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31 Cards in this Set

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What produces the lift required for helicopter flight?
Rotor blades.
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?
It is symmetrical.
What determines the amount of lift generated by a helicopter’s rotor?
The lift of a rotor is proportional to the square of the length of the rotor blades.
What is the result of highly polished rotor blades?
Parasite drag is reduced.
Where is density altitude at its greatest?
At sea level.
On a single main rotor helicopter, the tail rotor is used to counteract what force?
Torque.
Other than horizontal flight, how is rotor blade dissymmetry created?
By the wind when the helicopter is hovering.
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?
Articulated rotor.
The upward bending of rotor blades is known by what term?
Coning.
When a helicopter is close to the ground, will it require more or less power to maintain a hover?
Less.
What term refers to main rotor rotation caused by air passing through the main rotor blades instead of being powered by the engine?
Autorotation.
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?
Power settling.
What is the most common type of helicopter?
Single main rotor with vertical or near vertical tail rotor.
The CH-46 multirotor helicopter has what type of rotor design?
Tandem rotor system.
What feature provides the single rotor configuration with excellent directional control?
The vertical tail rotor.
In what direction does a tandem rotor operate that results in little torque?
Tandem rotors operate in opposite directions.
What pitch control system provides lateral helicopter movement?
Cyclic pitch control system.
What pitch control system provides vertical helicopter movement?
Collective pitch control system.
What does the rotary rudder system control?
Directional heading.
On the rotary rudder control system, what component is preloaded to 600 pounds and considered hazardous to personnel?
The negative force gradient spring.
How many separate banks of servomechanisms make up the auxiliary servo cylinder?
Four (4).
What component controls and transfers independent movements of the lateral, forward, aft, and directional controls?
Mixing unit.
The movement of what valve allows hydraulic fluid flow in the three primary servo cylinders?
Pilot valve.
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?
The swashplate assembly.
What test is required after a helicopter has been rigged?
A flight test.
Proper blade tracking prevents what condition?
Vibrations.
What blade-tracking device can be used in flight or on the ground?
The Strobes blade tracker.
What assembly is comparable to a single disc wheel brake in its design and operation?
A rotor brake assembly.
What component prevents hydraulic pressure from entering the blade fold system during flight?
Safety valve.
What is the blade fold accumulator nitrogen preload pressure that maintains hydraulic pressure in the rotary-wing head?
1,500-psi nitrogen pressure.
Before you charge the blade fold accumulator with nitrogen, the blades should be in what position?
Spread position.