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 force that creates thrust to push or pull the aircraft through the air

Question 3

what is a fixed pitch propeller

Answer 3

a fixed pitch propeller is one 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 controlled by a propeller governor, during a constant power drive

Answer 4

the blade angle increases to overcome overspeeding

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

blade tracking is determining 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 universal propeller protractor

Question 10

how should aluminum propeller blades and hubs be cleaned

Answer 10

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 balance in a propeller governor in an on-speed condition

Answer 12

speeder spring and 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 pith

Question 14

what happens to a constant speed feathering propeller when the propeller governor oil pressure drops to zero

Answer 14

the propeller will feather

Question 15

what does a typical constant speed propeller governor accomplish when operating

Answer 15

1. it boosts engine oil pressure before it enters the propeller hub
2. it controls the amount of oil that flows to the propeller
3. it senses the rotational speed of the engine

Question 16

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

Answer 16

the procedures recommended by the manufacturer

Question 17

what types of systems are used for propeller ice control

Answer 17

fluid (alcohol) and electrical

Question 18

to what do the terms “alpha range” and “beta range” pertain

Answer 18

both terms pertain to operating modes of turboprop reversible-pitch propellers

Question 19

what is alpha range of a turboprop

Answer 19

the alpha range is operation in the constant speed mode (usually inflight)

Question 20

what is the beta range

Answer 20

the beta range is operation in the minimum or zero thrust, and negative (reverse) thrust modes (usually for ground handling or taxi)

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 feathering 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 the criteria used by 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 the blade station location

Question 24

what may be used to remove repair file 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 a mild soap together with a brush and cloth