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40 Cards in this Set
- Front
- Back
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What type of device is used on propeller blades to remove ice that has formed on them? |
Electrically heated deicer boots.
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What is used to prevent ice forming on a propeller blade?
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A mixture of ethylene glycol and isopropyl alcohol slung out along the blades.
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Should an adjustable–pitch propeller be in high pitch or in low pitch for takeoff?
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In low pitch.
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What is done to cause a Hydromatic propeller to feather?
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High–pressure engine oil is directed into the propeller through the governor.
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What is done to cause a McCauley propeller to feather?
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Oil is allowed to drain out of the propeller.
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Does centrifugal twisting moment on a propeller blade tend to move the blades toward high pitch or toward low pitch?
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Toward low pitch.
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Do the counterweights on a propeller tend to move the blades toward high pitch or toward low pitch?
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Toward high pitch.
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What is the difference between a controllable propeller and a constant–speed propeller?
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Basically, it is the control system. A controllable–pitch propeller uses a manually operated oil valve to control the pitch, and a constant–speed propeller uses a governor to control the valve.
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When making a magneto check on an engine equipped with a constant–speed propeller, should the propeller control be in the low–pitch or the high–pitch position?
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It should be in the low–pitch position.
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What can be done to prevent the front cone from bottoming when installing a propeller on a splined shaft?
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Install a spacer behind the rear cone to move the propeller forward on the shaft.
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What is the purpose of the small holes that are drilled in the end of a wooden propeller?
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These holes vent the inside of the propeller blade and allow moisture that collects in the wood to be released.
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What is the function of the snap ring inside the hub of a propeller that is mounted on a tapered or splined shaft?
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The snap ring allows the propeller to be pulled off of the shaft when the retaining nut is backed off.
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What is adjusted inside the governor for a constant–speed propeller to change the speed at which the propeller is operating?
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The compression of the speeder spring.
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What is the function of the accumulator that is used with some McCauley feathering propellers?
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The accumulator stores oil under pressure when the engine is operating normally. This oil is used to help the propeller blades move toward low pitch when the propeller is being unfeathered.
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What is meant by the beta range of operation of a turboprop propeller?
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This is the mode of ground operation, and it includes starting, taxiing, and ground reverse operation.
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What is meant by the alpha range of operation of a turboprop propeller?
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This is the in–flight mode of operation from takeoff to landing.
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Is the flat surface of a propeller blade the face of the blade or the back of the blade?
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It is the face of the blade.
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What keeps a McCauley feathering propeller from feathering when the engine is shutdown on the ground?
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A spring–loaded latch mechanism prevents the blades moving into the feather position when the engine is shut down on the ground. In the air, aerodynamic forces keep the propeller rotating, and centrifugal force holds the blades unlatched so they can move to the feather position when oil pressure is taken out of the propeller.
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What is meant by a slave engine with regard to prop synchronization?
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This is the engine in a multi–engine airplane whose RPMs follow those set on the master engine
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What does the pilot do to change the RPM of an engine equipped with a constant–speed prop when it is operating within the constant–speed range?
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Moves the prop pitch control that changes the compression on the speeder spring inside the governor which moves the pilot valve. The pilot valve directs oil into or out of the prop to change the pitch of the blades. The change in pitch changes the air load on the prop which changes the RPM
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How can you determine that the electrically heated deicer boots on the prop blades are working as they should?
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Observe the loadmeter or ammeter to see if the proper current is flowing, and follow the sequence of boot heating by feeling with your hands to see which one is heating. The boots should all have similar heat rise in the same length of time
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How are props on a twin–engine synchronized?
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Prop governor of the master engine is set to the desired RPM. A signal from the master engine governor is sent to the control box which sends a signal to a stepping motor. This motor adjust the prop governor and fuel control of the slave engine causing it to maintain exactly the same RPM as the master engine
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Where do you find a list of the lubricants that are approved for use in a constant–speed prop?
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Maintenance manual for the prop
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Who or what facility is authorized to perform major repairs to a prop?
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An FAA approved prop repair station that is authorized for the specific prop
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What checks and maintenance is a mechanic with a powerplant rating allowed to make on a prop?
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Check the track
Remove small nicks and scratches Check dynamic balance Lube |
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What adjustment can a mechanic with a powerplant rating make to a prop governor?
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Adjust the maximum RPM stop
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Why do some aircraft engines have a critical range of operation?
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Engine/prop have a resonant frequency problem in which excessive vibration can occur in a certain range of RPM. The tach is marked in red for this limitation. When it is necessary to pass through this range it must be done as quickly as practical
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What can be done to prevent the front cone from bottoming when installing a prop on a splined shaft?
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Install a spacer behind the rear cone to move the prop forward on the shaft
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Why is a prop indexed to the engine crankshaft?
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Relationship between the prop and the crankshaft is chosen to produce the minimum vibration
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What instrument is used to measure the blade angle of a prop?
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Universal propeller protractor
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Where is the propeller protractor placed to measure the prop blade angle?
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At a distance from the center of the prop hub. This distance is specified in the prop maintenance manual in blade stations
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What is the extent of the repairs a mechanic with a powerplant rating can make to a prop?
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Only minor repairs or minor alterations
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Where can examples of acceptable repairs to aluminum alloy prop blades be found?
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AC 43. 13–1B chapter 8 section 4
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Is it permissible to cold straighten a damaged aluminum alloy prop blade to facilitate shipping it to a repair station?
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No, this could cause hidden damage that may render the blade nonrepairable
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What would be the classification of maintenance for shortening a prop blade?
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Major repair
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May transverse cracks in a metal prop blade be repaired?
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No, transverse crack of any size is reason for rejecting the blade
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What damage to an aluminum alloy prop blade can be repaired by a powerplant mechanic?
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Small roughness, nicks, and scratches in the leading edge of the blades
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How are small nicks removed from the leading edge of a prop blade?
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File them out with a file or stone, leaving a smooth contour
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Who is allowed to reduce the diameter of a type certificated prop?
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FAA–certificated prop repair station with approval for the particular prop
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How can you determine that a surface scratch in an aluminum alloy prop blade is not actually a crack?
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Clean the damage out to a saucer–shaped depression an spray the area with a dyepenetrant liquid. Allow it time to seep into a crack if one is present, then wipe all of the liquid off. Spray with developer. If the damage is actually a crack the developer will pull the penetrant out and it will form a visible line |
