Modulo 17

High speed propellers are designed to. rotate at high RPM. operate at high forward speeds. operate at supersonic tip speeds.

When in the windmill position ATM. opposes CTM. is not related to CTM. assists CTM.

The optimum angle for a fixed pitch propeller is. 15 degrees. 2 - 4 degrees. 6 - 10 degrees.

A left handed propeller is one that. rotates clockwise when viewed from the rear. rotates clockwise when viewed from the front. is fitted to an engine on the left side of the aircraft.

Forces acting on a propeller are. centrifugal, twisting, and bending. torque, thrust and centrifugal. torsion, tension and thrust.

The blade angle at the root is. less than the tip. same from tip to root. greater than the tip.

What force on a propeller blade turns the blades to a fine pitch?. ATM. Torque. CTM.

The purpose of propeller twist is. coarsen the blade angle at the root. to maintain Blade Angle along the blade. to maintain Angle of Attack at the same value along the blade.

The forces acting on a propeller blade are. bending, twisting and centrifugal. thrust, aerodynamic and tension. thrust and torque.

Blade angle at the root is. low. high. master blade angle.

Blade angle is taken from the chord and. propeller shaft. relative airflow. plane of rotation.

What forces act on a propeller blade?. Thrust and torque. Bending, thrust, torque. Bending, CTM and A TM.

CTM will. try to bend the blade away from the engine. turn the blade about the lateral axis. cause the tips to rotate at supersonic speeds.

From reverse pitch, to return to normal pitch it. passes through coarse then fine. passes through coarse. passes through fine.

When in reverse pitch, CTM will tend to move the propeller blades towards. a positive pitch. a position depending on rpm. a negative pitch.

If the blade angle is increased. the pitch becomes finer. the pitch becomes coarser. lateral stability decreases.

As a propeller blade moves through the air, forces are produced, which are known as. lift and torque. lift and drag. thrust and torque.

A rotating propeller imparts rearwards motion to a. small mass of air at high velocity. large mass of air at low velocity. small mass of air at low velocity.

Propeller efficiency is. the ratio of output speed to input propeller speed. the ratio of the work applied to the geometric pitch to useful work on the C.S.U. the ratio of the useful work done by the propeller to work done by the engine on the propeller.

Geometric Pitch is the distance moved. in one revolution without slip. in one revolution with slip. in one revolution.

Propeller torque is the resistance offered by the propeller to. feathering. changing pitch. rotation.

The angle between the resultant airflow direction and the propeller blade plane of rotation is known as. angle of attack. blade angle. helix angle or angle of advance.

Coarse pitch is used for. take off and climb. maximum economical cruise in level flight. landing and power checks.

Effective pitch is. distance moved in one revolution. geometric pitch plus slip. pitch measured at the master station.

A windmilling Propeller has. a small positive blade angle. a small positive angle of attack. a small negative angle of attack.

Windmilling causes. propeller underspeeding. maximum propeller drag. centrifugal Twisting Moment.

Torque acts. in the same direction as the plane of rotation. at right angles to the plane of rotation. in opposition to the direction of rotation.

The purpose of blade twist is to. reduce angle of attack at the blade root. to ensure that tip speed does not go faster than Mach 1. to even out thrust distribution across the propeller.

Thrust is greatest. at 70 to 80% of propeller length. in the first 50%. the same all along the length.

CTM changes the pitch of a blade. about its twisting axis. bending forward. towards the feather plane.

The velocity of the slipstream behind the aircraft in relation to the ambient air is. less. greater. equal.

High speed aerofoils are employed at. the master station. the tips. the root.

A right hand propeller. rotates clockwise when viewed from the rear. is always fitted to the starboard engine. rotates clockwise when viewed from the front.

A right hand propeller rotates clockwise when viewed from the rear. is always fitted to the starboard engine. rotates clockwise when viewed from the front. rotates clockwise when viewed from the rear. is always fitted to the starboard engine. rotates clockwise when viewed from the front.

Given that blade angle is measured from the centre of the hub, the blade angle at the hub is considered to be. lowest. Master Station value. highest.

A windmilling propeller will create. more drag in feather. more drag in fine pitch. more drag in coarse pitch.

The chord line of a propeller is. a line joining the leading and trailing edges. a line joining the tip to the root of the blade. a line joining the tips of the blades.

The plane of rotation is defined as. the plane in which thrust force acts. the plane in which the propeller rotates. the angle at which the blade strikes the airflow.

Thrust bending force on a propeller blade. intensifies the centrifugal forces to some degrees. can be used in propeller design to reduce some operation stress. tends to bend the propeller blade forward at the tip.

What conditions are applied to a propeller blade windmilling?. Positive angle of attack, thrust negative. Negative angle of attack, thrust positive. Negative angle of attack, thrust negative.

The primary purpose of propeller is to. change engine horsepower to thrust. provide static and dynamic stability to aircraft. create lift on the fixed aerofoils of an aircraft.

