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Propellers Review > Second Part of Review > Flashcards

Second Part of Review Flashcards

1
Q

How do you retract propeller latches in the Garrett Engine?

A

Propeller latches retract by easing the power lever toward the reverse position

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2
Q

What are the two designs of turboprop engines?

A

Direct Drive and Free Turbine

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3
Q

How does the Direct Drive type work?

A

Power section is driven directly through a fixed shaft of the integral turbine

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4
Q

How does the Free Turbine type work?

A

Power section is driven by a separate free turbine (power turbine). Free turbine is driven by exhaust gases from gas turbine section

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5
Q

What is the governing system of a turboprop engine?

A

All turboprop engines use constant-speed, feathering propellers controlled by one or more governors

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6
Q

What does the fuel control work with on a turboprop?

A

Fuel control works with the propeller governor to control prop blade angle

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7
Q

What does the thrust lever control at speeds above flight idle?

A

Both the fuel flow and the propeller blade angle are controlled by the thrust lever

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8
Q

What does the thrust lever control at speeds below flight idle?

A

Thrust lever controls prop blade angle at speeds below flight idle

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9
Q

When a reversible pitch propeller is operated in the standard constant speed mode, it is said to be operating in ________ mode

A

Alpha

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10
Q

If a turboprop is operating in the “reverse” range, which mode is it in?

A

Beta

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11
Q

Which instruments are used for turboprop engines?

A

Torque, and Additional RPM indication

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12
Q

Is the PT6 direct drive or free turbine type?

A

Free Turbine

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13
Q

What is the Ng (Gas generator RPM) of the PT6?

A

38,000 RPM

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14
Q

What is the NP (Propeller RPM) of the PT6?

A

2200 RPM

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15
Q

What position are the propellers places in upon shutdown for a free-turbine engine?

A

Propeller blades are placed in a feathered position upon shutdown

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16
Q

What spins during start up of a free turbine engine?

A

Only the compressor and its turbine are rotated by the starter, but the power turbine DOESN’T turn.

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17
Q

Are there pitch stops on a free-turbine engine?

A

No

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18
Q

What does the overspeed governor do?

A

This governnor uses a speeder spring a flyweight arrangement to prevent the propeller from overspeeding

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19
Q

What happens when you advance the power lever?

A

Increses fuel flow schedule of FCU and increases blade angle through the walking beam

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20
Q

What happens when you advance the power lever after flight idle?

A

After flight idle, the cambox enters the constant radius position of the slot and no further movement of the walking beam is possible

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21
Q

How is feathering accomplished on turboprop engines on older engines?

A

Feathering is accomplished by lifting the pilot valve and mechanically forcing valve upwards to dump control oil

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22
Q

How is feathering accomplished on more modern engines?

A

Plunger valve on governor is pushed by the CSU, allowing propeller servo oil to dump into the reduction gearbox sump. The pressure loss in the propeller hub causes the feathering spring in the propeller hub and the propeller blade counterweights to feather the propeller quickly

23
Q

What is the master unit and what does it consist of?

A

Has a master motor which mechanically drives 4 contact units, each connected to an alternator. The frequency of the voltage by the alternator controls the speed of the engine

24
Q

After you activate the master unit, what is the pilot’s job?

A

Pilot manually adjusts RPMs until the master tachometer on the instrument panel indicates the desired speed

25
Q
A
26
Q

What does a typical propeller deicing system consist of?

A

Control unit, Tank, pump

27
Q

What is the most common anti icing fluid?

A

Glycol based

28
Q

What does the Loadmeter do?

A

Ammeter that permits monitoring of individual circuit currents and visual verification of proper time of operation

29
Q

How does the electric propeller de-ice?

A

Supplies aircraft system power to the propeller hub through a set of brush blocks and slip rings

30
Q

Which part of the electric prop deicing system rotates and which is stationary?

A

Slip rings rotate, brush blocks are stationary

31
Q

What is a danger of electric propeller deicing when not applied properly?

A

Runback

32
Q

What is runback?

A

Where melted ice reforms behind a blade’s leading edge. If applied heat is more than that required to loosen the ice but insufficient to evaporate all the resulting water can run back over the unheated blade surface and freeze again

33
Q

Why do we have a gear reduction assy?

A

Keeps blade tips subsonic

34
Q

What is the advantage of turboprops over turbofans?

A

Shorter takeoff and landing, more efficiency for shorter operations

35
Q

Why does the direct drive system have NTS (Negative Torque System)?

A

Measures if the prop is turning the engine

36
Q

What are the levers in the flight deck of an airplane that has Garrett engines?

A

Power and condition

37
Q

What does the Power lever do for a Garrett engine?

A

Power lever controls fuel flow

38
Q

What does the condition lever do for a Garrett Engine?

A

Controls engine RPM

39
Q

What does the power lever control for the Garrett engine on the ground (Beta Mode)?

A

Power lever controls RPM and Pwr

40
Q

What happens in an underspeed condition for a Garrett Engine?

A

Governor only increases oil pressure and sends oil to hub

41
Q

How do you get fine pitch on a Garrett engine?

A

Oil pressure

42
Q

What happens in an onspeed condition for the Garrett engine?

A

Governor controls propeller pitch

43
Q

What makes the prop go into feather on a Garrett engine?

A

Counterweights

44
Q

What position would pilots shut engine down in a Garrett engine?

A

Fine pitch, because it makes it easier to start since it’s a direct drive engine, so the starter has to turn the propeller.

45
Q

How are pitch stops actuated?

A

Reverse pitch selection allows pitch stops to engage through Spring pressure, and disengagement is done through centrifugal force

46
Q

If engine is put into coarse/feather before shutdowm, what do you do before you start engine (Garrett)?

A

Unfeather props first by using an unfeathering pump

47
Q

What puts blades into feather during shutdown on the PT6 Engine?

A

Spring press., counterweights, oil drains back to engine

48
Q

How do the components control prop pitch in Beta mode?

A

Beta valve operated by walking beam which is operated by power lever and cam box assy.

49
Q

How does the prop switch to Alpha?

A

Enters constant radius section in cam box

50
Q

What happens in the underspeed condition of a PT6 engine?

A

Pilot valve bypasses beta valve. Walking beam and carbon block and feedback ring assy control beta valve

51
Q

On an aircraft equipped with a PT6 engineand hartzell prop combustion, what drives the prop?

A

The free turbine

52
Q

Where would you find out if something needed a dual?

A

CARs

53
Q

Synchronizing and Synchrophasing: Green band on ammeter, what does it indicate?

A

Correct current draw range

Propellers Review (2 decks)

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