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31 Cards in this Set
- Front
- Back
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What produces the lift required for helicopter flight?
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rotor blades
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When the camber is the same on both surfaces of an airfoil and results in a fixed center of pressure, what term describes the helicopter airfoil?
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it is symmetrical
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What determines the amount of lift generated by a helicopter's rotor?
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the lift of a rotor is proportional to the square of the length of the rotor blades
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What is the result of highly polished rotor blades?
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parasite drag is reduced
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Where is the density altitude at its greatest?
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at sea level
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On a single main rotor helicopter, the tail rotor is used to counteract what force?
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torque
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Other than horizontal flight, how is rotor blade dissymmetry created?
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by the wind when the helicopter is hovering
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What type of main rotor allows individual rotor blades to move in both a vertical and horizontal plane to reduce vibration caused by blade flapping?
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articulated rotor
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The upward bending of rotor blades is known by what term?
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coning
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When a helicopter is close to the ground, will it require more or less power to maintain a hover?
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less
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What term refers to main rotor rotation caused by air passing through the main rotor blades instead of being powered by the engine?
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autorotation
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What term describes the effect that occurs when a helicopter experiences an uncontrollable loss of altitude because of a combination of heavy gross weight, poor density conditions, and low forward speed?
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power settling
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What is the most common type of helicopter?
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ingle main rotor with vertical or near vertical tail rotor
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The CH-46 multirotor helicopter has what type of rotor design?
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tandem rotor system
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What feature provides the single rotor configuration with excellent directional control?
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the vertical tail rotor
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In what directoin does a tandem rotor operate that results in little torque?
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tandem rotors operate in opposite directions
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What pitch control system provides lateral helicopter movement?
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cyclic pitch control system
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What pitch control system provides vertical helicopter movement?
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collective pitch control system
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What does the rotary rudder system control?
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directional heading
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On the rotary rudder control system, what component is preloaded to 600 pounds and considered hazardous to personnel?
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the negative force gradient spring
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How many separate banks of servomechanisms make up the auxiliary servo cylinder?
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four
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What component controls and transfers independent movements of the lateral, forward, aft, and directional controls?
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mixing unit
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The movement of what valve allows hydraulic fluid flow in the three primary servo cylinders?
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pilot valve
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What unit sends movement, through the adjustable pitch control rods, to the sleeve and spindle assembly of the rotary blades to change the angle of incidence of the blades?
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the swashplate assembly
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What test is required after a helicopter has been rigged?
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a flight test
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Proper blade tracking prevents what condition?
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vibrations
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What blade-tracking device cab be used in flight or on the ground?
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the strobes blade tracker
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What assembly is comparable to a single disc wheel brake in its design and operation?
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a rotor brake assembly
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What component prevents hydraulic pressure from entering the blade fold system during flight?
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safety valve
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What is the blade fold accumulator nitrogen preload pressure that maintains hydraulic pressure in the rotary-wing head?
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1,500-psi nitrogen pressure
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Before you charge the blade fold accumulator with nitrogen, the blades should be in what position?
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spread position
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