The primary purpose of a feathering propeller is to. prevent further engine damage when an engine fails in flight. prevent propeller damage when an engine fails in flight. eliminate the drag created by a windmilling propeller when an engine fails in flight.

A fibreglass composite blade. will never be struck by lighting. does not require lightning strike protection. requires lightning strike protection.

The timber most often used today for propeller construction is. birch. spruce. balsa.

Electronic torque measuring systems utilise. strain gauges in the reduction gear. stress gauges in the reduction gear. pressure transducers in the reduction gear.

A conventional turboprop torque meter uses. hydraulic oil as the pressure medium. coiled spring levers as the pressure medium. engine oil as the pressure medium.

Metal at the tip and along the leading edge of a wooden propeller is for. balancing. protection. anti-icing.

48) Blade cuffs are fitted to the root of the blades. to increase the strength of the blade. to increase thrust. to increase flow of cooling air into the engine nacelle.

Low torque sensing is used to. increase power. increase pitch. initiate auto-feather.

Torque sensing is used to. reduce drag. reduce drag following engine shutdown. synchronise blade angle.

The minimum percentage seating on a propeller rear cone should be. 90%. 70%. 95%.

The thrust of a propeller is normally taken by the. torque meter. propeller rear cone. front bearing in the reduction gear.

On which type of turbo-propeller would you expect to find a parking brake?. Compounded twin spool. Direct coupled twin spool. Free turbine.

What does the torquemeter reading indicate in a gas turbine engine?. Torque reaction at the reduction gear. The ratio between engine thrust and engine torque. Engine torque.

The gear segments on the blade roots of a hydromatic propeller mesh with the. stationary cam. torque tubes and eye bolts. moving cam.

A propeller is centralised on the propeller shaft by. the front and rear cones. the front git seal. the rear pre-load shims.

Reduction gearing allows the blade tips. to operate below the speed of sound. to operate above the speed of sound. to rotate slower than the root of the propeller blade.

When fitting a propeller to a tapered shaft. locate the master spline. ensure the master spline and blade alignment are in accordance with the MM. ensure fully seated.

What is the purpose of small holes at the tip of wooden propellers?. Drainage. Balancing. Pivot points used during manufacture.

The thrust face of a propeller blade is the. root to which the gear segment is fitted. blade face or flat side. blade back or curved side.

Solidity of a propeller can be increased by increasing. blade chord. blade angle. blade thickness.

A turbo-prop engine. uses an epicyclic reduction gear system. uses a spur gear reduction system. does not require a reduction gear system due to the prop.

Total power of a turbo-prop engine is measured in. Equivalent Shaft Horsepower (ESHP). Shaft Horsepower (SHP). Brake Horsepower (BHP).

The disadvantage of using reverse pitch on a turbo-propeller engine is. exhaust gas ingestion , high gas temperature and debris ingestion. debris ingestion. high gas temperature.

A compound twin spool engine is. turbo prop propeller driven by a power turbine. turbo prop twin spool compressor. LP Compressor driven by a free turbine.

With the engine stationary the indication that the propeller is in ground fine pitch is. blade and spinner markings aligned. below stop warning light on. flight fine pitch stop lever withdrawn.

When the power lever on a turbo prop engine is moved from ground idle to flight fine the fuel flow. increases. decreases. remains the same.

How is the blade station measured?. In inches from the centre of the hub. In inches from the tip. As a percentage of blade length from the tip.

The oil used in the torquemeter system is. DTD 5 8 5. engine oil pressure boosted by a pump driven off the reduction gear. PCU oil pressure.

Which type of turboprop engine is practically free from surge and requires low power for starting?. Compound twin spool. Directly coupled. One using a centrifugal compressor.

Blade stations are measured from the. centre of the hub. tip. shank.

Auto feathering is disarmed. during landing. during take off. in the cruise.

With a multi-engined aircraft the torque pressure would be. There is only one gauge for all engines. same on all engines. similar on all engines.

If torque pressure fell to zero during the cruise what would indicate that the gauge had failed?. Engine would auto feather. Engine would overspeed. Engine would continue to run.

The purpose of using reverse pitch propellers is to. provide aerodynamic breaking. allow aircraft to taxi backwards. reverse the direction of rotation of the propeller.

The RPM of a windmilling propeller is primarily related to. EAS. IA S. TAS.

A ducted propeller is used because. ducted props give more thrust for the diameter of disc. only ducted propellers can be vectored. ducted props give less thrust for the diameter of disc.

A two position prop uses. high pitch for take off and low pitch for cruise. low pitch for take off and climb and high pitch for cruise. high pitch for take off, low pitch for climb and descent and high pitch for cruise.

A propeller operating in the Beta range is operating between. Flight Idle and Ground Idle. coarse and flight fine pitch. maximum reverse pitch and Flight idle pitch.

The CSU oil pump is provided to. boost engine oil pressure to decrease pitch. boost engine oil pressure to alter pitch. boost engine oil pressure to increase pitch.

