The aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to
increase the pitch angle. increase the pitch angle. increase the pitch angle.
The propeller blade angle is defined as the acute angle between the airfoil section cord line (at the blade reference station) and which of the following? The plane of rotation The plane of rotation.
1. Counterweights on constant-speed propellers are generally used to aid in increasing blade angle. increasing blade angle.
What is the primary purpose of the metal tipping which covers the blade tips and extends along the leading edge of each wood propeller blade?
To prevent impact damage to the tip and leading edge of the blade. To prevent impact damage to the tip and leading edge of the blade. To prevent impact damage to the tip and leading edge of the blade.
1. The actual distance a propeller moves forward through the air during one revolution is known as the
effective pitch. effective pitch. effective pitch.
1. How is anti-icing fluid ejected from the slinger ring on a propeller? By centrifugal force. By centrifugal force.
1. What operational force causes propeller blade tips to lag in the opposite direction of rotation? Torque-bending force. Torque-bending force.
Propeller blade stations are measured from the hub centerline. hub centerline.
1. When preparing a propeller blade for inspection it should be cleaned with
mild soap and water mild soap and water.
Why is a constant-speed couterweight propeller normally placed in full HIGH PITCH position before the engine is stopped? To prevent exposure and corrosion of the pitch changing mechanism. To prevent exposure and corrosion of the pitch changing mechanism.
What normally prevents a Hartzell Compact propeller from going to feather when the engine is shut down on the ground? A latch mechanism composed of springs and lick pins. A latch mechanism composed of springs and lick pins.
What type of imbalance will cause a two blade propeller to have a persistent tendency to come to rest in a horizontal position (with the blades parallel to the ground) in a horizontal position (with the blades parallel to the ground).
while being checked on a propeller balancing beam?
Vertical. Vertical. Vertical.
1. What actuates the pilot valve in the governor of a constant speed propeller? Governor flyweights.
Governor flyweights.
.
For takeoff, a constant speed propeller is normally set in the LOW PITCH, high RPM position LOW PITCH, high RPM position.
Geometric pitch of a propeller is defined as the effective pitch plus slippage. effective pitch plus slippage.
A propeller synchrophasing system allows a pilot to reduce noise and vibration by adjusting the phase angle between the propellers on an aircraft's engines. adjusting the phase angle between the propellers on an aircraft's engines.
Generally, unless otherwise specified by the manufacturer, repairs or nicks, scratches, gouges, etc. on aluminum propeller blades must be made parallel to the length of the blade. parallel to the length of the blade.
Which of the following best describes the blade movement of a feathering propeller that is in the HIGH RPM position when the feathering action is begun?
Low pitch through high pitch to feather position.
Low pitch through high pitch to feather position.
.
Propellers exposed to salt spray should be flushed with
fresh water
fresh water
.
Inspection of propeller blades by dye penetrate inspection is accomplished to detect
cracks or other defects. cracks or other defects. cracks or other defects.
Which of the following forces or combination of forces operates to move the blades of a constant speed counterweight type propeller to the HIGH PITCH position? Centrifugal force acting on the counterweights.
Centrifugal force acting on the counterweights.
.
The primary purpose of a cuff on a propeller is to
increase the flow of cooling air to the engine nacelle.
increase the flow of cooling air to the engine nacelle.
.
Most engine propeller combinations have one or more critical ranges within which continuous operation is not permitted.
Critical ranges are established to avoid
severe propeller vibration. Critical ranges are established to avoid
severe propeller vibration.
On aircraft equipped with hydraulically operated constant speed propellers, all ignition and magneto checking is done with the propeller in which position?
high RPM high RPM.
In what position is the constant speed propeller control placed to check the magnetos? Full increase, low propeller blade pitch angle. Full increase, low propeller blade pitch angle.
Which of the following generally renders an aluminum alloy propeller unrepairable? Transverse cracks of any size. Transverse cracks of any size.
A powerplant using a hydraulically controlled constant speed propeller is operating within the propeller's constant speed range at a fixed throttle setting. If the tension of the propeller governor control spring (speeder spring) is reduced by movement of the cockpit propeller control, the propeller blade angle will
increase, engine manifold pressure will increase, and engine RPM will decrease. increase, engine manifold pressure will increase, and engine RPM will decrease.
