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Propellers
FAA AMP
| Question | Answer |
|---|---|
| how is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full feather position? | electric cutout pressure switch |
| apparent engine roughness is often a result of a propeller unbalance. the effect of an unbalanced propeller will usually be | greater at high RPM |
| where are the high and low pitch stops of a hamilton standard constant-speed or teo-position conterweight propeller located? | in the counterweight assembly |
| how does the aerodynamic twisting force affect operating propeller blades? | it tends to turn the blades to a high blade angle |
| how is anti-icing fluid ejected from the slinger ring on a propeller? | by centrifugal force |
| the propeller governor controls the | oil from the pitch changing mechanism |
| propeller blade station numbers increase from | hub center line to tip |
| which of the following determine oil and grease specifications for lubrication of propellers? | propeller manufacturer's instructions |
| which of the following methods is used to straighten a bent aluminum propeller blade that is within repairable limits? | cold straightening only |
| during engine operation at speeds lower than those for which the constant-speed propeller control can govern in the INCREASE RMP position, the propeller will | remain in the full LOW PITCH position |
| surface treatment to counter the effects of dye-penetrate inspection on a propeller is accomplished by | washing off with solvent |
| the actual distance a propeller moves forward through the air during one revolution is known as the | effective pitch |
| what is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades? | to allow the moisture which may collect between the tipping and the wood to escape (vent the tipping) |
| which of the following best describes the blade movement of the feathering propeller that is in the HIGH RPM position when the feathering action has begun? | low pitch through high pitch to feather position |
| what type of imbalance will cause two-blade propeller to have a persisntent rendency to come to rest in a horizontal position (with the blades parallel to the ground) while being checked on a propeller balancing beam? | vertical |
| propeller blade tracking is the provess of determining | the positions of the tips of the propeller blades relative to each pther |
| the low pitch stop on a constant- speed propeller is usually set so that | the engine will return at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure |
| maximum taper contact between crankshaft and propeller hub is determined using | bearing blue color transfer |
| which of the following statements concerning the installation of a new fixed-pitch wood propeller is true? | inspect the bolts for proper torque after the first flight and after the first 25 hours of flying |
| how is the speed of a constant-speed propeller changed in flight? | by changing the load tension against the flyweights in the governor |
| the thrust produced by a rotating propeller is a result of | an area of decreased pressure immediatly infront of the propeller blades |
| 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 |
| 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 |
| 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 directly to feather position |
| the primary purpose of a cuff on a propeller is to | increase the flow of cooling air to the engine nacelle |
| constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without conterwights increase pitch angle using | oil pressure |
| what are the rotational speed and blade pitch angle requirements of a constant-speed propeller during takeoff? | high speed anf low-pitch angle |
| the angle-of-attack of a rotating propeller blade is measured between the blade chord or face and which of the following? | relative airstream |
| propeller fluid anti-icing systems generally use which of the following? | isopropyl alcohol |
| on most reciprocating multiengine aircraft, automatic propeller synchronization is accomplished through the actuation of the | propeller governor |
| a constant-speed propeller provides maximum efficiency by | adjusting blade angle for most conditions encountered in flight |
| propeller aerodynamic (thrust) imbalance can be largely eliminated by | correct blade contouring and angle setting |
| 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 |
| propeller blade stations are measured from the | hub centerline |
| 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 | fatigue failure |
| which of the following generally renders an aluminum alloy propeller unrepairable? | transverse cracks of any size |
| what actuates the pilot valve in the governor of a constant-speed propeller? | governor flyweights |
| a propeller synchrophasing system allows a pilot to reduce noise and vibrations by | adjusting the phase angle between the propellers on an aircraft's engines |
| (1) during takeoff, propeller trust is greatest if the blade angle of attack is low and the engine power setting is high. (2) with the aircraft stationary, propeller trust is greatest if the blade angle of attack is high anf the engine power setting is.. | only 1 is true |
| propellers exposed to salt spray should be flushed with | fresh water |
| the purpose of permanently sealing and partially filling some models of McCauley propeller hubs with dyed oil is to | make location of cracks readily apparent |