Counterweights are used to. counter the A TM of the blades. counteract the CTM of the blades. balance the blades.

The pressure face of a propeller is. the flat face. the leading edge. the camber face.

In blade station numbering the stations nearest the hub are. datum. highest. lowest.

A propeller mounted forward of the engine is known as. hydromatic propeller. a tractor propeller. a pusher propeller.

Contra-rotating propellers are. two propellers on the same shaft on one engine-each revolving in a different direction. propellers geared to rotate in the opposite direction to the engine. propellers on a twin engined aircraft revolving in opposite directions.

An aerodynamic braking propeller goes through. the feathered pitch position to act as a brake. the coarse pitch position to act as a brake. the fine pitch position to act as a brake.

The term spinner is applied to. a propeller tip vortex. a streamline covering over the propeller hub. an acrobatic manoeuvre.

Turbo-prop engines require a slightly higher viscosity oil than a turbo-jet engine due to. lower engine rpm. higher engine rpm. reduction gear and propeller pitch chang mechanism.

A propeller has the requirement of a. manufacturers data plate. type certificate or equivalent certificate. batch number.

Variable pitch propellers are used because they are. reduce vibration and noise. have peak efficiency over a greater speed range. more economical.

The condition lever normally has the following settings. normal, beta-range and reverse range. cut-off, idle and high idle. rich, lean and cut-off.

What is the ground clearance for a Tricycle Geared Aircraft?. 7 inches. 9 inches. 1 inch.

In a variable pitch propeller system, a decrease in propeller RPM will alter the angle of attack on the blade to. increase negative torque. decrease angle of attack. increase angle of attack.

To achieve reverse pitch the blade angle must be. more than 17°. less than 0°. more than 90°.

Centrifugal latches are fitted to lock the propeller. in the feathered position. when stationary. in the fine pitch position.

Counterweights are fitted to blade root to. counteract A TM. assist blade to move to fine pitch. counteract CTM.

The limits for blade angle are controlled by pitch stops on the. propeller shaft. blade root. cylinder.

The range of angles of a VP propeller is usually limited by. the fine pitch position. the feathering angle. coarse and fine pitch stops.

The purpose of fine pitch stop is to. maintain constant speed in flight. prevent the propeller moving below flight fine pitch in flight. maintain maximum RPM at takeoff.

Which best describes a Variable Pitch propeller?. The blade angles can be changed in flight. Its blade angles are set with an automatic system with which the pilot has no input. Its blade angles can only be set on the ground.

The holding coil of a hydromatic propeller feathering button switch holds a relay closed that applies. dome feathering mechanism. feathering pump motor. governor.

The primary purpose of the front and rear cones for propellers that are installed on splined shafts is to. 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. position the propeller hub on the splined shaft.

The constant-speed control unit is also called a. propeller pitch control. accumulator. governor.

When the compressive force on a speeder spring is reduced, the propeller blades will. remain fixed. fine off. coarsen.

A hydraulic pitch lock is utilised in a hydromatic propeller to lock out the course pitch oil line in the event of underspeeding. lock out the fine pitch oil line in the event of overspeeding. prevent the propeller overspeeding in the event of oil supply failure. lock out the course pitch oil line in the event of underspeeding. lock out the fine pitch oil line in the event of overspeeding. prevent the propeller overspeeding in the event of oil supply failure.

When in the beta range, the propeller pitch is controlled. directly from the power lever. indirectly from the power lever. directly from the pitch change mechanism to the PCU.

The advantage of the beta range is it allows. high power settings with higher than normal pitch settings when in flight. low fine pitch settings with high power. low power settings with higher than normal pitch setting for ground manoeuvres.

If the speeder spring pressure of a CSU is increased the blade will. coarsen off. fine off. will not move.

On an underspeed condition the blades are turned to. fine. feather. coarse.

In a hydromatic propeller with counterweights, what is used to make the propeller move to fine pitch?. A T M. engine oil. centrifugal force acting on the counterweight.

Relaxing tension on the governor spring will result in the blade coarsening and. RPM decreasing, manifold pressure increasing. RPM increasing, manifold pressure increasing. manifold pressure constant, RPM decreasing.

The ground fine pitch stop is. never removed. removed on the ground. removed during flight.

If governor flywheel overcomes the speeder spring, it indicates. underspeed. overspeed. onspeed.

Pitch control using torque measuring is for. reducing drag in engine failure. increasing drag. reducing drag in binding.

If force is applied to the speeder spring by control lever, what will happen?. Blade angle coarsen. Blade angle is frozen in last known position. Blade angle finer.

When is superfine pitch used?. Landing and takeoff. In cruise. Engine starting to reduce propeller torque loading on starter motor.

When the flyweights fly outwards in a PCU, this is known as. onspeed. overspeed. low power settings with higher than normal pitch setting for ground manoeuvres.

