if the rear cone bottoms.

A

Tip of the cone must be machined off.

48
Q

What must be done if the front cone bottoms?

A

A spacer must be placed on the propeller shaft behind the rear cone.

49
Q

Most props installed on tapered shafts are what type?

A

Wood.

50
Q

What is used on the propeller hub to fit it to the tapered shaft?

A

A lapping compound (if dye test is failed)

51
Q

Two sources of propeller induced vibration:

A

Out-of-track condition.
Out-of-balance condition.

52
Q

If the prop edge is nicked, what should the length of the repair area be?

A

10 times the depth of the nick.

powerplant (19 decks)

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