Powerplant Systems & Components: Propellers πŸ”Š Flashcards

1
Q

What is the purpose of a propeller?

A

To create thrust and either pull or push the airplane through the air

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2
Q

What are two types of propeller configurations?

A

Tractor type and pusher type

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3
Q

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

A

Fixed pitch propeller

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4
Q

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

A

To protect the propeller from FOD damage

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5
Q

What tool is used to determine propeller blade angle?

A

Universal propeller protractor

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6
Q

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

A

A rotating propeller is acted upon by centrifugal force, aerodynamic twisting, centrifugal twisting, torque bending, and thrust bending forces

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7
Q

What is the meaning of propeller blade β€œback” and β€œface”?

A

The curved side, facing away from the engine is the blade back. The flat side facing the engine and pilots is the blade face.

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8
Q

What should be used to clean aluminum and steel propeller blades and hubs?

A

A suitable cleaning solvent using a brush or cloth

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9
Q

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

A

First the vertical position, then the horizontal position

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10
Q

Can a fixed pitch propeller’s pitch be changed?

A

No

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11
Q

Why do you put the blades of a counterweight propeller into high pitch before stopping the engine?

A

The propeller has a moveable cylinder that slides over a fixed piston. In the high pitch position, the cylinder moves inboard and covers the piston protecting it from exposed air, dirt, and moisture

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12
Q

Why are cones installed on splined shafts with a propeller?

A

The cones center the propeller on the shaft

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13
Q

How is feathering accomplished on a constant speed counterweight propeller?

A

By releasing the governor oil pressure on the counterweights. The feathering spring moves the blades to the feathered position and the oil returns to the engine.

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14
Q

What types of systems are used for deicing propellers?

A

Fluid or electrical deicing systems

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15
Q

What is the purpose of a slinger ring on some propeller installations?

A

Deicing fluid is ejected from a stationary nozzle on the engine into a u-shaped channel attached to the rear of the propeller assembly. The u-shaped channel is called the slinger ring.

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16
Q

What is blade tracking?

A

The process of determining the position of the tips of the propeller blades relative to each other

17
Q

Do the counterweights on a constant speed propeller increase or decrease the blade angle?

A

The centrifugal forces of the counterweight increase the pitch of the blades

18
Q

What should you adjust if a pilot requests 50 more RPM on an aircraft equipped with a constant speed propeller?

A

Adjust the governor’s prop-level set screw

19
Q

What adjustments are powerplant mechanics allowed to make to the prop governor?

A

The maximum RPM stop

20
Q

What are propellers indexed to the crankshaft for an engine?

A

To reduce vibrations

21
Q

Can transverse cracks in a propeller be repaired?

A

No

22
Q

What is the alpha range and beta range of a propeller?

A

Beta range is the condition of the propeller during ground operations and in the reverse pitch position. Alpha range is propeller position in flight.

23
Q

When changing metal bushings on a wooden propeller assembly, a thorough inspection of the bolt holes should be accomplished. Why?

A

To check for elongation

24
Q

What happens to a constant speed feathering propeller when the propeller governor’s oil pressure drop to 0 PSI?

A

It returns to the feathered position

25
Q

What is the purpose of an arbor when balancing a propeller?

A

To support the propeller on the balance knives

26
Q

What two forces are balanced in a propeller governor in an on-speed condition?

A

Speeder spring and flyweights