On a reversing propeller moving to the maximum reversing angle, the propeller goes. from fine pitch through plane of rotation, course reverse then fine reverse. from course pitch through plane of rotation course, fine reverse then course reverse. from fine pitch through plane of rotation, fine reverse then course reverse.

If pressure is increased on the speeder spring, rpm increases. What happens to the blade angle?. Remains unchanged. Increases. Decreases.

In a prop with counterweights, what is used to make it move to fine pitch?. ATM. Centrifugal force acting on the counterweight. Governor oil pressure.

If a propeller is in fine pitch and then moves to feather it will pass throug. flight fine only. reverse. coarse.

A "double" acting propeller has. nitrogen or air on one side of piston. oil pressure on one side of piston. oil pressure on two sides of piston.

During normal propeller operation, oil pressure for the governor is provided by. a pump in the governor. a variable volume pump. the engine driven pump.

Oil for an on-speed condition passes through. the coarse pitch line. the fine pitch line. neither of the lines.

If the spur gear pump in a single acting propeller governor failed, the. blades would turn to a coarse pitch. blades would rotate to a fine pitch. blades would move to the feather position.

The hydromatic variable pitch propeller is operated on the principle of. oil pressure moving a piston. an electrical motor moving a gear segment. a venturi or 'u' tube with mercury.

The constant speed unit (C.S.U.) governor works on the principle of. manual selection through a gearbox. centrifugal twisting moments. spring pressure acting against centrifugal force.

The purpose of the pitch change cams is to. convert rotary motion to linear motion. prevent windmilling. convert linear motion to rotary motion.

The gear type pump in a C.S.U. or P.C.U. lubricates the entire propeller system. boosts engine oil system pressure. assist the governor valve to move.

When an engine fails. the propeller is feathered using an electrical feathering pump. the propeller is feathered using the propeller governor pump. the propeller is feathered using counterweights.

The purpose of an accumulator in a single acting propeller system is to. accelerate the unfeathering process. to port oil to the coarse pitch oil line to assist in feathering the propeller. provide back up to the governor pump.

When auto feathering has taken place the feathering pump is switched off by. pressure control drop switch. carrying out the manual feather drill. removing the pump circuit breaker or fuse.

On a free turbine engine it is possible to vary the propeller RPM whilst the engine RPM remains constant. by operating the PCU control Lever. it is not possible to vary the propeller RPM. by operating the Power lever.

A propeller control unit hydraulic system is supplied with oil from the. engine lubrication oil tank. aircraft hydraulic System. PCU oil tank.

Low torque sensing is used to initiate. relighting. fine pitch selection. auto feathering.

What is the purpose of the auto coarsening system?. To prevent overspeeding in the event of the flight fine pitch stop failing. To reduce drag during power loss. To save the pilot making minor changes when changing altitude.

In a single acting propeller, blade angle is increased by. counterweights and a feathering spring. CTM. oil pressure.

The function of a propeller pitch lock is to prevent the propeller from. coarsening. reducing below flight fine pitch. fining off in the event of pitch lock mechanism failure.

The minimum propeller pitch is established by the. pitch lock. superfine pitch stop. flight fine pitch stop.

Oil for the feathering system is taken from. a separate feathering oil tank. a feathering reserve in the engine oil tank. the engine lubrication system.

What are the centrifugal latches in a single acting propeller used for?. Prevent CTM. Prevent feathering of the prop on shutdown. Prevent Propeller moving to superfine.

In a two position propeller. A TM turns the prop to fine. oil pushes the prop to fine. oil pushes the prop to coarse.

An overspeed condition causes governor spring pressure to be. the same as centrifugal force. more than centrifugal force. less than centrifugal force.

When the engine is running, the CSU is sensing. propeller tip speed. propeller blade angle. engine RPM.

An accumulator may be fitted to. feather the propeller. unfeather the propeller. provide emergency control.

If governor weight spring pressure is reduced. governor weights will pivot inwards raising the governor valve allowing the blades to move to a coarser pitch. governor weights will spring outwards raising the governor valve allowing the blades to move to a finer pitch. governor weights will spring outwards raising the governor valve allowing the blades to move to a coarser pitch.

A constant speed variable pitch propeller is running whilst stationary on the ground. If it is facing into a headwind it will. slow down. remain constant. speed up.

If the TAS of an aircraft increases, the CSU will. increase the blade angle to provide constant RPM. decrease the blade angle to provide constant RPM. change the blade angle to provide constant RPM.

When governor spring load is less than governor weights, the CSU is in. underspeed. overspeed. normal.

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

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

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. block governor oil pressure from the cylinder of the propeller.

How is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full-feathered position?. Stop lugs in the teeth of the rotating cam. Electric cut-out pressure switch. Pulling out the feathering push-button.

Counterweights on constant-speed propellers are generally used to. increase blade angle. decrease blade angle. unfeather the propeller.

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

What are the rotational speed and blade pitch angle requirements of a constant-speed propeller during take-off?. High speed and low pitch angle. High speed and high pitch angle. Low speed and high pitch angle.