| the holding coil on a hydromatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller | feathering pump motor |
| why is a constant-speed conterweights propeller normally placed in full HIGH PITCH position before the engine is stopped? | to prevent exposure and corrosion of the pitch changing mechanism |
| if propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is | the propeller retaining nut was not tight enough during previous operation |
| what operational force tends to bend the propeller blades forward at the tip | thrust-bending force |
| 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 |
| which of the following functions requires the use of a propeller blade station? | Measuining blade angle |
| what operational force causes the greates stress on a propeller? | centrifugal force |
| which of the following defects is cause for rejections of wood propellers? | an oversize hub or bolt hole, or elongated bolt holes |
| propeller blade angle is the angle between the | chord of the blade and the rotational plane of the propeller |
| geometric pitch of a propeller is defined as the | effective pitch plus slippage |
| what operational force causes propeller blade tips to lag in the opposite direction of rotation? | torque-bending force |
| it is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to | eliminate stress concentration points |
| 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 |
| oil leakage around the rear cone of a hydromatic propeller usually indicates a defective | spider-shaft oil seal |
| when the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition? | overspeed |
| the application of more protective coating on one blade than the other when refinishing a wood propeller | may be necessary to achieve final balancing |
| 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 |
| counterweights on constant-speed propellers are generally used to aid in | increasing blade angle |
| 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 |
| repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following propeller blade areas? | shank |
| how does the propeller overspeed governor on a turboprop engine decrease propeller RPM? | as oil pressure increases, the servo piston is pushed forward, and the feather spring is compressed |
| inspection of aluminum propeller blades by dye-penetrant inspection is accomplished to detect | fatigue failure |
| what action takes place when the cockpit control for a hydromatic, constant-speed propeller is actuated? | compression of the speeder spring is changed |
| how is aircraft electrical power propeller deicer systems transferred from the engine to the propeller hub assembly? | by slip rings and brushes |
| an aircraft's propellers system beta range | is used to produce zero or negative thrust |
| what method would be used to inspect an aluminum propeller blade when a crack is suspected? | dye-penetrate |
| on aircraft equipped with hydraulically operated constant-speed propellers, all ignition and magneto checking is done with the propeller in which position? | HIGH RPM |
| when engine power is increased, the constant-speed propeller tries to function so that it will | maintain the RPM, increase the blade angle, maintain a low angle of attack |
| the pitch-changing mechanism of the hydromatic propeller is lubricated by | the pitch changing oil |
| for takeoff, a constant-speed propeller is normally set in the | LOW PITCH, high RPM position |
| ice formation on a propeller blade will | produce unbalance and vibration |
| what operational force tends to increase propeller blade angle? | aerodynamic twisting force |
| 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 vibrations |
| what is indicated when the front cone bottoms while installing a propeller? | rear cone should be moved forward |
| cold straightening a bent aluminum propeller blade may be accomplished by | an appropriatly rated repair station or the manufacturer |
| the purpose of a three-way propeller valve is to | direct oil from the engine oil system to the propeller cylinder |
| during opp. check of an aircraft using hydromatic full-feathering propellers, the following observations are made: the feather button, after being pushed, remains pressed until the feather cycle is complete, then opens. when unfeathering, it is necessar.. | both feather cycle and unfeather cycle are functioning properly |
| which of the following statements about constant-speed conterwight propellers is also true when referring to two-position counterwight propellers? | blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal |
| during the on-speed condition of a propeller, the | centrifugal force of the governor flyweights is ewual to the speeder spring 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 | antifrictional and plasticity characteristics of grease |
| manually feather a hydromechanical propeller means to | port governor oil pressure from the cylinder of the propeller |
| which of the following is identified as the cambered or curved side of a propeller blade, corresponding to the upper surface of a wing airfoil section? | blade back |
| the centrifugal twistin force acting on a propeller balde is | greater than the aerodynamic twisting force and tends to move the blade to a lower angle |