During operational check of an aircraft using hydromatic full feathering propellers, the following observations are made: The feather button, after being pushed, remains depressed until the feather cycle is complete, then opens. When unfeathering, it is necessary to manually hold the button down until unfeathering is accomplished.
Both feather cycle and unfeather cycle are functioning properly.
Both feather cycle and unfeather cycle are functioning properly.
.
The purpose of a three way propeller valve is to
direct oil from the engine oil system to the propeller cylinder. direct oil from the engine oil system to the propeller cylinder.
When engine power is increased, the constant speed propeller tries to function so that it will maintain the RPM, increase the blade angle, and maintain a low angle of attack. maintain the RPM, increase the blade angle, and maintain a low angle of attack.
The angle of attack of a rotating propeller blade is measured between the blade chord or face and which of the following?
Relative airstream Relative airstream.
What method would be used to inspect an aluminum propeller blade when a crack is suspected?
Dye penetrate Dye penetrate.
Which of the following best describes the blade movement of a propeller that is in the high RPM position when reversing action is begun? Low pitch directly to reverse pitch. Low pitch directly to reverse pitch.
Maximum taper contact between crankshaft and propeller hub is determined by using
bearing blue color transfer. bearing blue color transfer.
The application of more protective coating on one blade than the other when refinishing a wood propeller
may be necessary to achieve final balancing.
may be necessary to achieve final balancing.
.
A constant speed propeller provides maximum efficiency by
adjusting blade angle for most conditions encountered in flight. adjusting blade angle for most conditions encountered in flight.
(1) During takeoff, propeller thrust (pull) is greatest if the blade angle of attack is low and the engine power setting is high.
(2) With the aircraft stationary, propeller thrust is greatest if the blade angle of attack is high and the engine power setting is high. Regarding the above statements,
only No. 1 is true. only No. 1 is true.
How is the speed of a constant speed propeller changed in flight? By changing the load tension against the flyweights in the governor. By changing the load tension against the flyweights in the governor.
The low pitch stop on a constant speed propeller is usually set so that
The engine will turn at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure. The engine will turn at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure.
What is indicated when the front cone bottoms while installing a propeller?
Rear cone should be moved forward
Rear cone should be moved forward
.
Which of the following is used to correct horizontal unbalance of a wood propeller?
solder solder.
Constant speed non feathering McCauley, Hartzell, and other propellers of similar design without counterweights increase pitch angle using
oil pressure
oil pressure
.
Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be greater at high RPM greater at high RPM.
A fixed pitch wooden propeller that has been properly installed and the attachment bolts properly torqued exceeds the out of track allowance by 1/16 inch. The excessive out of track condition may be corrected by placing shims between the inner flange and the propeller.
placing shims between the inner flange and the propeller.
.
An aircraft's propeller system beta range
is used to produce zero or negative thrust.
is used to produce zero or negative thrust.
is used to produce zero or negative thrust.
.
Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the
chord of the blade. chord of the blade.
Minor surface damage located in a repairable area, but not on the leading or trailing edges of aluminum blades, may be repaired by first filing with a riffle file.
filing with a riffle file.
.
What unit in the propeller anti icing system controls the output of the pump? Rheostat. Rheostat.
What is the result of moving the throttle on a reciprocating engine when the propeller is in the constant speed range with the engine developing cruise power?
Opening the throttle will cause an increase in blade angle. Opening the throttle will cause an increase in blade angle.
Manually feathering a hydromechanical propeller means to port governor oil pressure from the cylinder of the propeller. port governor oil pressure from the cylinder of the propeller.
What will happen to the propeller blade angle and the engine RPM if the tension on the propeller governor control spring (speeder spring) is increased? Blade angle will decrease and RPM will increase
Blade angle will decrease and RPM will increase
.
During which of the following conditions of flight will the blade pitch angle of a constant speed propeller be the greatest? High speed, high altitude cruising flight. High speed, high altitude cruising flight.
When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition?
Overspeed
Overspeed
.
Ice formation on propellers, when an aircraft is in flight, will decrease thrust and cause excessive vibration.
decrease thrust and cause excessive vibration.
.
Which of the following functions requires the use of a propeller blade station? Measuring blade angle.
Measuring blade angle.
.
What are the rotational speed and blade pitch angle requirements of a constant speed propeller during takeoff?
High speed and low pitch angle High speed and low pitch angle.