A constant speed propeller provides maximum efficiency by. increasing the lift coefficient of the blades. adjusting blade angle for most conditions encountered during flight. increasing blade pitch as the aircraft speed increases.

Synchrophasing reduces vibration by the use of. pulse probes and a single synchrophase unit. tachometers and correction motors. coordinating the rpm of each engine.

Synchronising can only be achieved if the slave propeller is. the same speed as the master. within 20 rpm of the master. within 100 rpm of the master.

Synchronising is carried out to. match engine rpm. match propeller tip speed. match blade phase angle difference.

The synchronisation governor monitors. RPM. propeller tip speeds. thrust tip speeds.

Synchronisation is used to. reduce vibration and noise. reduce the pitch of the fastest running blade. preset the phase angle of propellers.

Synchronisation is used. on the ground. in flight except landing and take off. in flight.

The propeller synchronising system is put into operation by. adjusting the engine rpm at required cruise speed then switching on the synchroniser. adjusting the engine rpm then propeller rpm to required speed then switching on. switching on the synchronizer then adjust the engine rpm so that all engines adjust together.

Propellers are synchronised by the. power lever. PCU governor. prop lever.

Unlike the automatic synchronizing system, the synchrophasing system of a two-propeller aircraft. sets the blade phase angle of two constant speed propellers. causes the same rotation speed of the two propellers. matches the blade angle of variable pitch propellers.

In a propeller synchrophasing system, an electric actuator. rotates (controls) the slave engine governor. equalizes the governor signals. turns the flexible shaft leading to the trimmer assembly.

If one signal is lost into the comparator unit when Synchrophasing is operating. both engines remain running until there is a difference, of commonly, (4 to 5 percent), at which the slower of the engines is then feathered. the slower engine immediately goes to feather. synchrophasing is lost and the engines continue to function normally.

Synchronisation controls RPM within what range?. 100 RPM. 150 RPM. 50 RPM.

When should synchronisation be used?. During cruise. During landing. A nytime.

Propeller Synchronizing works utilizing. RPM Levers. propeller lever. governor.

In relation to a propeller aircraft, synchrophasing would be used on. all Aircraft. all multi engine aircraft. turbo prop Aircraft.

A propeller synchrophasing system allows a pilot to reduce noise and vibration by. setting the RPM of all propellers exactly the same. adjusting the plane of rotation of all propellers. adjusting the phase angle between the propellers.

A propeller synchronising system allows a pilot to reduce noise and vibration by. adjusting the phase angle between the propellers. setting the RPM of all propellers exactly the same. adjusting the plane of rotation of all propellers.

What is the function of automatic propeller synchronizing system on multiengined aircraft?. To control tip speed of all propellers. To control the power output of all engines. To control engine RPM and reduce vibration.

On most reciprocating multiengined aircraft, automatic propeller synchronization is accomplished through the actuation of the. propeller governors. propeller control levers. throttle levers.

Electrically de-iced propeller slip rings have regular resistance checks for. oxidisation due to altitude. open circuit heating elements. wear between brushes and slip ring.

Propeller anti-icing may be achieved by. using commercial de-icing fluid sprayed on the propeller. using iso-propyl alcohol de-icing fluid sprayed on the blade. a using hot air from the compressor.

De-icing of the propeller can be monitored by. viewing the deicing fluid level sight glass. viewing the blade and observing ice falling off the blade. an ammeter in the flight deck.

Insulation testing of electrical de-icing systems should be periodically carried out because of. an open circuit in one of the blades. oxidation due to atmospheric conditions. wear on the slip rings.

Insulation checks on propeller electrical heating elements should be carried out frequently due to. short/open circuits in the heating system wires along the propeller blade. oxidation of slip ring and brush gear assembly. deposits formed due to the wear of slip ring and brush gear assembly.

Where is the de-icing boot?. Root. Trailing edge. Tip.

How is anti icing fluid fed to the individual blades?. Pump to a slinger ring. Pump to each blade rubber feed boot. Under gravity to the slinger ring then on to the blade.

Ice is removed from blades by. a continuously heated electrical boot. rubber boots inflated in sequence using compressor hot air. inboard and outboard boot sections heated in sequence by action of the timer.

Propeller blades are de-iced by. electrical heating elements bound in rubber overshoes on the blade leading edges. generating eddy currents in the blade. electrical heating elements wound around rubber shoes.

Electrical power supplies on large aircraft, for electrical deicing are. AC. DC. Both AC or DC.

Propeller slip rings. convey oil for PCU to pitch change mechanism. minimise slip. conduct electrical power for de-icing.

On an electrical deicing system fast cycle is used. at low air temperature. at high air temperature. on the ground.

The output of an anti-icing pump is controlled by. a rheostat. the hand pump. a cyclic timer.

De-icing fluid goes to a slinger ring from. an electrical pump. a hand pump. a tank in the prop hub, providing constant feed once released.

