Propellers

Question 1

How are some wooden propeller blades protected from wear and damage

Answer 1

By metal attached to the leading edge and tip

Question 2

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

Answer 2

The blade angle increases to prevent an overspeed

Question 3

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

Answer 3

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

Question 4

What is the purpose of counterweights

Answer 4

Centrifugal force acting on the counterweight increases the blade angel

Question 5

What is an unfeathering accumulator

Answer 5

provides oil pressure to unfeather a propeller

Question 6

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

Answer 6

Only minor repairs and alterations

Question 7

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

Answer 7

Propeller manufacturers maintenance instructions

Question 8

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

Answer 8

Procedures recommended by the manufacturer

Question 9

How can repair file marks be removed from an aluminum propeller

Answer 9

With very fine sandpaper

Question 10

What is a propeller protractor used for

Answer 10

Measure propeller blade angle

Question 11

What blade conditions can cause engine vibration

Answer 11

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

Question 12

What is blade tracking

Answer 12

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

Question 13

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

Answer 13

The throttle

Question 14

What are two types of propeller configurations

Answer 14

Tractor and pusher

Question 15

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

Answer 15

Fixed pitch

Question 16

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

Answer 16

To protect the propeller from damage caused by foreign object damage

Question 17

What tool is used to determine propeller blade angle

Answer 17

Universal propeller protractor

Question 18

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

Answer 18

Centrifugal twisting, torque bending, and centrifugal forces

Question 19

What is meant by blade back and face

Answer 19

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.

Question 20

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

Answer 20

Washed with cleaning solvent using a brush or cloth

Question 21

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

Answer 21

Vertical or horizontal position

Question 22

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

Answer 22

Maintenance manual for the propeller

Question 23

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

Answer 23

Low pitch

Question 24

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

Answer 24

High pitch

Question 25

What is meant by bata range of a turboprop propeller

Answer 25

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

Question 26

Hat is meant by alpha range of a turboprop propeller

Answer 26

In flight mode from take of to landing

Question 27

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

Answer 27

Low pitch , high RPM position

Question 28

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

Answer 28

Major repair

Question 29

May a transverse cracks in a metal propeller blade be repaired

Answer 29

No

Question 30

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

Answer 30

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

Question 31

What is the function of a propeller

Answer 31

create thrust to pull or push an airplane through the air

Question 32

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

Answer 32

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

Question 33

How is a constant speed feathering propeller feathered

Answer 33

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

Question 34

What system are commonly used for propeller ice control

Answer 34

Alcohol and electrical heat applied to the propeller root