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Question 52-1 : Rotor brakes are often located ? [ Test maintenance ]
On the tail rotor drive shaft
Question 52-2 : Rotor brake discs are manufactured from ?
Steel or carbon fibre.
Alumicnium or steel. steel or titanium. boron aluminide or titanium.
Question 52-3 : Wear rate of a control rod spherical bearing is ?
Exponential.
Progressive. constant. unpredictable.
Question 52-4 : The purpose of the fixed scissors is to ?
Resist the rotational force applied to the lower swashplate in a rotorhead system.
Ensure the wheel remains correctly orientated to the oleo leg in a landing gear. act as the lower jaw of the cable cut device on a hoist. provide part of feedback mechanism in an auto-pilot system.
Question 52-5 : Tail rotors differ from most main rotors in that ?
The pitch changes from a negative angle setting to a positive angle setting.
The tail rotor rotates at a lower speed. they always have few blades. the lead/lag hinge is incorporated with the flapping hinge.
Question 52-6 : Tail rotors differ from main rotors in that ?
They do not provide for blade pitch cyclic variation.
Pitch remains constant throughout all flight regimes. they rotate at a lower speed. they always have fewer blades.
Question 52-7 : Main rotor droop stops ?
Are inactive during flight.
Move to prevent the rotor disc drooping excessively during turbulent conditions preventing damage to the tail cone in flight. prevents rotor droop in flight by ensuring the engine provides additional power immediately when required by the rotor. prevents engine power reducing below the requirements to sustain rotor rpm.
Question 52-8 : An unshrouded tail rotor has ?
Equal pitch change to all blades.
Question 52-9 : On the diagram the rotating blade pitch control is indicated by the letter 2436 ?
D.
A. b. c.
Question 52-10 : What is a typical characteristic of a fully articulated rotor system ?
The blades are free to flap drag and feather independently of one another.
Question 52-11 : Which of the following statements with respect to the rotor brake is correct ?
The rotor brake is nearly always implemented as a disc brake.
The rotor brake is nearly always implemented as a drum brake. the rotor brake always slows down the drive shaft between the engine(s) and the main gear box. a hydraulically actuated rotor brake is connected to the same hydraulic system as the flight controls, in order to ensure the necessary reliability.
Question 52-12 : A rotor is fully articulated when ?
The blades each have the possibility to flap drag and feather separately.
The rotor head has hinges for flapping as well as dragging. the blades have been mounted flexibly with regard to flapping and dragging. the rotor has more than two blades that have separate flapping and feathering hinges.
Question 52-13 : The chord length of the blades of a ducted tail rotor fenestron is ?
Smaller than that of a classic tail rotor.
The same as that of a classic tail rotor. greater than that of a classic tail rotor. depends on the type of material used.
Question 52-14 : An elastomeric bearing flapping hinge in the rotor head ?
Contributes to a reduced maintenance effort.
Allows larger blade flapping angles. allows for larger forward speeds. is utilised to absorb the loads on the rotor blades arising from vertical gusts.
Question 52-15 : What are elastomeric bearing hinges in a rotor head ?
Flexible sections accomplishing the functions of flapping dragging and feathering hinges.
Self-lubricating hinges. bending plastic parts. rubber flapping and dragging hinges.
Question 52-16 : Intermediate or angle gearboxes are used to ?
Change the direction and sometimes the speed of the tail rotor drive.
Change the direction of the tail rotor drive only. change the speed of the tail rotor drive only. mount the tail rotor.
Question 52-17 : To engage the main rotor drive prior to flight on a helicopter fitted with a centrifugal clutch the pilot should ?
Smoothly accelerate the engine with rotor brake selected off.
Accelerate the engine above rotor speed, decelerate the engine, then accelerate again until engine and rotor speeds are matched. de-select the free wheel and engage drive. accelerate the engine until engine and rotor speed are equal then engage the clutch using either a mechanical lever or an electrical switch.
Question 52-18 : The tail rotor gearbox changes direction of drive ?
Through 90° reduces rotational speed and provides facilities for tail rotor control.
Img2761the antitorque rotor tail rotor is driven from the transmission the antitorque rotor produces thrust to oppose torque and helps prevent the helicopter from turning in the opposite direction of the main rotorThrough minus 90° and increases rotational speed. and increases rotational speed. and provides facilities for tail rotor control maintaining a constant speed.
Question 52-19 : The purpose of a clutch in a helicopter transmission system is to ?
Permit the engine to be started with a low inertial loading.
Permit the rotor to rotate freely during autorotation. prevent the rotor turning in the wind when parked on the ground. disengage the tail rotor drive in the event of a malfunction.
Question 52-20 : Rotational drive from the gearbox to the rotorhead is transmitted by the ?
Main drive shaft.
Scissors. swashplate assembly. pitch change arms.
Question 52-21 : Intermediate or angle gearboxes are used to ?
