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.
The powerplant with the greater propulsive efficiency is the turbofan turboprop.
The propeller on a TPE331 engine is unfeathered with oil pressure produced by a/an __________ -driven unfeathering pump. counterweights electric motor windmilling.
The primary purpose of a cuff on a propeller is to distribute anti-icing fluid. increase the flow of cooling air to the engine nacelle. strengthen the propeller.
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.
Generally, unless otherwise specified by the manufacturer, repairs of nicks,scratches, gouges, etc. on aluminum propeller blades must be made parallel to the lenght of the blade. so as return the damaged area to the original dimensions. perpendicular to the blade axis.
Minor surface damage located in a repairable area, but not on the leading or trailing edges of aluminum blades, may be repaired by first filling with a riffle file. rough sanding and applying a proper filler. filling with a half round or flat file.
A PT6 engine is normally started with the propeller in the __________ position. reverse-pitch low-pitch feather.
The portion of a propeller blade that must be most carefully inspected is the _________________ edge. leading trailing.
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.
Three types of propeller shafts used on aircraft engines are:
1. flanged
2. splined
3. free
4. centrifugal
5. tapered two, three and four. three, four and five. one, two and five.
The pickups that determine whether or not the two engines are in synchronization are in the propeller governors. spinner. propeller shaft.
Which of the following statements concerning the installation of a new fixed-pitch wood propeller is true? If a separate metal hub is used, final track should be accomplished prior to installing the hub in the propeller. NAS close-tolerance bolts should be used to install the propeller. Inspect the bolts for tightness after the first flight and again after the first 25 hours of flying.
What type of imabalance 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 balancin beam? Vertical. Horizontal Harmonic.
If there are no other specifications, the maximum amount the blades of a fixed pitch metal propeller are allowed to be out of track are ___? 1/4 1/16.
Which of the following generally renders an aluminum alloy propeller unrepairable? Transverse cracks of any size. Any slag inclusions or cold shuts. Any repairs that would require shortening and recontouring of blades.
Two basic types of turboprop engines are:
a.
b. a. Single-shaft
b. Free-turbine a. Centrifugal
b. Axial.
When a TPE331 engine is operating at a speed below that which is controlled by the propeller governor, the propeller pitch is controlled by the propeller pitch control propeller governor feather spring.
Three advantages of composite blades over metal blades for turboprop engine propellers are:
1. Low cost
2. Lighter weight
3. Lower notch sensitivity
4. More cost effective
5. Easy to clean three, four and five two, three and four one, two and five.
The most popular type of propeller shaft for both reciprocating and turbine engines is the ____________ shaft. flanged tapered metal.
Proper operation of electric deicing boots on individual propeller blades may best be determined by observing the ammeter or loadmeter for current flow. feeling the boots to see if they are heating. feeling the equience of boot heating and have an assistant observe the loadmeter indications.
When a Pratt & Whitney of Canada PT6 engine is shut down on the ground, the propeller blades move into _______ their position. feather reverse-pitch low-pitch, high-pitch.
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 flexible electrical connectors. By slip rings and brushes.
Propeller fluid anti-icing systems generally use which of the following? Isopropyl alcohol. Ethyl alcohol. Ethylene glycol.
If a flanged propeller shaft has dowel pins check carefully for front cone bottoming against the pins. install the propeller so that the blades are positioned for hand propping. the propeller can be installed in only one position.
The upper practical speed limit for an airplane driven by a conventional propeller is 0.87 1.1 0.6.
The propeller blades installed on a UHB engine have a scimitar shape to increase their critical Mach number minimum mach number maximum mach number.
Cold straightening a bent aluminum propeller blade may be accomplished by the holder of a mechanic certificate with a powerplant rating. an appropriately rated repair station or the manufacturer. a person working under the supervision of the holder of a mechanic certificate with both airframe and powerplant ratings.
What unit in the propeller anti-icing system controls the output of the pump? Pressure relief valve Cycling timer Rheostat.
The application of more protective coating on one blade than the other when refinishing a wood propeller may be necessary to achieve final balancing. should never be done. has little or no effect on operating characteristics.
Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective dome-barrel oil seal piston gasket spider-shaft oil seal.
The amount of torque a temperature-limited turboprop engine is allowed to produce ___________ as the altitude increases. increase decrease.
A small nick in the leading edge of a propeller will cause a _______________ that can break the blade. delamination stress concentration galvanic corrosion.
The two engine controls for a TPE331 engine are: a. power lever
b. speed or condition lever a. power lever
b. free turbine control.
If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is the front cone was not fully bottomed against the crankshaft splines during installation. 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.
On aircraft equipped with hydraucally operated constant-speed propellers, all ignition and magneto checking is done with the propeller in which position? Low RPm High pitch range High RPM.
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