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Powerplant > Propellers > Flashcards

Propellers Flashcards

1
Q

How are some wooden propeller blades protected from wear and damage

A

By metal attached to the leading edge and tip

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2
Q

What happens to the blade angle of a constant speed propeller during a constant power drive

A

The blade angle increases to prevent an overspeed

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3
Q

What is meant when a propeller governor is in an on speed condition

A

Governor is not accelerating or decelerating and the speeder spring and flyweight forces are in balanced

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4
Q

What is the purpose of counterweights

A

Centrifugal force acting on the counterweight increases the blade angel

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5
Q

What is an unfeathering accumulator

A

provides oil pressure to unfeather a propeller

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6
Q

What propeller repair can be performed by a certified mechanic with a powerplant rating

A

Only minor repairs and alterations

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7
Q

Where would you find the correct method and technique for cleaning an aluminum propeller and hub

A

Propeller manufacturers maintenance instructions

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8
Q

What type of nondestructive testing should be accomplished to a propeller after blending

A

Procedures recommended by the manufacturer

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9
Q

How can repair file marks be removed from an aluminum propeller

A

With very fine sandpaper

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10
Q

What is a propeller protractor used for

A

Measure propeller blade angle

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11
Q

What blade conditions can cause engine vibration

A

propeller out of track or balance, and incorrect blade angle setting

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12
Q

What is blade tracking

A

It compares the position of the propeller blade tips relative to each other

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13
Q

What controls both manifold pressure and r.p.m on an engine equipped with a fixed pitch propeller

A

The throttle

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14
Q

What are two types of propeller configurations

A

Tractor and pusher

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15
Q

What type of propeller has the blade angle built into the propeller and cannot be changed

A

Fixed pitch

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16
Q

What is the purpose of the metal tipping on a leading edge of a wooden propeller

A

To protect the propeller from damage caused by foreign object damage

17
Q

What tool is used to determine propeller blade angle

A

Universal propeller protractor

18
Q

What are the aerodynamic forces and loads acting on a rotating propeller blade

A

Centrifugal twisting, torque bending, and centrifugal forces

19
Q

What is meant by blade back and face

A

Curved side of propeller blade is back it’s the side that faces away from the engine. The flat side of the propeller blade is face and it faces the engine.

20
Q

What should be used to clean steel and aluminum propellers and hubs

A

Washed with cleaning solvent using a brush or cloth

21
Q

What position are used on a balance stand to check a two bladed propeller for static balance

A

Vertical or horizontal position

22
Q

Where do you find a list of lubricants that are approved for use in a constant speed propeller

A

Maintenance manual for the propeller

23
Q

Does the centrifugal twisting moment tend to move the blade toward high pitch or low pitch

A

Low pitch

24
Q

Do counterweights on a propeller tend to move the blades toward high pitch or low pitch

A

High pitch

25
Q

What is meant by bata range of a turboprop propeller

A

Ground operation and includes taxiing, starting, and ground reverse operation

26
Q

Hat is meant by alpha range of a turboprop propeller

A

In flight mode from take of to landing

27
Q

When making a magneto check on a engine equipped with a constant speed propeller should the propeller control be in low pitch or high pitch position

A

Low pitch , high RPM position

28
Q

What would be the classifications of maintenance for shortening a propeller blade

A

Major repair

29
Q

May a transverse cracks in a metal propeller blade be repaired

A

No

30
Q

How are small nicks removed from the leading edge of a propeller blade

A

File them out with a fine file or stone leaving a smooth contour

31
Q

What is the function of a propeller

A

create thrust to pull or push an airplane through the air

32
Q

What’s the different between fixed pitch and controllable pitch propellers

A

Fixed pitch has a built In Blade angle that cannot be changed by the pilot. Only by the repair station or manufacturer.

Controllable pitch can be changed by the pilot and is usually controlled by a governor that maintains a constant speed. Some also provide reverse pitch and feathering

33
Q

How is a constant speed feathering propeller feathered

A

Releases oil pressure in the governor, the counterweights and feathering spring move the propeller into feather. This happens automatically if governor oil pressure drops to zero. Can be manually controlled by pilot if engine fails

34
Q

What system are commonly used for propeller ice control

A

Alcohol and electrical heat applied to the propeller root

Powerplant (13 decks)

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