drift

drift
i. The lateral divergence from the prescribed flight path of an aircraft resulting primarily from the effects of a cross-wind.
ii. A slow movement in one direction of an instrument pointer or other marker.
iii. A slow change in frequency of a radio transmitter.
iv. The angular deviation of the spin axis of a gyro from a fixed reference in space.
v. The angular deviation of a heading indicator of a gyrocompass resulting from either real or apparent precession. See apparent drift.
vi. The movement of a parachutist downwind.
vii. In ballistics, a shift in projectile direction caused by a gyroscopic action that results from gravitational and atmospherically induced torque or the earth’s rotation.
viii. The failure of photo-graph(s) to stay on the predetermined flight line. If the drifting is excessive, repeated flights will have to be made because of serious gaps between adjacent flight lines.
The pilot initially allows for drift by flying a selected course to enable him to follow the desired track. After flying on this course if he finds that he has drifted, he makes a drift correction to regain the desired track.

Aviation dictionary. 2014.

Синонимы:

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