| why is the pulley stop screw on a propeller governor adjustable? | to limit the maximum engine speed during takeoff |
| 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 prevent impact damage to the tip and leading edge of the blade? |
| which of the following is used to correct horizontal unbalance of a wood propeller? | solder |
| after proper removal of aluminum blade damage, the affected surface should be polished with | very fine sandpaper or crocus cloth |
| in what position is the constant-speed propeller control placed to check the magnetos? | full increase, low propeller blade pitch angle |
| when running-up an engine and testing a newly installed hydromatic propeller, it is necessary to exercise the propeller by moving the governor control through its entire travel several times to | free the dome of any entrapped air |
| if a blade of a particular metal propeller is shortened because of damage to the tip, the remaining blade(s) must be | reduced to confirm with the shortned blade |
| which of the following defects is cause for rejection of wood propellers? | bodning separation of the trailling edge of the propeller blade |
| what is a function of the automatic propeller synchronizing system on multiengine aircraft? | to control engine RPM and reduce vibration |
| which of the following occurs to cause the front cone bottoming during propeller installation? | the front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened agaisnt the cone seats in the propeller hub |
| a fixed-pitch wooden propeller that has been properly installed and the attachment bolts properly torque exceeds the out-of-track allowance by 1/16 inch. the excessive out-of-track condition may be corrected by | placing shims between the inner flange and the propeller |
| when repairing a propeller blade for inspection it should be cleaned with | mild soap and water |
| a powerplant using a hydaulically controlled constant-speed propeller is operating within the propeller's cinstant-speed range at a fixed throttle setting. if the tension of the propeller governor control spring is reduced by movement of the cockpit pro.. | increase, engine manifol pressure will increase, and engine RPM will decrease |
| when lubricating a newly overhauled steel hub propeller, you should lubricate the propeller | after one to two hours of operation |
| which of the following forces or combination of forces operates to move the blades of a constant-speed counterweight propeller to the HIGH PITCH position? | centrifugal force acting on the counterweights |
| when lubricating a Hartzell propeller blade seals, to prevent damage to the blade seals, the service manual may recommend on some models to | remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting. |
| how can a steel propeller hub be tested for cracks? | by magnetic particle inspection |
| blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the | chord of the blade |
| what is the purpose of an arbor used in balancing a propeller? | to support the propeller on the balance knives |
| the primary purpose of a feathering propeller is to | eliminate the drag created by a windmilling propeller when an engine fails in flight |
| what unit in the propeller anti-icing system controls the output of the pump? | Rheostat |
| during which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be the greatest? | high-speed, high-altitude cruising flight |
| what normally prevents a Hartzell compact propeller from going to feather when the engine is shut down on the ground? | a latch mechanism composed of springs and lock pins |
| longitudinal (force and aft) clearance of constant-speed propeller blades or cuffs must be at leasst 1/2 inch (12.7mm) between propeller parts and stationary parts of the aircraft. this clearance is with the propeller blades at | feathered or in the most critical pitch configuration |
| what controls the constant-speed range of a constant-speed propeller? | the mechanical limit in the propeller pitch range |
| the primary purpose of a propeller is to | change engine horespower into thrust |
| removal of propeller blade tips within type certificated data sheet limits when correcting a defect is | a major repair |
| the blade angle of a fixed-pitch propeller | is smallest at the tip |
| the centrifugal twisting moment of an operating propeller tends to | reduce the pitch angle |
| one of the advantages of inspecting an aluminum propeller utilizing dye-penetrant inspection procedure is that | it shows whether visible lines and other marks are actually cracks rather than scratches |
| what will happen to the propeller blade angle and the engine RPM if the tension on the propeller governon control spring (speeder spring) is increased? | blade angle will decrease and RPM will increase |
| how is a propeller controlled in a large aircraft with a turboprop installation? | by the engine power level |
| if flanged propeller shaft has dowel pins | the propeller can only be installed in a given prosition |
| the aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to | increase the pitch angle |
| 1) a mechanic certificate with a powerplant rating authorizes the holder to repair deep scars, nicks and dents.. 2) a mechanic certificate with a powerplant rating authorizes the holder to perform a minor striaghtening of steel propeller blades. | neither one is true |
Created by:
cordon.gabriel
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