To increase anti icing effectiveness. increase cycle times. increase the AC or DC current. use liquid as well as electrical anti icing systems.

Propeller de-icing for varying rates of icing can be varied by. increasing propeller RPM. increasing cyclic timing. increasing the AC or DC voltage.

Propeller De-icing can be checked by. checking the the de-icing ammeter. checking the torque meter for abnormal readings. visually checking for ice on the blades.

Proper operation of electric deicing boots on individual propeller blades may be best determined by. feeling the sequence of boot heating and have an assistant observe the loadmeter. indications. feeling the boots to see if they are heating. observing the ammeter or loadmeter for current flow.

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

Ice formation on the propellers, when the aircraft is in flight, will. decrease available engine power. increase aircraft stall speed and increase noise. decrease thrust and cause excessive vibration.

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

Thrust and camber faces of a propeller should be blended out to. 5 times the depth of damage. 10 times to the depth of damage. 30 times to the depth of damage.

An aerodynamic correction factor that is preceded by the letter Q indicates. thrust balance. dynamic balance. torque balance.

Leading edges should be blended out to. 5 times the depth of damage. 10 times the depth of damage. 30 times the depth of damage.

If the tip of an electrical overshoe is torn. it may be cut back. it may be classified as acceptable damage. it must not be cut back.

The shank of the propeller is permitted to have. no repairs. minor repairs. no decals fitted.

When blending out a gouge on the face or camber side of a blade, the additional metal to be removed for stress relief is. 0.02 inch. 0.002 inch. 0.2 inch.

Wooden propellers are permitted. repairs that do not affect weight and balance. no repairs. repairs using sawdust and aeroglue.

The preservative used to protect metal blades is. lanolin. brown storage wax. petroleum jelly.

Composite propellers may have minor repairs carried out by. any approved 3rd party maintenance organization. the operator. any approved composite repair facility.

Details of propeller overhaul may be found in. Airworthiness Notice 75. the AMM. Airworthiness Notice 55.

The ground clearance of a single engine tail wheel aircraft propeller is measured with the aircraft. tail wheel on the ground. tail wheel in the take off position. in the rigging position.

The structural clearance of a multi engine aircraft propeller. is taken between the engines with the props aligned. is taken between the prop and the fuselage. is taken from the ground.

What position should the blades be when installing the pitch change mechanism onto a hydromatic propeller?. Feather. Zero pitch. Full reverse.

The ground (sea) clearance of a sea plane propeller is. 1 inch. 9 inches. 18 inches.

Cropping is permitted to a maximum of. 1 inch on all blades. Â1⁄2 inch on all blades. Â1⁄2 inch on one blade only.

Dynamic balance is confirmed by use of. knife edges and mandrel. a tracking check. a vibration analyser.

A metal propeller may be statically balanced by. adding varnish to the lighter blade. removing metal from the opposite blade. adding or removing lead wool to the hollow blade roots.

Mechanical vibration relating to propellers in a piston powered aircraft. is due to the crankshaft at intermittent power settings. is due to the lead lag of the propeller compared to the engine. is due to the power stroke of the engine and may have a more detrimental effect than aerodynamic vibration.

Aerodynamic Correction Factor (A C F). corrects for static balance. is indicated in the form of degrees and minutes of pitch. corrects for dynamic balance.

A propeller with an adjustable blade can be adjusted. on the ground with the engine stationary. in flight. on the ground with the engine running.

When on the ground with the engine idling the prop control should be. fully aft with the mixture at idle. fully aft with the mixture at rich. fully forward with the mixture at idle.

Operation with the engine at maximum boost should be limited to. prop at fine to prevent overstressing the engine. prop at course to prevent overstressing the engine. prop at windmill to prevent overstressing the engine.

Damage to a leading edge can be blended in comparison to a blade face. by maintaining a smooth depression. by not exceeding 25% of the chord. at a steeper angle.

The longitudinal clearance between the nose wheel and the propeller on a tricycle geared propeller is. 9 inches. 18 inches. 1/2 inch.

A tracking check compares. 2 Adjacent blades. 2 Opposite blades. any 2 blades.

A line of indentations at one blade section can be. blended within limits. left for up to 12 months. declared unserviceable.

Propeller vibration due to a problem with propeller installations would have a. the same frequency as turbine vibration. lower frequency than turbine vibration. higher frequency than turbine vibration.

Preloading propeller blades before installation prevents. blade distortion. blade flutter. aerodynamic imbalance on the blades.

When unfeathering a propeller, the blade should be put into what position to stop propeller overspeed?. Negative pitch. Fine pitch. Coarse pitch.

Blade angle is measured using a. clinometer. propeller protractor. bevel protractor.

In the Beta range, angle of attack increases. The fuel flow increases, and what else increases?. Fuel temperature. EPR and fuel temperature. RPM and EGT.

With a propeller defect, the frequency of vibration will be. higher than a auxiliary gearbox defect. lower than a turbine defect. higher than a turbine defect.

