AFAST HELICOPTER KNOWLEDGE SECTION
QUESTIONS AND ANSWERS
A lighted heliport may be identified by
(A) a flashing yellow light.
(B) a blue lighted square landing area.
(C) white and red lights.
(D) a green, yellow, and white rotating beacon.
(E) blue and red alternating flashes. - ANSWER The correct answer is (D).
The color combination of
green, yellow, and white flashed by beacons indicates
a lighted heliport.
The primary purpose of the tail rotor system is to
(A) assist in making a coordinated turn.
(B) maintain heading during forward flight.
(C) counteract the torque effect of the main rotor.
(D) provide additional thrust and lift.
(E) increase maximum speed. - ANSWER The correct answer is (C). The
auxiliary or tail rotor
is the anti-torque rotor that produces thrust in the
direction opposite to the torque reaction developed by
the main rotor.
During a hover, a helicopter tends to drift in the
direction of tail rotor thrust. This movement is called
(A) flapping.
(B) gyroscopic precession.
(C) transverse flow effect.
(D) translating tendency.
(E) Coriolis force. - ANSWER The correct answer is (D). The entire helicopter
has
a tendency to move in the direction of tail rotor thrust
when hovering. This movement is generally referred
to as translating tendency or drift.
, The upward bending of the rotor blades resulting
from the combined forces of lift and centrifugal force
is known as
(A) translational lift.
(B) blade flapping.
(C) Coriolis effect.
(D) dissymmetry of lift.
(E) coning. - ANSWER The correct answer is (E). The upward bending of
the rotor blades caused by the combined forces of lift
and centrifugal force is called coning.
In a helicopter, the center of gravity (CG) range is
usually located
(A) in front of the main rotor mast.
(B) in the rear of the main rotor mast.
(C) directly above the main fuel tank.
(D) directly below the main fuel tank.
(E) a short distance fore and aft of the main
rotor mast. - ANSWER The correct answer is (E). The exact location and
length of the CG range is specified for each
helicopter, but it usually extends a short distance fore
and aft of the main rotor mast.
The lift differential that exists between the advancing
main rotor blade and the retreating main rotor blade
is known as
(A) Coriolis effect.
(B) dissymmetry of lift.
(C) translating tendency.
(D) translational lift.
(E) lift vector. - ANSWER The correct answer is (B). Dissymmetry of lift is
created by horizontal flight or by wind during
hovering flight. It is the difference in lift (unequal
lift) across the rotor disc resulting from the difference
in the velocity of air over the advancing blade half of
the disc area and retreating blade half of the disc area.
Ground resonance is most likely to develop when
QUESTIONS AND ANSWERS
A lighted heliport may be identified by
(A) a flashing yellow light.
(B) a blue lighted square landing area.
(C) white and red lights.
(D) a green, yellow, and white rotating beacon.
(E) blue and red alternating flashes. - ANSWER The correct answer is (D).
The color combination of
green, yellow, and white flashed by beacons indicates
a lighted heliport.
The primary purpose of the tail rotor system is to
(A) assist in making a coordinated turn.
(B) maintain heading during forward flight.
(C) counteract the torque effect of the main rotor.
(D) provide additional thrust and lift.
(E) increase maximum speed. - ANSWER The correct answer is (C). The
auxiliary or tail rotor
is the anti-torque rotor that produces thrust in the
direction opposite to the torque reaction developed by
the main rotor.
During a hover, a helicopter tends to drift in the
direction of tail rotor thrust. This movement is called
(A) flapping.
(B) gyroscopic precession.
(C) transverse flow effect.
(D) translating tendency.
(E) Coriolis force. - ANSWER The correct answer is (D). The entire helicopter
has
a tendency to move in the direction of tail rotor thrust
when hovering. This movement is generally referred
to as translating tendency or drift.
, The upward bending of the rotor blades resulting
from the combined forces of lift and centrifugal force
is known as
(A) translational lift.
(B) blade flapping.
(C) Coriolis effect.
(D) dissymmetry of lift.
(E) coning. - ANSWER The correct answer is (E). The upward bending of
the rotor blades caused by the combined forces of lift
and centrifugal force is called coning.
In a helicopter, the center of gravity (CG) range is
usually located
(A) in front of the main rotor mast.
(B) in the rear of the main rotor mast.
(C) directly above the main fuel tank.
(D) directly below the main fuel tank.
(E) a short distance fore and aft of the main
rotor mast. - ANSWER The correct answer is (E). The exact location and
length of the CG range is specified for each
helicopter, but it usually extends a short distance fore
and aft of the main rotor mast.
The lift differential that exists between the advancing
main rotor blade and the retreating main rotor blade
is known as
(A) Coriolis effect.
(B) dissymmetry of lift.
(C) translating tendency.
(D) translational lift.
(E) lift vector. - ANSWER The correct answer is (B). Dissymmetry of lift is
created by horizontal flight or by wind during
hovering flight. It is the difference in lift (unequal
lift) across the rotor disc resulting from the difference
in the velocity of air over the advancing blade half of
the disc area and retreating blade half of the disc area.
Ground resonance is most likely to develop when
