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58 Cards in this Set
- Front
- Back
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The intended
horizontal direction of travel |
Course
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The horizontal
direction of one terrestrial point from another |
Bearing
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The horizontal direction in which an
aircraft is pointed |
Heading
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The separation between two points
measured in some scaler quantity |
Distance
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Planes that pass through the earth
perpendicular to the earth’s rotational axis and intersect with the earth’s surface to form circles are known as |
parallels
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An irregular line
connecting points on a map of the earth, indicating line where a compass points to true north |
Agonic
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An irregular line
connecting points on a map of the earth, indicating where there is the same variation from true north |
Isogonic line
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The angular difference between the
directions of true north and magnetic north at a particular location |
Variation
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The angular difference between the direction of the earth's magnetic field and the compass reading due to nearby electromagnetic influences
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Deviation
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A line on a map that connects all
places having equal dip angles is known as an |
Isoclinic line
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The aircraft navigator is plotting
the present position by using aircraft course and speed, last known position, elapsed time, and any changes in speed and course since the last known position. What type of navigation is the navigator using? |
Dead Rekoning
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Accelerometers in inertial
navigation equipment are mounted on a platform that remains perpendicular to the earth’s gravitational field at all times to sense |
vehicle accelerations only
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A displacement gyro provides which
of the following electrical signals? |
Azimuth, pitch, and roll
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Roll signals to
the AFCS control amplifier |
Roll control transmitter
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Roll signals to
indicators |
Outer roll control transmitter
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Pitch signals to
the indicators |
Pitch servo control transmitter
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The directional gyro pitch gimbal is
maintained perpendicular to the surface of the earth by a motorgenerator that is driven by the amplified output of |
the vertical gyro’s pitch servo
control transmitter |
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The latitude degrees control on the
compass controller provides a signal to the directional gyroscope for compensation of |
apparent drift
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The two basic categories of
navigation are known as |
position fixing, and dead rekoning
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Dead reckoning is the process by which position is calculated from
what known data? inertial |
Course, speed, elapsed time, and
previous position |
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Every body continues its state of
rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it. This statement defines which of the following laws? |
Newton’s first law of motion
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Acceleration is proportional to the
resultant force and is in the same direction as that force. This statement defines which of the following laws? |
Newton’s second law of motion
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Which of the following statements
defines the terms velocity and acceleration? |
Velocity is a change in position,
and acceleration is a change in velocity |
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What are the two processes used in an
inertial navigation system (INS) to determine displacement? |
Detection and integration
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What quantity does an INS derive when
acceleration is integrated twice over a specific period of time? |
Displacement
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If the integral of acceleration with
respect to time is velocity, and the integral of velocity with respect to time is displacement, what is the double integral of acceleration with respect to time? |
Displacement
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The mathematical process of summing
all minute values of a variable function over a given time is known as |
integration
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When an object is undergoing a
change in velocity (either positive or negative), the object is being subjected to which of the following forces? |
Acceleration
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The gyros in the stable element are
used for what purpose? |
To provide stabilization signals
for the stabilized platform |
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Which of the following components of
the INS provides the primary data for the system? |
Accelerometer
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The stable element of an inertial
platform is isolated from the angular motion of the aircraft by being mounted on what aircraft part? |
Gimbals
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What means is used to stabilize the
stable element in the INS? |
Two two-degree-of-freedom gyros
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Any displacement of the stable
element from its frame of reference is detected by |
electrical pickoffs
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Aircraft heading and attitude
information is derived from the |
angular relationship of the
platform gimbals |
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What gyroscopic principle is used to
maintain the stable platform horizontal to the earth? |
Precession
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By what means is the stable element
maintained level to the earth during aircraft flight? |
By causing the gyros to precess
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Coriolis corrections are necessary in
an INS for which of the following reasons? |
The earth is a rotating reference
for the system |
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What accelerometer and gyro combinations
make up the north and east Schuler loops, respectively? |
North accelerometer and east
gyro; east accelerometer and north gyro |
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What process is eliminated by using
the calibrator set to calibrate an aircraft compass system? |
Rotating the aircraft on a
compass rose |
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What is the accuracy of the
electrical heading inputs provided by this calibrator test? |
0.1°
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Errors in the compass system are
measured as the difference between the aircraft’s magnetic heading, as indicated on the aircraft’s compass, and the magnetic heading of |
a simulated earth’s field
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A movable device attached to the
trailing edge of an airfoil increases lift by |
increasing the angle of attack
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What flight controls must be
coordinated when banking an aircraft? |
Elevators, ailerons, and rudder
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To compensate for an aircraft’s
continuous right yaw condition, the pilot should take which of the following actions? |
Move the rudder trim tab to the
right |
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What aileron control is necessary to
return the aircraft to laterally level flight from a right bank? |
The left aileron must go down,
and the right aileron must go up |
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The movement of the aircraft nose in
the opposite direction of an intended turn is caused by aileron drag and is known as |
adverse yaw
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Pitch and bank reference
information is furnished to the AFCS by a/an |
vertical gyro
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What is implied by the term
vertical gyro? |
The gyro’s spin axis is
continuously erected vertical to the surface of the earth |
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A rate gyro’s output is the result
of |
spin axis precession
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A rate gyro is mounted in a
flexible gimbal whose rotational freedom is restrained by a |
torsion-restoring spring
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What component of the AFCS corrects
the amount of control surface deflection due to changes in airspeed? |
An airspeed gain control unit
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In high-speed aircraft, which of the
following AFCS modes is considered to be most critical to safety of flight? |
STABILITY AUGMENTATION (STAB AUG)
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What mode of operation functions as
the basic hands-off mode of the AFCS? |
ATTITUDE HOLD
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What operational mode allows the
pilot to manually fly the aircraft without disengaging the AFCS? |
Control stick steering
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The primary purpose of the
stabilator control system is to stop which of the following attitudes |
Noseup
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The output voltage of the ASE
altitude controller is proportional to |
changes in barometric altitude
relative to a reference altitude |
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What effect does pressing the (a)
left and (b) right rudder pedals have on the rotary rudder thrust? |
(a) Increases (b) decreases
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What is the function of the ASE
rate gyros? |
To sense the helicopter’s rate
of turn and to produce a proportional ac output signal |