During the on speed condition of a propeller, the
centrifugal force of the governor flyweights is equal to the speeder spring force. centrifugal force of the governor flyweights is equal to the speeder spring force.
The primary purpose of a propeller is to change engine horsepower to thrust
change engine horsepower to thrust
.
The pitch changing mechanism of the hydromatic propeller is lubricated by the pitch changing oil. the pitch changing oil.
What is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades? To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping). To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping).
One of the advantages of inspecting an aluminum propeller utilizing dye penetrate inspection procedure is that it shows whether visible lines and other marks are actually cracks rather than scratches. it shows whether visible lines and other marks are actually cracks rather than scratches.
On most reciprocating multiengine aircraft, automatic propeller synchronization is accomplished through the actuation of the propeller governors.
propeller governors.
.
How is a propeller controlled in a large aircraft with a turboprop installation? By the engine power lever.
By the engine power lever.
.
The centrifugal twisting moment of an operating propeller tends to
reduce the pitch angle. reduce the pitch angle.
How does the propeller overspeed governor on a turboprop engine decrease propeller RPM? By allowing oil to escape from the propeller hub thus driving the blades to a increased blade angle. By allowing oil to escape from the propeller hub thus driving the blades to a increased blade angle.
How can a steel propeller hub be tested for cracks? By magnetic particle inspection.
By magnetic particle inspection.
.
How does the aerodynamic twisting force affect operating propeller blades? It tends to turn the blades to a high blade angle. It tends to turn the blades to a high blade angle.
Where are the high and low pitch stops of a Hamilton Standard constant speed or two position counterweight propeller located? In the counterweight assembly.
In the counterweight assembly.
.
After proper removal of aluminum blade damage, the affected surface should be polished with very fine sandpaper.
very fine sandpaper.
.
If a blade of a particular metal propeller is shortened because of damage to the tip, the remaining blade(s) must be reduced to conform with the shortened blade.
reduced to conform with the shortened blade.
.
If a flanged propeller shaft has dowel pins the propeller can be installed in only one position.
the propeller can be installed in only one position.
.
The primary reason for careful inspection and prompt repairing of minor surface defects such as scratches, nicks, gouges, etc. on aluminum alloy propellers is to prevent
fatigue failure.
fatigue failure.
.
Which of the following statements about constant speed counterweight propellers is also true when referring to two position counterweight propellers? Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal. Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal.
Which of the following occurs to cause front cone bottoming during propeller installation? The front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened against the cone seats in the propeller hub.
The front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened against the cone seats in the propeller hub.
.
When lubricating a Hartzell propeller blade with grease, to prevent damage to the blade seals, the service manual may recommend on some models to remove one of the two Zerk fittings for the blade and grease the blade through the remaining fitting. remove one of the two Zerk fittings for the blade and grease the blade through the remaining fitting.
Propeller blade angle is the angle between the chord of the blade and the rotational plane of the propeller.
chord of the blade and the rotational plane of the propeller.
.
Surface treatment to counter the effects of dye penetrate inspection on a propeller is accomplished by
washing off with solvent.
washing off with solvent.
.
It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to
eliminate stress concentration points.
eliminate stress concentration points.
.
Grease used in aircraft propellers reduces the fractional resistance of moving parts and is easily molded into any form under pressure. This statement defines antifriction and plasticity characteristics of grease.
antifriction and plasticity characteristics of grease.
.
What operational force tends to increase propeller blade angle? Aerodynamic twisting force. Aerodynamic twisting force.
Propeller aerodynamic (thrust) imbalance can be largely eliminated by correct blade contouring and angle setting.
correct blade contouring and angle setting.
.
The purpose of permanently sealing and partially filling some models of McCauley propeller hubs with dyed oil is to
make the location of cracks readily apparent.
make the location of cracks readily apparent.
.
Why is the pulley stop screw on a propeller governor adjustable? To limit the maximum engine speed during takeoff.
To limit the maximum engine speed during takeoff.
.
Propeller fluid anti icing systems generally use which of the following?
Isopropyl alcohol.
Isopropyl alcohol.
.
The centrifugal twisting force acting on a propeller blade is greater than the aerodynamic twisting force and tends to move the blade to a lower angle.
greater than the aerodynamic twisting force and tends to move the blade to a lower angle.
.
Cold straightening a bent aluminum propeller blade may be accomplished by an appropriately rated repair station or the manufacturer.
an appropriately rated repair station or the manufacturer.
