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wind. Drift must be corrected for by heading the aircraft slightly into the direction from which the wind is
blowing.
drift angle (aircraft flight). The angular difference between the direction an aircraft is headed in flight and
the direction it actually moves over the ground.
drifting snow (meteorology). Snow particles picked up from the surface by the wind and carried to a
height of less than six feet.
drift magnet (electrical instrument component). A small permanent magnet used in some electrical
indicating instruments to pull the instrument pointer off the scale when the instrument is not energized.
drift punch. A pin punch with a long straight shank and a flat end. A drift punch is used to drive a shaft out
of its hole.
drift sight (aircraft navigation instrument). A navigational instrument used in an aircraft when it is being
navigated by dead reckoning. The drift sight measures the angle between the direction the aircraft is
pointed and the direction it is moving over the ground.
drill (rotary cutting tool). A pointed rotary cutting tool rotated under pressure in a drill press or with a
hand-held drill motor to cut a hole in a piece of solid material. A drill is correctly called a twist drill.
drill bushing. A hardened steel bushing installed in an assembly fixture. A piece of metal to be assembled
is clamped in the fixture, and a twist drill is guided by the bushing to drill a hole at the correct location. The
hardened metal prevents the bushing being worn by the drill.
drill chuck (machine tool component). A three-jaw clamp attached to the spindle of a drill press or the
shaft of a drill motor to hold a twist drill centered. The jaws of the chuck may be tightened on the drill with
a chuck key or Allen wrench, and some chucks are designed to be tightened by hand.
drill motor. An electric or pneumatic motor that drives a chuck which holds a twist drill.
The best drill motors produce high torque, and their speed can be controlled.
drill press. A power tool used for drilling holes in metal or wood.
The drill press consists of a motor-driven spindle on which is mounted a drill chuck that holds a
twist drill.
The material to be drilled is placed on a steel table under the spindle, and the spindle is forced
down, causing the drill to cut into the material.
drill rod (metallurgy). A rod of steel having a carbon content of at least 0.85%.
drip loop (electrical wiring). A half loop of wire at the cable entrance of an exposed junction box. The
final section of the cable runs upward, preventing water entering the box.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 204
drip pan. A shallow metal pan placed under the engine of an aircraft when it is in the hangar to catch any
oil that might drip from it.
drip-stick fuel gage (fuel quantity indicator). A type of visual fuel-quantity indicator used on large
aircraft to measure the amount of fuel in a tank. The drip stick, which is normally locked in the tank in its
up position, is unlocked and slowly pulled down from the bottom of the tank. The bottom of the drip stick
is watched until the first drips of fuel come from it. At this point, the top of the drip stick is level with the
top of the fuel in the tank.
Marks on the outside of the drip stick at the point it leaves the tank show the amount of fuel in the
tank.
drive coupling (engine component). A shock-absorbing coupling used between the accessory drive in an
engine and an accessory that is subject to torsional vibrations.
A safety link designed to shear if the accessory should freeze, or jam, is usually incorporated as a
part of a drive coupling.
drive fit (mechanical fit). A tight fit between mating parts of a mechanism in which one part fits inside
another. In a drive fit, the hole is smaller than the part that fits into it, and force must be used to assemble
the parts. A drive fit is also called an interference fit.
drive gear. The gear attached to the power source in a gear train. The drive gear meshes with and drives
the driven gear. If the drive gear is smaller than the driven gear, the driven gear turns slower than the drive
gear.
driven gear. The gear in a gear train that meshes with and is driven by the drive gear.
driver (electronic circuit). A piece of electronic equipment in a circuit that supplies input power to an
output circuit or device.
driver head (threaded fastener). A type of bolt or screw head that is either slotted or fitted with a recess.
A driver head makes it possible to drive the fastener with some form of screwdriver, rather than with a
wrench.
drivescrew. A form of self-tapping screw that has no screwdriver slot nor recess in its head. Drivescrews
are used to attach nameplates to an engine crankcase and to plug holes in a tubular steel structure through
　
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