propellers Flashcards
how do you determine the reparability of a damaged propeller blade
by reference to the manufacturer’s maintenance manual
what is the purpose of propellers
the blades produce force that creates thrust to push or pull the aircraft through the air
what is a fixed pitch propeller
a fixed pitch propeller is one that has a built in blade angle that cannot be changed
what type of blade angle change will occur on a propeller, that is pitch controlled by a propeller governor, during a constant power drive
the blade angle increases to overcome overspeeding
other than maintaining constant speed, what are two actions of some controllable propellers
reverse pitch and feathering
what is the purpose of metal tipping fastened to a wooden propeller leading edge and tip
to protect the propeller from damage
when engine vibration is reported, what should be checked to determine if it is caused by the engine or propeller
blade tracking and blade angle setting
what is blade tracking
blade tracking is determining the positions of the propeller blade tips in relation to each other
what may be used to determine blade angle
a universal propeller protractor
how should aluminum propeller blades and hubs be cleaned
in accordance with the manufacturer’s recommendations
what positions of a two bladed propeller are used during a static balance test
vertical and horizontal
what two forces are balance in a propeller governor in an on-speed condition
speeder spring and flyweight
on light aircraft propellers, what is the effect of centrifugal force acting on propeller blade counterweights
centrifugal force acting on the counterweights serves to increase propeller blade pith
what happens to a constant speed feathering propeller when the propeller governor oil pressure drops to zero
the propeller will feather
what does a typical constant speed propeller governor accomplish when operating
- it boosts engine oil pressure before it enters the propeller hub
- it controls the amount of oil that flows to the propeller
- it senses the rotational speed of the engine
what types of nondestructive testing should be accomplished to a propeller after blending
the procedures recommended by the manufacturer
what types of systems are used for propeller ice control
fluid (alcohol) and electrical
to what do the terms “alpha range” and “beta range” pertain
both terms pertain to operating modes of turboprop reversible-pitch propellers
what is alpha range of a turboprop
the alpha range is operation in the constant speed mode (usually inflight)
what is the beta range
the beta range is operation in the minimum or zero thrust, and negative (reverse) thrust modes (usually for ground handling or taxi)
what is the purpose of an oil accumulator connected to a propeller governor
to provide unfeathering oil pressure
how is feathering accomplished on a constant speed propeller
releasing the governor oil pressure allows the counterweights and feathering spring to feather the propeller
what are the criteria used by manufacturers to determine the amount of bend damage that can be repaired by cold bending of aluminum propellers
the extent of the bend and the blade station location
what may be used to remove repair file marks from aluminum propellers
very fine sandpaper
what can be used to clean a wooden propeller
warm water and a mild soap together with a brush and cloth
