PROPELLERS PART 1

Why is a constant-speed flyweight 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 hydraulic lock of the piston when the oil cools. To prevent overheating of the engine during the next start.

The centrifugal twisting moment of an operating propeller tends to. increase the pitch angle. reduce the pitch angle. bend the blades in the direction of rotation.

What operational force tends to bend the propeller blades forward at the tip?. Torque-bending force. Centrifugal-twisting force. Thrust-bending force.

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. observing the ammeter or loadmeter for current flow. feeling the boots to see if they are heating.

Surface treatment to counter the effects of dye-penetrant inspection on a propeller is accomplished by. washing off with solvent. wiping with alcohol. rinse the blade in alodine solution.

If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is. the pitch change stops were located incorrectly, causing the cone seats to act as the high pitch stop. the propeller retaining nut was not tight enough during previous operation. the front cone was not fully bottomed against the crankshaft splines during installation.

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 half round or flat file. rough sanding and applying a proper filler.

Manually feathering a hydromechanical propeller means to. block governor oil pressure to the cylinder of the propeller. port governor oil pressure to the cylinder of the propeller. port governor oil pressure from the cylinder of the propeller.

When lubricating a Hartzell propeller blade with grease, to prevent damage to the blade seals, the service manual may recommend on some models to. pump grease into both zerk fittings for the blade simultaneously. remove the seals prior to greasing and reinstall them afterwards. remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting.

In what position is the constant-speed propeller control placed to check the magnetos?. Full decrease, low propeller blade pitch angle. Full increase, high propeller blade pitch angle. Full increase, low propeller blade pitch angle.

Propellers exposed to salt spray should be flushed with. engine oil. fresh water. soapy water.

If a blade of a particular metal propeller is shortened because of damage to the tip, the remaining blade(s) must be. reset (blade angle) to compensate for the shortened blade. returned to the manufacturer for alteration. reduced to conform with the shortened blade.

During the on-speed condition of a propeller, the. centrifugal force acting on the governor flyweights is greater than the tension of the speeder spring. tension on the speeder spring is less than the centrifugal force acting on the governor flyweights. centrifugal force of the governor flyweights is equal to the speeder spring force.

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. maximum allowable engine RPM cannot be exceeded with any combination of manifold pressure, altitude, or forward speed. the limiting engine manifold pressure cannot be exceeded with any combination of throttle opening, altitude, or forward speed.

When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition?. On speed. Underspeed. Overspeed.

Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the. relative wind. chord of the blade. blade face.

An aircraft's propeller system beta range. is used to produce zero or negative thrust. is used to achieve maximum thrust during takeoff. refers to the most fuel efficient pitch range to use at a given engine RPM.

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. prevent metal-to-metal contact between the propeller and the splined shaft. reduce stresses between the splines of the propeller and the splines of the shaft.

How does the aerodynamic twisting force affect operating propeller blades?. It tends to turn the blades to a high blade angle. It tends to bend the blades forward. It tends to turn the blades to a low blade angle.

Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is. a major alteration. a major repair. permitted under the privileges and limitations of a powerplant rating.

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. corrosion. unbalanced aerodynamics. fatigue failure.

What actuates the pilot valve in the governor of a constant-speed propeller?. Engine oil pressure. Governor flyweights. Governor pump oil pressure.

Which of the following generally renders an aluminum alloy propeller unrepairable?. Blade face surface damage. Leading or trailing edge damage. Transverse cracks of any size.

What operational force tends to increase propeller blade angle?. Centrifugal twisting force. Aerodynamic twisting force. Thrust bending force.

Repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following propeller blade areas?. Shank. Face. Back.

Which of the following functions requires the use of a propeller blade station?. Measuring blade angle. Indexing blades. Propeller balancing.

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 and unfeather cycles indicate malfunctions. The feather cycle is correct. The unfeather cycle indicates a malfunction.

How is a propeller controlled in a large aircraft with a turboprop installation?. Independently of the engine. By varying the engine RPM except for feathering and reversing. By the engine power lever.

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 through high pitch to reverse pitch. Low pitch through feather position to reverse pitch.

Which of the following determines oil and grease specifications for lubrication of propellers?. Lubricant manufacturer's instructions. Engine manufacturer's instructions. Propeller manufacturer's instructions.

What operational force causes propeller blade tips to lag in the opposite direction of rotation?. Thrust-bending force. Aerodynamic-twisting force. Torque-bending force.

Which of the following is used to correct horizontal unbalance of a wood propeller?. Brass screws. Shellac. Solder.

What method would be used to inspect an aluminum propeller blade when a crack is suspected?. Use a bright light. Magnetic particle. Dye-penetrant.

Constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without flyweights increase pitch angle using. oil pressure. spring pressure. centrifugal twisting moment.

Which of the following forces or combination of forces operates to move the blades of a constant-speed flyweight propeller to the HIGH PITCH position?. Engine oil pressure acting on the propeller piston-cylinder arrangement and centrifugal force acting on the flyweights. Centrifugal force acting on the flyweights. Prop governor oil pressure acting on the propeller piston-cylinder arrangement.

After proper removal of aluminum blade damage, the affected surface should be polished with. fine steel wool or scotch-brite. very fine sandpaper or crocus cloth. soapstone or wire brush.

How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly?. By slip rings and segment plates. By slip rings and brushes. By flexible electrical connectors.

The propeller blade angle is defined as the acute angle between the airfoil section chord line (at the blade reference station) and which of the following?. The plane of rotation. The relative wind. The axis of blade rotation during pitch change.

What unit in the propeller anti-icing system controls the output of the pump?. Pressure relief valve. Rheostat. Cycling timer.

Propeller fluid anti-icing systems generally use which of the following?. Ethylene glycol. Isopropyl alcohol. Ethyl alcohol.