Propellers Flashcards
What is the function of a propeller?
The propeller blades create thrust to pull or push an airplane through the air.
What is the difference between a fixed pitch propeller and a controllable pitch propeller?
The blade angle of a fixed pitch propeller cannot be changed by the pilot.
A controllable pitch propeller can be changed by the pilot and is usually controlled by a governor that maintains a constant speed; may provide reverse pitch, and feathering.
How are some wooden propeller blades protected from wear and damage?
By metal tipping fastened to the leading edge and tip.
What happens to the blade angle of a constant speed propeller during a constant power dive?
The blade angle increases to prevent an over speed
What are the functions of a constant speed propeller governor?
Boosts engine oil pressure before the propeller hub.
Senses rotational speed of propeller.
Adjusts oil flow to the propeller hub to change pitch. 
What is the purpose of propeller counterweights?
Centrifugal force acting on the counterweights causes the blade angle to increase.
What is meant when a propeller governor is in an on speed condition?
The governor is not accelerating or decelerating, and the speeder spring and fly weight forces are in balance.
How is a constant speed feathering propeller feathered?
By releasing oil pressure in the governor, the counterweights and feathering spring move the propeller into feather.
What is an unfeathering accumulator?
It is an oil accumulator used to provide oil pressure to unfeather a propeller
What is alpha range and beta range and where are they found?
Alpha and beta ranges pertain to operating modes of turboprop reversible pitch propellers.
Alpha range - propeller operates in standard, constant speed mode, which is usually in flight.
Beta range - propeller operates in zero or minimum thrust range and negative or reverse thrust mode, which is usually on the ground. 
What systems are commonly used for propeller ice control?
Fluid (alcohol).
Electrical heat applied to blade root.
What propeller repairs can be performed by a certified mechanic with a powerplant rating?
Only minor repairs and alterations.
How are wooden propellers generally cleaned?
With a brush or cloth and warm water with mild soap.
Where would you find the correct method and technique for cleaning aluminum propeller and hub?
The propeller manufacturer’s maintenance instructions
What type of nondestructive testing should be accomplished to a propeller after blending?
The procedures recommended by the manufacturer.
