Propellers Flashcards
How is aircraft electrical power for propeller de-icer systems transferred from the engine to propeller hub assembly?
Brushes & Slip Rings
How is anti-icing fluid ejected from the slinger ring on a propeller?
Centrifugal Force
Propeller fluid anti-icing systems generally use what?
Isopropyl Alcohol
Ice formation on propellers, when an aircraft is in flight, will cause what?
Decrease in Thrust & Excessive Vibration
What unit (component) in the propeller anti-icing system controls the output of the pump?
Rheostat
A propeller synchrophasing system allows a pilot to reduce noise and vibration by
Adjusting the phase angle between the propellers on aircraft engine
What determines oil and grease specifications for lubrication of propellers?
Propeller’s Manufacture
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) while being checked on a propeller balancing beam?
Vertical Imbalance
What is the purpose of an ARBOR used in balancing a propeller?
Supports the propeller on the balancing Knives
The application of more protective coating on one blade than the other when refinishing a wood propeller is to…
Achieve final balancing by applying protective coatings to the light blade
Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be
Greater at Higher RPM
Which of the following is used to correct horizontal unbalance of a wood propeller?
Add or Remove Solder from the Blade Tip
During the on-speed condition of a propeller, the position of the flyweights
is equal to the speeder spring force
What actuates the pilot valve in the governor of a constant-speed propeller?
Governor Flyweights
When the centrifugal force acting on the propeller governor flyweight overcomes the tension on the speeder spring, a propeller is in what speed condition?
Overspeed
What operational force tends to increase propeller blade angle?
Aerodynamic Twisting Force
Which function requires the use of a propeller blade station?
Measure of Blade Angles
During which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be greatest?
High Speed, High Altitude Cruising Flight
The actual distance a propeller moves forward through the air during one revolution is known as the
Effective Pitch
The pitch-changing mechanism of the hydromatic propeller is lubricated by
Pitch Changing Oil
The thrust produced by a rotating propeller is a result of
Area of decreased pressure immediately in front of propeller blade
The holding coil on a hydromatic propeller feathering button switch holds a solenoid relay closed that applies power to the what?
Propeller feathering pump motor
Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the
Chord of the blade at a specified station
Propeller blade station numbers increase from
Hub Center to Centerline of Tip
What best describes the blade movement of a feathering propeller that is in the HIGH RPM position when the feathering action is begun?
Low Pitch, High Pitch, Feather Position
Where are the high and low pitch stops of a Hamilton Standard constant-speed or two-position counterweight propeller located?
Counterweight Assemblies
The primary purpose of a cuff on a propeller is to
Increase the flow of cool air to the engine nacelle
The purpose of a three-way propeller valve is to
Directs oil from the engine oil system to propeller cylinder
Geometric pitch of a propeller is defined as the
Effective Pitch + Slippage
Propeller blade angle is the angle between the
horizontal plane of rotation of the rotor disc and the chord line of the airfoil
What operational force causes the propeller blade tips to lag in the opposite direction of rotation?
Torque Bending
What operational force tends to bend the propeller blades forward at the tip?
Thrust Bending
What are the rotational speed and blade pitch angle requirements of a constant-speed propeller during takeoff?
Low Blade Angle, High RPM
Constant-speed non-feathering McCauley, Hartzell, and other propeller of similar design without counterweight increase pitch angle using
Oil Pressure
Counterweights on constant-speed propellers are generally used to aid in
Increasing blade angle
The primary purpose of a feathering propeller is to
Eliminate the drag created by a windmilling propeller when an engine fails in flight
How do you correct front cone bottoming?
Place a thick steel spacer (shim) behind the rear cone.
What is the basic purpose of the three small holes (No.60 drill) in the tipping of wood propeller blades?
To allow moisture between the tipping & the wood to escape
Repairs of aluminum alloy adjustable pitch propeller are not permitted to be made on what propeller blade area?
Blade Shanks
It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to
Eliminate Stress on concentration points
Generally, unless otherwise specified by the manufacturer, repairs of nicks, scratches, gouges, etc. on aluminum propeller blades must be made
Parallel to the length of the blade
When preparing a propeller blade for inspection it should be cleaned with
Mild Soap & Water
What method would be used to inspect an aluminum propeller blade when a crack is suspected?
Dye Penetrant
Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is considered to be…
A Major Repair
What defect generally renders an aluminum alloy propeller unrepairable?
Traverse cracks of any size will render a propeller unrepairable
Centrifugal Force is
A physical force that pulls the blades outward from the hub
The smallest increment you can measure with a propeller protractor?
Tenth of a degree
When engine power is increased, the constant-speed propeller tries to function so that it will…
increase blade angle in order to maintain constant RPM & maintain low angle of attack & increase airspeed
What normally prevents Hartzell Compact propeller from going to feather when an engine is shut down on the ground
high pitch stops & spring loaded latches
To increase power without damaging a reciprocating engine, which control should be advanced first?
Propeller Pitch Control forward, then throttle