.
Propeller blade tracking is the process of determining
the positions of the tips of the propeller blades relative to each other. the positions of the tips of the propeller blades relative to each other.
(1) A mechanic certificate with a powerplant rating authorizes the holder to repair deep scars, nicks, and dents on aluminum propeller blades.
(2) A mechanic certificate with a powerplant rating authorizes the holder to perform minor straightening of steel propeller blades.
neither No. 1 nor No. 2 is true.
neither No. 1 nor No. 2 is true.
.
Which of the following best describes the blade movement of full feathering constant speed propeller that is in the LOW RPM position when the feathering action is begun?
High pitch directly to feather position.
High pitch directly to feather position.
.
What is the purpose of an arbor used in balancing a propeller?
To support the propeller on the balance knives.
To support the propeller on the balance knives.
.
Longitudinal (fore and aft) clearance of constant speed propeller blades or cuffs must be at least 1/2 inch (12.7 mm) between propeller parts and stationary parts of the aircraft. This clearance is with the propeller blades feathered or in the most critical pitch configuration.
feathered or in the most critical pitch configuration.
.
Which of the following is identified as the cambered or curved side of a propeller blade, corresponding to the upper surface of a wing airfoil section?
Blade back
Blade back
.
The thrust produced by a rotating propeller is a result of an area of decreased pressure immediately in front of the propeller blades. an area of decreased pressure immediately in front of the propeller blades.
The primary purpose of the front and rear cones for propellers that are installed on splined shafts is to
position the propeller hub on the splined shaft.
position the propeller hub on the splined shaft.
.
Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective spider shaft oil seal.
spider shaft oil seal.
.
What operational force causes the greatest stress on a propeller? Centrifugal force.
Centrifugal force.
.
When running up an engine and testing a newly installed hydromatic propeller by moving the governor control through its entire travel several times to free the dome of any entrapped air.
free the dome of any entrapped air.
.
Which of the following defects is cause for rejection of wood propellers?
An oversize hub or bolthole, or elongated boltholes.
During engine operation at speeds lower than those for which the constant speed propeller control can govern in the INCREASE RPM position, the propeller will
remain in the full LOW PITCH position.
remain in the full LOW PITCH position.
.
What controls the constant speed range of a constant speed propeller? The mechanical limits in the propeller pitch range.
The mechanical limits in the propeller pitch range.
.
Propeller blade station numbers increase from hub center line to tip
hub center line to tip
.
Repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following propeller blade areas? Shank Shank.
What action takes place when the cockpit control lever for a hydromatic, constant speed propeller is actuated? Compression of the speeder spring is changed.
Compression of the speeder spring is changed.
.
If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is the propeller retaining nut was not tight enough during previous operation.
the propeller retaining nut was not tight enough during previous operation.
.
What operational force tends to bend the propeller blades forward at the tip? Thrust bending force. Thrust bending force.
The blade angle of a fixed pitch propeller is smallest at the tip
is smallest at the tip
.
Which of the following methods is used to straighten a bent aluminum propeller blade that is within repairable limits?
Cold straightening only.
Cold straightening only.
.
What is a function of the automatic propeller synchronizing system on multiengine aircraft? To control engine RPM and reduce vibration. To control engine RPM and reduce vibration.
Which of the following determines oil and grease specifications for lubrication of propellers? Propeller manufacturers.
Propeller manufacturers.
.
Proper operation of electric deicing boots on individual propeller blades may best be determined by feeling the sequence of boot heating and have an assistant observe the loadmeter indications.
feeling the sequence of boot heating and have an assistant observe the loadmeter indications.
.
The holding coil on a hydromatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller feathering pump motor.
feathering pump motor.
.
The primary purpose of a feathering propeller is to eliminate the drag created by a windmilling propeller when an engine fails in flight.
eliminate the drag created by a windmilling propeller when an engine fails in flight.
.
How is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full feathered position? Electric cutout pressure switch. Electric cutout pressure switch.
Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is
a major repair.
a major repair.
.
Which of the following statements concerning the installation of a new fixed pitch wood propeller is true? Inspect the bolts for tightness after the first flight and again after the first 25 hours of flying.
Inspect the bolts for tightness after the first flight and again after the first 25 hours of flying.
.
How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly?
By slip rings and brushes. By slip rings and brushes.
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