Propellers

Question 1

How do you determine the reparability of a damaged propeller blade?

Answer 1

By reference to the manufacturer’s maintenance manual.

Question 2

What is the purpose of propellers?

Answer 2

The blades produce forces that create thrust to pull or push the plane through the air.

Question 3

What is a fixed pitch propeller?

Answer 3

A propeller that has a built-in blade angle that cannot be changed.

Question 4

What type of blade angle change will occur on a propeller that is pitch controller by a propeller governor during a constant power dive?

Answer 4

In a constant power dive, the blade of the angle will increase to overcome the overspeed condition.

Question 5

Other than maintaining constant speed, what are two actions of some controllable propellers?

Answer 5

Reverse pitch and feathering

Question 6

What is the purpose of metal tipping fastened to a wooden propeller leading edge and tip?

Answer 6

To protect the propeller from damage.

Question 7

When engine vibration is reported, what should be checked to determine if it is caused by the engine or propeller?

Answer 7

Blade tracking and blade angle setting.

Question 8

What is blade tracking?

Answer 8

A process to determine the positions of the propeller blade tips in relation to each other.

Question 9

What may be used to determine blade angle?

Answer 9

A propeller protractor

Question 10

How should aluminum propeller blades and hubs be cleaned?

Answer 10

The propeller should be cleaned in accordance with the manufacturer’s recommendations.

Question 11

What positions of a two bladed propeller are used during a static balance test?

Answer 11

Vertical and horizontal

Question 12

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

Answer 12

Speeder spring tension and centrifugal force on the flyweight.

Question 13

On light aircraft propellers, what is the effect of centrifugal force acting on propeller blade counterweights?

Answer 13

Centrifugal force acting on the counterweights serves to increase propeller blade pitch.

Question 14

What happens to a constant speed feather propeller governor if oil pressure drops to zero?

Answer 14

The propeller will feather.

Question 15

What three things does a typical constant speed propeller governor accomplish when operating?

Answer 15

It boosts engine oil pressure before it enters the propeller hub, controls the amount of oil that flows into the propeller, and has a sense of the rotational speed of the engine.

Question 16

What types of systems are used for propeller ice control??

Answer 16

Fluid and electrical

Question 17

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

Answer 17

The procedures recommended by the manufacturer.

Question 18

To what do the terms alpha range and beta range pertain?

Answer 18

Both terms pertain to operating modes of a turboprop reversible pitch propellers.

Question 19

What is the alpha range of a turboprop?

Answer 19

The alpha range is operation in the constant speed mode.

Question 20

What is the beta range of a turboprop?

Answer 20

The beta range is operation in the minimum or zero thrust, and negative (reverse) thrust modes.

Question 21

What is the purpose of an oil accumulator connected to a propeller governor?

Answer 21

To provide unfeathering oil pressure.

Question 22

How is feather accomplished on a constant speed propeller?

Answer 22

Releasing the governor oil pressure allows the counterweights and feathering spring to feather the propeller.

Question 23

What are two criteria used by many manufacturers to determine the amount of bend damage that can be repaired by cold bending of aluminum propellers?

Answer 23

The extent of the bend and its blade station location.

Question 24

What may be used to remove repair files marks from aluminum propellers?

Answer 24

Very fine sandpaper.

Question 25

What can be used to clean a wooden propeller?

Answer 25

Warm water and mild soap together with a brush or cloth.