PROPELLERS PART 3

Why is the pulley stop screw on a propeller governor adjustable?. To limit the maximum engine speed during takeoff. To maintain the proper blade angle for cruising. To limit the maximum propeller pitch for takeoff.

The primary purpose of a feathering propeller is to. prevent further engine damage when an engine fails in flight. prevent propeller damage when an engine fails in flight. eliminate the drag created by a windmilling propeller when an engine fails in flight.

Where are the high and low pitch stops of a Hamilton Standard constant-speed or two-position flyweight propeller located?. In the hub and blade assembly. In the flyweight assembly. In the dome assembly.

How is anti-icing fluid ejected from the slinger ring on a propeller?. By pump pressure. By centripetal force. By centrifugal force.

Grease used in aircraft propellers reduces the frictional resistance of moving parts and is easily molded into any form under pressure. This statement defines. antifriction and plasticity characteristics of grease. antifriction and chemical stability of grease. viscosity and melting point of grease.

Which of the following defects is cause for rejection of wood propellers?. Dye penetrant inspection failure. Bonding or separation of the trailing edge of the propeller blade. Delamination found by conducting a tap test.

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. The RPM will vary directly with any movement of the throttle. Movement of the throttle will not affect the blade angle.

Which of the following methods is used to straighten a bent aluminum propeller blade that is within repairable limits?. Careful heating to accomplish straightening, followed by heat treatment to restore original strength. Either hot or cold straightening, depending on the location and severity of damage. Never straighten a damaged propeller.

The holding coil on a hydromatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller. governor. dome feathering mechanism. feathering pump motor.

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. low or negative thrust conditions. inefficient propeller pitch angles.

If a flanged propeller shaft has dowel pins. install the propeller so the blades are positioned for hand propping. the propeller can only be installed in a given position. the front cone should be checked for bottoming against the pins.

Propeller blade angle is the angle between the. chord of the blade and the relative wind. relative wind and the rotational plane of the propeller. chord of the blade and the rotational plane of the propeller.

Propeller blade tracking is the process of determining. the plane of rotation of the propeller with respect to the aircraft longitudinal axis. that the blade angles are within the specified tolerance of each other. the positions of the tips of the propeller blades relative to each other.

A constant-speed propeller provides maximum efficiency by. increasing blade pitch as the aircraft speed decreases. adjusting blade angle for most conditions encountered in flight. increasing the lift coefficient of the blade.

Geometric pitch of a propeller is defined as the. effective pitch minus slippage. effective pitch plus slippage. angle between the blade chord and the plane of rotation.

Which of the following statements is true?. A mechanic certificate with a powerplant rating authorizes the holder to repair deep scars, nicks, and dents on aluminum propeller blades. A mechanic certificate with a powerplant rating authorizes the holder to perform minor straightening of steel propeller blades. A mechanic certificate with a powerplant rating does not authorize the holder to perform major repairs on aluminum propeller blades.

When engine power is increased, the constant-speed propeller tries to function so that it will. maintain the RPM, decrease the blade angle, and maintain a low angle of attack. increase the RPM, decrease the blade angle, and maintain a low angle of attack. maintain the RPM, increase the blade angle, and maintain a low angle of attack.

During which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be the greatest?. Approach to landing. Climb following takeoff. High-speed, high-altitude cruising flight.

On twin engine aircraft, the propeller autofeather system is activated when. rudder forces increase beyond a set value during an engine-out condition. a propeller overspeed condition is detected. engine power loss results in a propeller thrust drop to a preset value.

Ice formation on a propeller blade will. produce unbalance and vibration. increase thrust and drag. cause a change in blade angle.

The thrust produced by a rotating propeller is a result of. an area of low pressure behind the propeller blades. an area of decreased pressure immediately in front of the propeller blades. the angle of relative wind and rotational velocity of the propeller.

The blade angle of a fixed-pitch propeller. is greatest at the tip. is smallest at the tip. increases in proportion to the distance each section is from the hub.

The primary purpose of a cuff on a propeller is to. distribute anti-icing fluid. strengthen the propeller. increase the flow of cooling air to the engine nacelle.

How is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full-feathered position?. Pulling out the feathering push button. Electric cutout pressure switch. Stop lugs in the teeth of the rotating cam.

Which of the following best describes the blade movement of a full-feathering, constant-speed propeller that is in the LOW RPM position when the feathering action is begun?. High pitch through low pitch to feather position. High pitch directly to feather position. Low pitch through high pitch to feather position.

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 increase the lateral strength of the blade. To prevent impact damage to the tip and leading edge of the blade. To increase the longitudinal strength of the blade.

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 flight deck propeller control, the propeller blade angle will. increase, engine manifold pressure will increase, and engine RPM will decrease. decrease, engine manifold pressure will increase, and engine RPM will decrease. decrease, engine manifold pressure will decrease, and engine RPM will increase.

One of the advantages of inspecting an aluminum propeller utilizing dye-penetrant inspection procedure is that. defects just below the surface are indicated. it shows whether visible lines and other marks are actually cracks rather than scratches. it indicates overspeed condition.

Propeller blade station numbers increase from. hub center line to tip. tip to hub center line. blade shank butt to tip.

Which of the following statements is true?. During takeoff, propeller thrust (pull) is greatest if the blade angle of attack is low and the engine power setting is high. With the aircraft stationary, propeller thrust is greatest if the blade angle of attack is high and the engine power setting is high. During takeoff, propeller thrust (pull) is greatest if the blade angle of attack is high and the engine power setting is low.

What operational force causes the greatest stress on a propeller?. Aerodynamic twisting force. Centrifugal force. Thrust bending force.

How is the speed of a constant-speed propeller changed in flight?. By varying the output of the governor booster pump. By advancing or retarding the throttle. By changing the load tension against the flyweights in the governor.

Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective. piston gasket. spider-shaft oil seal. dome-barrel oil seal.

The application of more protective coating on one blade than the other when refinishing a wood propeller. has little or no effect on operating characteristics. should never be done. may be necessary to achieve final balancing.

The actual distance a propeller moves forward through the air during one revolution is known as the. effective pitch. geometric pitch. relative pitch.

Flyweights on constant-speed propellers are generally used to aid in. increasing blade angle. decreasing blade angle. unfeathering the propellers.

The centrifugal twisting force acting on a propeller blade is. greater than the aerodynamic twisting force and tends to move the blade to a higher angle. less 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.

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 through the governor to the propeller. permit constant-speed operation of the propeller.

The aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to. reduce the pitch angle. increase the pitch angle. bend the blades rearward in the line of flight.

When preparing a propeller blade for inspection it should be cleaned with. mild soap and water. steel wool. methyl ethyl ketone.