Propellers Powerplant 12 – Flashcards
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__________ currents move thru the troposphere
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convection
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What is the function of a propeller?
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The propeller blades create thrust to pull or push an airplane through the air.
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How are some wooden propeller blades protected from wear and damage?
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By metal tipping fastened to the leading edge and tip.
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What happens to the blade angle of a constant speed propeller during a constant power dive?
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The blade angle increases to prevent an overspeed.
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What are the functions of a constant speed propeller governor?
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It boosts engine oil pressure before it enters the propeller hub, it senses rotational speed of the propeller, and then adjusts the oil flow to the propeller hub to change pitch and, therefore, speed of the propeller.
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What is the purpose of propeller counterweights?
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Centrifugal force acting on the counterweights causes the blade angle to increase.
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What is meant when a propeller governor is in an "on-speed" condition?
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The governor is not accelerating or decelerating and the speeder spring and flyweight forces are in balance.
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How is a constant speed feathering propeller feathered?
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By releasing oil pressure in the governor, the counterweights and feathering spring move the propeller into feather.
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What is an unfeathering accumulator?
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It is an oil accumulator used to provide oil pressure to unfeather a propeller.
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What systems are commonly used for propeller ice control?
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Fluid (alcohol) and electrical heat applied to the propeller blade root.
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What propeller repairs can be performed by a certified mechanic with a powerplant rating?
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Only minor repairs and alterations can be performed by a certified mechanic with a powerplant rating. Major repairs must be performed by the manufacturer or a certified repair station.
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How are wooden propellers generally cleaned?
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With a brush or cloth and warm water with mild soap.
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Where would you find the correct method and technique for cleaning an aluminum propeller and hub?
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The propeller manufacture's maintenance instructions.
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What type of nondestructive testing should be accomplished to a propeller after blending?
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The procedures recommended by the manufacturer.
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What are the two criteria used by many manufacturers to determine the amount of bend damage that can be repaired by cold bending of aluminum propeller?
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The extent of the bend and its blade station location
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When performing a static balance on a two bladed propeller, what positions must the propeller be placed in when measurements are taken?
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Vertical and horizontal positions.
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What is a propeller protractor used for?
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It is used to measure propeller blade angle.
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What blade conditions can cause engine vibration?
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Vibration can be caused by a propeller being out of track and/or balance, as well as incorrect blade angle setting.
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What is blade tracking?
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Blade tracking is a procedure that compares the position of the propeller blade tips relative to each other.
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What controls both manifold pressure and r.p.m. on an engine equipped with a fixed pitch propeller?
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The throttle.