Blending of propeller blade defects refers to the. repainting of blade tips after cropping. matching of paint finishes for appearances. conversion of rough or sharp edges into smooth depression.

Removal of material from the propeller blade tips, resulting in a reduction in propeller diameter is called. tipping. cropping. topping.

Prior to using the universal propeller protractor. ensure the propeller blade is at the horizontal. determine the reference blade station. check date stamp for serviceability.

To fit a new front cone to a prop shaft firstly. etch the propeller serial number to the rear face. cut in half with a hacksaw and etch a unique serial number to both halves. coat in Engineers blue to ensure seating in the propeller front boss.

Blade tracking is adjusted by. adding lead wool to the blade shank. re-seating the propeller on the front and rear cones. by fitting shims to the propeller shaft hub.

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

To conduct a power check of an internal combustion engine requires. coarse pitch setting and advance the throttle to the target RPM. fine pitch setting and advance the engine to the target RPM setting. fine pitch setting and advance the engine to the max RPM setting.

The power output of a turboprop engine is checked by. reference RPM. reference Thrust. reference Torque.

Immediately after blending out damage to a blade the repair must be. re-protected against corrosion. crack checked. balanced.

How is the efficiency of a turbo prop engine assessed?. By correcting propeller RPM for ambient Air temperature and barometric pressure. By comparing compressor and propeller RPM against a reference figure. By comparing torque meter pressure against a reference figure.

The limits for a tracking check are. 1/4 inch maximum difference between adjacent blades. 1/8 inch maximum difference between opposite blades. 1/8 inch maximum difference between all blades.

After a lightning strike. the prop must be tracked. the propeller shaft should be checked for concentricity. the heater elements should be checked for continuity and insulation.

After overspeeding to 110%. no action is required. return propeller for overhaul. remove propeller for inspection.

Indentations to the blade face are measured. individually. individually and collectively. collectively.

When a propeller has had a report of overspeeding. procedure is dependant on the extent of overspeeding. the propeller must be removed and sent to the manufacturer. the propeller must be removed and tracked.

The most significant effect of stone chips on a propeller is. thrust output of the propeller. structural integrity of the propeller. aerodynamic capability of the propeller.

Ground running an aircraft with a fixed pitch prop with its tail into wind causes the engine RPM to. increase. stay the same regardless of wind direction. decrease.

Adjustments to a variable pitch propeller are. made in the air using the synchronizer. made on the ground with the engine stationary. made on the ground with the engine running.

When a propeller is removed, the securing parts are kept with all separately in cases. the propeller. the engine. all separately in cases. the propeller. the engine.

During engine warm up the mixture should be at. rich, blades at feather. lean, blades at superfine. rich, blades at superfine.

When unfeathering a propeller use. minimum RPM/min throttle. any RPM min throttle. maximum RPM/min throttle.

How is the concentricity of a propeller shaft checked?. Micrometer. Dial Test Indicator (DTI). Ring gauge.

Propeller slip rings should be. lubricated with silicon grease. lubricated with graphite grease. cleaned and left dry.

A splined hub is found be loose with the. excessive spline wear. front cones bottomed against the front end of the splines. retaining nut torque loading too low.

When measuring RPM on a supercharged engine with variable pitch. maximum boost pressure and actual air pressure is used. engine boost pressure and actual air pressure is used. zero boost pressure and actual air pressure is used.

On propeller securing plates circlips should be. annealed and the springiness put back into the circlip before it can be used again. used once only. used again as long as the circlip springs back first time.

The cause of propeller out-of-track vibration is. propeller blade angle too large. static imbalance. blade stiffness not exactly matched.

How is blending carried out on an aluminium propeller blade?. By using a course file and peening. By using a needle file and finish with emery cloth. By using a scraper.

Where would you find information on RPM and Power ratings?. Painted onto the propeller. Engine Log book. Etched on the Propeller.

On a Hartzell prop with counterweights, full oil supply would indicate. on-speed condition. overspeed condition. underspeed condition.

If a 2 blade prop is placed on a knife edge and it ends up horizontal (blades at 3 and 9 o"clock positions), it is said to be in balance. vertically. horizontally. dynamically.

High Engine Oil pressure may be caused by. blocked scavenge filter. restricted pump operation. higher oil pressure.

Which of the following defects is cause for rejection of wooden propellers?. An oversize hub or bolthole or elongated bolt holes. No protective coating on propeller. Solder missing from screw heads securing metal tipping.

Inspection of a propeller blade by dye penetrant inspection is accomplished to detect. cracks. corrosion at the blade tip. torsional stress.

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

Which of the following determines oil and grease specifications for lubrication of propellers?. Propeller manufacturers. Engine Manufacturers. Airframe manufacturers.

What type of imbalance will cause a two-bladed 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 balance beam?. Harmonic. Vertical. Horizontal.

What is the purpose of an arbor used in balancing a propeller?. To support the propeller on the balance knives. To mark the propeller blades where weights are to be be attached. To level the balance stand.

