Propellers Flashcards
How are some wooden propeller blades protected from wear and damage
By metal attached to the leading edge and tip
What happens to the blade angle of a constant speed propeller during a constant power drive
The blade angle increases to prevent an overspeed
What is meant when a propeller governor is in an on speed condition
Governor is not accelerating or decelerating and the speeder spring and flyweight forces are in balanced
What is the purpose of counterweights
Centrifugal force acting on the counterweight increases the blade angel
What is an unfeathering accumulator
provides oil pressure to unfeather a propeller
What propeller repair can be performed by a certified mechanic with a powerplant rating
Only minor repairs and alterations
Where would you find the correct method and technique for cleaning an aluminum propeller and hub
Propeller manufacturers maintenance instructions
What type of nondestructive testing should be accomplished to a propeller after blending
Procedures recommended by the manufacturer
How can repair file marks be removed from an aluminum propeller
With very fine sandpaper
What is a propeller protractor used for
Measure propeller blade angle
What blade conditions can cause engine vibration
propeller out of track or balance, and incorrect blade angle setting
What is blade tracking
It compares the position of the propeller blade tips relative to each other
What controls both manifold pressure and r.p.m on an engine equipped with a fixed pitch propeller
The throttle
What are two types of propeller configurations
Tractor and pusher
What type of propeller has the blade angle built into the propeller and cannot be changed
Fixed pitch
What is the purpose of the metal tipping on a leading edge of a wooden propeller
To protect the propeller from damage caused by foreign object damage
What tool is used to determine propeller blade angle
Universal propeller protractor
What are the aerodynamic forces and loads acting on a rotating propeller blade
Centrifugal twisting, torque bending, and centrifugal forces
What is meant by blade back and face
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.
What should be used to clean steel and aluminum propellers and hubs
Washed with cleaning solvent using a brush or cloth
What position are used on a balance stand to check a two bladed propeller for static balance
Vertical or horizontal position
Where do you find a list of lubricants that are approved for use in a constant speed propeller
Maintenance manual for the propeller
Does the centrifugal twisting moment tend to move the blade toward high pitch or low pitch
Low pitch
Do counterweights on a propeller tend to move the blades toward high pitch or low pitch
High pitch
What is meant by bata range of a turboprop propeller
Ground operation and includes taxiing, starting, and ground reverse operation
Hat is meant by alpha range of a turboprop propeller
In flight mode from take of to landing
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
Low pitch , high RPM position
What would be the classifications of maintenance for shortening a propeller blade
Major repair
May a transverse cracks in a metal propeller blade be repaired
No
How are small nicks removed from the leading edge of a propeller blade
File them out with a fine file or stone leaving a smooth contour
What is the function of a propeller
create thrust to pull or push an airplane through the air
What’s the different between fixed pitch and controllable pitch propellers
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
How is a constant speed feathering propeller feathered
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
What system are commonly used for propeller ice control
Alcohol and electrical heat applied to the propeller root
