Sift Study Guide Army Aviation Exam/40
Complete Questions & Answers
Which of these is one of the three types of drag that constitute total drag? -
-Parasite.
The force that resists the movement of a helicopter through the air and is
produced when lift is developed is called drag. Drag must be overcome by
the engine to turn the rotor. Drag always acts parallel to the relative wind.
Total drag is composed of three types of drag: Profile, induced, and parasite
-Which of the following is common to all turbine helicopters, but is only on
some piston powered helicopters? - -Governor
Governors are common on all turbine helicopters (as it is a function of the
fuel control system of the turbine engine), and used on some piston powered
helicopters
-Where is the horizontal reference datum located? - -It varies by helicopter
The horizontal reference datum is an imaginary vertical plane or point,
arbitrarily fixed somewhere along the longitude axis of the helicopter, from
which all horizontal distances are measured for wight and balance purposes.
there is no feed rule for its location. it is established by the helicopter
manufactureer
-The _______ position relative to the horizon determines the helicopters
travel and attitude - -Cyclic
The cyclic position relative to the horizon determines the helicopters travel
and attitude
-When training for a rapid deceleration, in most helicopters the entry speed
should be approximately? - -45 knots
Training maneuvers for rapid deceleration should always be don into the
wind. after leveling off at an altitude between 25-40 feet, depending upon
the manufacturers recommendations, accelerate to the desired entry speed,
which is approximately 45 knots for most training helicopters
-Which of the following has been the army primary training helicopter since
1993? - -BELL TH-67
, -Which of the following occurs when the tail rotor becomes more
aerodynamically efficient during the transition from hover to forward flight? -
-Translational thrust
Translational thrust occurs when the tail rotor becomes more
aerodynamically effiencent during the transition from however to froward
flight. as the tail rotor works in progressively less turbulent air, this improved
effiency produces more anti torque thrust, causing the nose of the aircraft to
yaw left (with a main rotor turning counterclockwise) and foes the pilot to
apply the right pedal (decreasing the AOA in the tail rotor blades) in respons
-The solidity ration is the: - -Ration of the TOTAL ROTOR BLADE AREA to the
TOTAL ROTOR DISK AREA
The solidity ration is the ratio of the total blade area, which is the combined
area of all the main motor blades, to the toal rotor disk area. this ration
provides a means to measure the potential for a rotor system to provide
thrust and lift.
-Which of the following is not one of the controls used by a helicopter pilot
during flight? - -Torque Pedals
There are three major controls in a helicopter that the pilot must use during
flight. They are the collective pitch control, the cyclic pitch control, and the
anti torque pedals or tail rotor control. In addition to these major controls,
the pilot must also use the throttle control, which is usually mounted directly
to the collective pitch control in order to fly the helicopter
-Each gallon of reciprocating engine oil weighs ____ lbs - -7.5
-TO maintain airspeed in a 2G 60 degree turn, rotor thrust/ engine must
increase by ___ percent - -100
In steep turns, the nose drops. in most cases, energy (airspeed) must be
traded to maintain altitude as the required excess engine power may not be
available (to maintain airspeed in a 2g/ 60 degree turn, rotor thrust/ engine
power must increase by 100 percent)
-A high reconnaissance should be flown at an altitude of ___ to ___ fleet
above the durvace - -300 to 500
It is important to strike a balance between a reconnaissance conducted too
high and one too low. it should not be flown so low that a pilot must divide
attention between studying the area and avoiding obstructions to flight. A
high reconnaissance should be flown at an altitude of 300 to 500 feet above
the surface.
Complete Questions & Answers
Which of these is one of the three types of drag that constitute total drag? -
-Parasite.
The force that resists the movement of a helicopter through the air and is
produced when lift is developed is called drag. Drag must be overcome by
the engine to turn the rotor. Drag always acts parallel to the relative wind.
Total drag is composed of three types of drag: Profile, induced, and parasite
-Which of the following is common to all turbine helicopters, but is only on
some piston powered helicopters? - -Governor
Governors are common on all turbine helicopters (as it is a function of the
fuel control system of the turbine engine), and used on some piston powered
helicopters
-Where is the horizontal reference datum located? - -It varies by helicopter
The horizontal reference datum is an imaginary vertical plane or point,
arbitrarily fixed somewhere along the longitude axis of the helicopter, from
which all horizontal distances are measured for wight and balance purposes.
there is no feed rule for its location. it is established by the helicopter
manufactureer
-The _______ position relative to the horizon determines the helicopters
travel and attitude - -Cyclic
The cyclic position relative to the horizon determines the helicopters travel
and attitude
-When training for a rapid deceleration, in most helicopters the entry speed
should be approximately? - -45 knots
Training maneuvers for rapid deceleration should always be don into the
wind. after leveling off at an altitude between 25-40 feet, depending upon
the manufacturers recommendations, accelerate to the desired entry speed,
which is approximately 45 knots for most training helicopters
-Which of the following has been the army primary training helicopter since
1993? - -BELL TH-67
, -Which of the following occurs when the tail rotor becomes more
aerodynamically efficient during the transition from hover to forward flight? -
-Translational thrust
Translational thrust occurs when the tail rotor becomes more
aerodynamically effiencent during the transition from however to froward
flight. as the tail rotor works in progressively less turbulent air, this improved
effiency produces more anti torque thrust, causing the nose of the aircraft to
yaw left (with a main rotor turning counterclockwise) and foes the pilot to
apply the right pedal (decreasing the AOA in the tail rotor blades) in respons
-The solidity ration is the: - -Ration of the TOTAL ROTOR BLADE AREA to the
TOTAL ROTOR DISK AREA
The solidity ration is the ratio of the total blade area, which is the combined
area of all the main motor blades, to the toal rotor disk area. this ration
provides a means to measure the potential for a rotor system to provide
thrust and lift.
-Which of the following is not one of the controls used by a helicopter pilot
during flight? - -Torque Pedals
There are three major controls in a helicopter that the pilot must use during
flight. They are the collective pitch control, the cyclic pitch control, and the
anti torque pedals or tail rotor control. In addition to these major controls,
the pilot must also use the throttle control, which is usually mounted directly
to the collective pitch control in order to fly the helicopter
-Each gallon of reciprocating engine oil weighs ____ lbs - -7.5
-TO maintain airspeed in a 2G 60 degree turn, rotor thrust/ engine must
increase by ___ percent - -100
In steep turns, the nose drops. in most cases, energy (airspeed) must be
traded to maintain altitude as the required excess engine power may not be
available (to maintain airspeed in a 2g/ 60 degree turn, rotor thrust/ engine
power must increase by 100 percent)
-A high reconnaissance should be flown at an altitude of ___ to ___ fleet
above the durvace - -300 to 500
It is important to strike a balance between a reconnaissance conducted too
high and one too low. it should not be flown so low that a pilot must divide
attention between studying the area and avoiding obstructions to flight. A
high reconnaissance should be flown at an altitude of 300 to 500 feet above
the surface.
