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AMT1222
Aircraft Propellers
| Question | Answer |
|---|---|
| What operational force causes the greatest stress on a propeller? | Centrifugal |
| What operational force tends to increase propeller blade angle? | Aerodynamic twisting force |
| The acute angle between the airfoil section chord line (at the blade reference station) and the plane of rotation is known as what? | The propeller blade angle |
| The actual distance the propeller moves forward through the air is known as what? | Effective pitch |
| Where are propeller blade stations measured from? | Hub centerline |
| The thrust produced by a rotating propeller is a result of: | an area of decreased pressure immediately forward of the propeller blades |
| What is the curved side of a propeller blade known as? | Blade back |
| Any critical operating ranges to avoid prop vibration would be indicated how? | A red arc on the tachometer |
| What is the primary purpose of a cuff on a propeller? | to increase the flow of cooling air to the engine nacelle |
| Decreasing the oil pressure in the governor accomplishes what goal? | Feathering of the prop |
| What components comprise a typical anti-icing system? | a supply tank, pump, stationary nozzle, and a " slinger ring" |
| How is anti-icing fluid ejected from the slinger ring on a propeller? | Centrifugal force |
| What does the propeller governor control? | Oil to and from the pitch changing mechanism |
| Two-position counterweight or Hamilton Standard constant-speed propellers have the high and low pitch stops located where? | In the counterweight assembly |
| What is the purpose of permanently sealing and partially filling some models of McCauley propeller hubs with dyed oil? | make the location of crack readily apparent |
| What force helps to eject anti-icing fluid on a propeller? | Centrifugal |
| Lubrication specifications such as grease and oil are determined by: | Propeller manufacturer |
| On a constant-speed propeller, increasing the blade angle is aided by: | the counterweights |
| What inspection method would be used to determine if a visible line is a crack? | Dye penetrate |
| What is propeller blade tracking? | The process used to determine where the blade tips are in reference to each other |
| Centrifugal force acting on the propeller blade counterweights increase blade pitch and governs oil pressure for low pitch on what type propeller blade hub? | Hartzell aluminum and steel hub models |
| How would the pilot increase blade angle and manifold pressure while decreasing engine RPM when flying with a constant-speed propeller? | Reduce the speeder spring tension by moving the control in the cockpit |
| How do you counter the effects of dye-penetrant? | wash with solvent |
| When is the centrifugal force acting on the governor flyweights equal to the speeder spring tension? | During the on-speed condition of the propeller |
| When does the centrifugal force acting on the governor flyweights overcome the speeder spring tension? | During overspeed condition |
| Limiting the maximum engine speed during takeoff is done how? | the pulley stop screw on a propeller governor |
| Propeller synchronization is accomplished how? | Propeller governors |
| What is the purpose of the metal tipping that extends along the leading edge of the propeller blade? | Prevent impact damage |
| What position should the propeller be in during all ignition and magneto checking for aircraft with hydraulically operated constant speed propellers? | High RPM |
| From hub to tip is how what are measured? | Blade station numbers |
| Repair of deep scars, nicks, and dents are considered to be a major repair and may only be performed by who? | A properly certified repair station or the propeller manufacturer |
| What fluid is generally used in anti-icing systems? | Isopropyl alcohol |
| A function of the automatic propeller synchronizing system on multiengine aircraft is: | to control engine RPM and reduce vibration |
| Slip rings and brushes are used to transfer what? | aircraft electrical power to propeller hub assembly for deicing |
| A universal propeller protractor is used to measure what? | Blade angles |
| How much fore and aft (longitudinal) clearance is required between the blade cuffs and any stationary parts of the aircraft? | 1/2 inch minimum |
| To achieve final balancing of a wooden propeller, what is sometimes done? | The application of more protective coating on one blade than the other |
| Magnetic particle inspection can be used to test for cracks in what? | steel propeller hub |
| Cold straightening of a bent aluminum propeller blade can only be done by: | repair station or manufacturer |
| What visual indication would reveal a defective spider shaft oil seal when a hydromatic propeller is used? | oil leaking around the rear cone |
| Aerodynamic twisting force does what to the blade angle? | Increase |
| What controls the oil to and from the pitch changing mechanism? | Propeller governor |
| What position is a constant speed counterweight propeller placed in to prevent exposure and corrosion of the pitch change mechanism? | Full high pitch |
| Adjusting the phase angle between the propellers on an aircraft does what? | reduces noise and vibration |
| The antifriction and plasticity of grease can be defined how? | reduces friction and easily molds under pressure |
| When the control lever for a hydromatic constant-speed propeller is actuated, what happens? | the speeder spring compression is changed |
| How should you lubricate a hartzell propeller? | remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting |
| With an increase in engine power, a constant-speed propeller tries to: | maintain rpm, increase blade angle, and maintain low angle of attack |
| Proper operation of electrical deicing boots can be determined how? | feel the boot for heating and have an assistant observe the load meter |
| The curved surface of the blade is what? | blade back |
Created by:
Ms.Fietzek
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