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Sift heli knowledge
Terms in this set (40)
What part of a rotary-wing aircraft makes directional controls possible
Which of these us army helicopters is classified as tandem rotor
What is the preferred method of ground movement for helicopters on airports
Which war became known as the "helicopter war" because helicopters, in their first large-scale use in combat operations,quickly became a decisive force-multiplier for United started forces?
What type of helicopter design uses a ducted fan in place of a tail rotor to cancel torque effect
Which aerodynamic force(s) must a rotary-wing aircraft balance in order to over?
How would a high density altitude affect the performance of a helicopter
Performance would be decreased due to low value of the air density
If the airspeed indicator needle is in the yellow and approaching the red line during a maneuver, what would be the correct response?
Which pitot-static instrument makes use of both pitot and static pressure?
What effect does the cyclic control have on the rotor system?
It alters the pitch of the main rotor blades individually and cyclically
The angle of attack is the angle between the
Airfoil chord line and the resultant relative wind
What item was developed to reduce compass reading errors?
A vertical card compass
What effect is principally used to counteract main rotor torque with the NOTAR system used on the MD520n and MD900 helicopters?
Which type of drag is caused by production of lift?
Risk management is composed of which four risk elements?
Pilot, aircraft, environment, and external pressures
What is the unit of measure for airspeed?
What is the degree increment between the hash marks on the attitude indicator?
What three conditions are necessary for a helicopter to be in danger of a dynamic rollover?
Pivot point, rolling motion, and exceeding critical angle
What are the three regions of a rotor in autorotation
Driven, driving, and stall
Empennage refers to the
What is resultant relative wind?
Rotational relative wind modified by induced flow
The atmospheric pressure on the top surface of an airfoil decreases as the velocity of the air moving past it increases. This is an example of
When entering and exiting class C controlled airspace, which statement is true regarding airspace clearance?
The ATC must acknowledge the pilot by responding with the aircraft's call sign for communication to be considered established
Which is true of helicopter performance in ground effect?
The rotor system becomes more efficient since the ground interferes with the circulation pattern, and less power is required to hover
Which term is used to describe the weight of and aircraft, including all hydraulic and oil systems, full, trapped and unusable fuel, and all fixed equipment?
Basic weight or basic empty weight
What aerodynamic condition can occur when a helicopter is descending at greater than 300 fpm, has 20 to 100 percent power applied, and an airspeed less then effective translational lift?
Settling with power
What one of the acronyms for all-up weight is defined as the total aircraft weight at any given moment during flight?
AGW , aircraft gross weight
How would a pilot recognize the onset of transverse flow effect?
During takeoff, a vibration and a right rolling motion occurs as the aircraft accelerates through 10-20 knots
If magnetic north is a positive 15-degree variation (west) from true north, to convert true north to magnetic north when flying eastbound, what is the adjustment a pilot must make to the magnetic compass?
Add 15 degrees
As air becomes less dense l, it causes the following change in force:
A reduction in power at the engine intakes
When an aircraft is approaching to land, the leading and trailing edges of it flaps are extended to create to create the following force(s)
Maximum lift and high drag
If there is no increase in thrust, which action would result in an ultimate stall?
What causes a rotary-wing aircraft to drift laterally due to tail rotor thrust?
Which aircraft component affect yaw?
What flight control maintains the engine within optimal flight parameters
What gives the pilot control over the yaw axis of the aircraft?
The tail rotor pedals
Which ATC ( air traffic control) radio transmission permits entry into class C airspace for N4227HC
Helicopter 4227HC, standby
Which instrument indicates if an aircraft is in a climb, in a decent , or in level flight?
A vertical speed indicator
Which type of climb produces the most altitude in a given distance?
Best angle of climb
When raised elevators push down on the tail of an aircraft, what effect does that have on the aircraft
The nose of the aircraft rises
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