Change the direction and speed of the tail rotor drive.
Change the direction only of the tail rotor drive. change the speed only of the tail rotor drive. allow the incorporation of autopilot inputs into the tail rotor.
Question 52-22 : In a free turbine helicopter installation ?
There is no need for a clutch between the engine and the transmission.
A free-wheel is required between the compressor and the turbine. the main rotor drive and the compressor are on a common shaft. there must be a clutch between the engine and transmission.
Question 52-23 : Helicopters which utilise a ''v' belt to transmit the drive from the engine to the transmission also incorporate ''belt tighteners'' these belt tighteners serve as ?
A manual clutch.
An automatic system to ensure belt tension remains constant irrespective of temperature. a means by which the engineer can set the belt tension. an automatic clutch.
Question 52-24 : Freewheel units between engine and main rotor gearbox are in most cases lubricated from ?
The main rotor gearbox lubrication system.
The engine lubrication system. an independent lubrication system driven by the main rotor gearbox. an independent system driven by either the engine or an electrically driven pump.
Question 52-25 : For a free power turbine engine ?
The turbine driving the main rotor transmission is mechanically independent from the gas generator.
The compressor driving the main transmission is mechanically independent from the power turbine. the gas generator is free to run at a constant speed while the power turbine changes speed in response to changes in drag on the main rotor blades. pilot control of the engine is limited to the selection of off, ground idle and flight, leaving the engine to automatically respond to rotor demands.
Question 52-26 : Clutches are located in the drive between the engine and the main transmission on ?
Helicopters with piston or direct drive gas turbine engines.
All helicopters. helicopters fitted with piston engines only. helicopters with free power turbine engines only.
Question 52-27 : A tail rotor drive shaft running between two engines should be ?
Protected by a firewall.
Mounted to allow for expansion. mounted on its own bearing hangers, the first being directly behind the main rotor gearbox. protected by the engine fire extinguishing system.
Question 52-28 : What is the purpose of the freewheel unit in the rotor drive system ?
To disconnect the failed engine from the main and tail rotor drive.
To enable the rotor to rotate freely for autorotation. to be able to start the engine(s) without starting to turn the rotor to be able to disconnect the main rotor from the drive system when the engine fails.
Question 52-29 : Does the freewheel unit is necessary for helicopter with free turbine engine ?
Yes.
No, not with new generation engines. yes, but only for multi-engined helicopters. no.
Question 52-30 : A snatch engagement of a freewheel unit ?
May result in the shearing of the engine drive shaft.
Is normal engagement. is absorbed by flexible couplings on the engine drive shaft. will cause the freewheel to ratchet until the pilot recovers the situation.
Question 52-31 : A mercury clutch ?
Utilises the weight of the mercury to provide the centrifugal force to act on the clutch shoes.
Is not used in helicopters due to the danger of mercury contamination of aluminium. uses the liquid mercury as a hydraulic fluid. is not used in helicopters due to the high weight of mercury.
Question 52-32 : The input and output speeds of an intermediate gearbox ?
Differ to counter the effects of vibration.
Differ to establish the speed for the tail rotor. are the same. are variable to provide varying thrust from the tail rotor to counteract torque loads from the main rotor system.
Question 52-33 : Tail rotors rotate ?
At a greater speed than the main rotor and at a different speed than the drive shaft and intermediate gearbox.
At the same speed as the shafts and gear boxes. at a greater speed than the main rotor and the tail rotor drive shafts. at a lower speed than the main rotor.
Question 52-34 : Why are one or more flexible couplings usually incorporated in the tail rotor drive shafts ?
To absorb the angular differences arising from bending of the tail.
To absorb quick power changes. to prevent vibrations. to prevent torsion of the shafts.
Question 52-35 : Metal tail rotor drive shafts are normally manufactured from ?
Aluminium or steel tubing.
Aluminium tubing only. steel bar. titanium and steel tubing.
Question 52-36 : On the diagram the flapping hinge is indicated by number ?
1.
2. 3. 4.
Question 52-37 : When using a strobe type tracking and balancing system on a fully articulated rotor head one blade is not equidistant from the other blades in the lateral plane the cause of this defect is that ?
The blade damper on the subject blade is not functioning correctly.
The blade rigging is out of adjustment. the pitch change rod is not correctly adjusted. the blade trim tabs are not correctly adjusted.
Question 52-38 : What indication will be available to the pilot of wear in either tail rotor gimbal or pitch change link bearings ?
Vibration through the tail rotoryaw pedals.
Stiffness in the tail rotor controls. instability in pitch control. loud noise from the tail rotor.
Question 52-39 : On the diagram the leadlag hinge is indicated by number 2429 ?
2.
1. 3. 4.
Question 52-40 : On the diagram the pitch hinge is indicated by number 2429 ?
3.
2. 1. 4.
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