The application of more protective coating on one blade than another when refinishing a wood propeller. has little or no effect on operating characteristics. may be necessary to achieve final balancing. should never be done.

Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be. greater at high RPM. greater at low RPM. approximately the same at all speeds.

Propeller aerodynamic (thrust) imbalance can be largely eliminated by. correct blade contouring and angle setting. static balancing. keeping the propeller blades within the same plane of rotation.

Propellers exposed to salt spray should be flushed with. fresh water. soapy water. stoddard solvent.

How can a steel propeller hub be tested for cracks?. By magnetic particle inspection. By anodizing. By etching.

Which of the following defects is cause of rejection of a wood propeller? An oversize hub or bolt hole, or elongated bolt holes. Solder missing from screw heads securing metal tipping. No protective coating on propeller. An oversize hub or bolt hole, or elongated bolt holes. Solder missing from screw heads securing metal tipping. No protective coating on propeller.

Longitudinal (fore and aft) clearance of constant speed propeller blades or cuffs must be at least 1/2 inch (12.7 mm) between propeller parts and stationary parts of the aircraft. This clearance is with the propeller blades. at the lowest pitch angle. at take-off pitch (maximum thrust) angle. feathered or in the most critical pitch configuration.

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

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. remove any entrapped air. test the maximum RPM setting of the governor. seat the blades fully against the low pitch stop.

What is indicated when the front cone bottoms while installing a propeller?. Blade angles are incorrect. Propeller-dome combination is incorrect. Rear cone should be moved forward.

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.

If the propeller cone 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. 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.

On aircraft equiped with hydraulically operated constant speed propellers, all ignition and magneto checking is done with the propeller in which position?. Low RPM. High pitch range. High RPM.

Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective. spider-shaft oil seal. piston gasket. dome-barrel oil seal.

Maximum taper contact between crankshaft and propeller hub is determined by using. a micrometer. a surface gauge. bearing blue colour transfer.

Propeller blade tracking is the process of determining. the plane of rotation of the propeller with respect to the aircraft longitudinal axis. that the blade angles are within specified tolerance of each other. the positions of the tips of the propeller blades relative to each other.

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

If a flanged propeller shaft has dowel pins. the propeller can be installed in only one position. check carefully for front cone bottoming against the pins. install the propeller so that the blades are positioned for hand propping.

Repairs of aluminium alloy adjustable pitch propellers are not permitted to be made on the. face. shank. back.

Which of the following methods is used to straighten a bent aluminium propeller blade that is within repairable limits?. Either hot or cold straightening, depending on the location and severity of damage. Cold straightening only. Careful heating to accomplish straightening, followed by heat treatment to store original strength.

It is important that nicks in aluminium alloy propeller blades be repaired as soon as possible in order to. maintain equal aerodynamic characteristics between blades. eliminate stress concentration points. equalize the centrifugal loads between the blades.

Minor surface damage located in a repairable area, but not on the leading or trailing edges of aluminium blades, may be repaired by first. filing with a half round or flat file. sanding and applying a proper filler. filing with a riffle file.

Minor surface damage located in a repairable area, but not on the leading or trailing edges of composite blades, may be repaired by. filing with a riffle file. sanding and applying a proper filler. filing with a half round or flat file.

After removal of aluminium blade damage, the affected surface should be polished with. fine steel wool. very fine sandpaper. powdered soapstone.

When preparing a propeller blade for inspection it should be cleaned with. mild soap and water. steel wool. methyl ethyl ketone.

What method would you use to inspect an aluminium propeller blade when a crack is suspected?. Dye penetrant inspection. Magnetic particle inspection. A bright light and magnifying glass.

Removal of propeller blade tips within the Type Certificate Data Sheet limits to correct a defect is. a major repair. permitted under the privileges and limitations of a category B1 licence. a major modification.

Which of the following generally renders an aluminium alloy propeller unrepairable?. A transverse crack of any size. Any slag inclusions or cold shuts. Any repairs that would require shortening and re-contouring of blades.

What is the acceptable amount of cushion in a governor control lever?. 1/8 inch. 3/8 inch. 1/4 inch.

Rubber components should be stored in. the dark. natural light. flouresent light.

The maximum storage periods for installed propellers are detailed in the. propeller overhaul and repair manual. Airworthiness Notices. aircraft Maintenance Manual.

When storing wooden propellers. store in a dry well ventilated and illuminated location. store in a horizontal position. wrap in greaseproof paper.

A wooden propeller should be stored. a dry and well ventilated area. in a room with high humidity to stop it drying and cracking. a warm but light storeroom.

A wooden propeller in storage. should not be wrapped at-all. should be wrapped tightly. should be wrapped loosely.

A VP propeller mechanism, for storage for long periods should. should be completely emptied and dried. be filled with special inhibiting oil to prevent condensation and corrosion. be filled with the normal operating oil to prevent condensation and corrosion.