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aviation
ch. 12 propellers oral questions
22
Aviation
Undergraduate 1
02/09/2014

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Term
what is the function of a propeller
Definition
creates thrust to pull or push an airplane through the air
Term
what is the difference between a fixed pitch propeller and a controllable pitch propeller
Definition
fixed pitch- has a built in blade angle that can not be changed by pilot
controllable- can be changed by pilot
Term
how are some wooden blades protected from wear and damage
Definition
metal tipping fastened to the leading edge and tip
Term
what happens to the blade angle of a constant speed propeller during a constant power dive
Definition
the blade angle increases to prevent an overspeed
Term
what are the functions of a constant speed propeller governor
Definition
boosts engine oil pressure before it enters the propeller hub,
senses rotational speed of the propeller,
and adjusts the oil flow to the propeller hub to change pitch and speed of propeller
Term
what is the purpose of propeller counterweights
Definition
causes the blade angle to increase with centrifugal force
Term
what is meant when a propeller governor is in an "on-speed" condition
Definition
the governor is not accelerating or decelerating and the speeder spring and flyweight forces are in balance
Term
how is a constant speed feathering propeller feathered
Definition
controlled by the pilot by moving the propeller control into the feathering detent
Term
what is an un-feathering accumulator
Definition
it is an oil accumulator used to provide oil pressure to un-feather a propeller
Term
what is "alpha range" and "beta range" and where are they found
Definition
they pertain to the operating modes of turboprop reversible-pitch props.
alpha- operates in the standard, constant speed mode
beta- operates in zero or min. thrust range and reverse thrust mode
Term
what systems are commonly used for propeller ice control
Definition
alcohol and electrical heat applied to the propeller blade root
Term
what propeller repairs can be performed by a certified mechanic w/powerplant rating
Definition
only minor repairs and alterations
Term
how are wooden prop generally cleaned
Definition
brush or cloth and warm water with mild soap
Term
where would you find the correct method and technique for cleaning an aluminum prop. and hub
Definition
propeller manufacturer's maintenance instructions
Term
what type of nondestructive testing should be accomplished to a propeller after blending
Definition
procedures recommended by the manufacturer
Term
what are the 2 criteria used by many manufacturers to determine the amount of bend damage that can be repaired by cold bending of aluminum propellers
Definition
the extent of the blade and its blade station location
Term
how can repair file marks be removed from an aluminum propeller
Definition
with very fine sandpaper
Term
when performing a static balance on a 2 bladed propeller, what positions must the propeller be place in when measurements are taken
Definition
vertical and horizontal positions
Term
what is a propeller protractor used for
Definition
it is used to measure propeller blade angle
Term
what blade conditions can cause engine vibration
Definition
can be caused by a propeller being out of track and/or balance, as well as incorrect blade angle setting
Term
what is blade tracking
Definition
procedure that compares the position of the propeller blade tips relative to each other
Term
what controls both manifold pressure and r.p.m. on an engine equipped with a fixed pitch propeller
Definition
the throttle
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