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the aircraft, the time used for its travel to the ground station and back is converted into terms of nautical
miles to the station. DME is a portion of the military TACAN (Tactical Air Navigation) system.
DME fix. A geographic location determined by reference to a navigational aid which provides distance and
azimuth information. The direction of a DME fix is specified in degrees magnetic from the facility, and the
distance from the facility is given in nautical miles.
DME separation. Air traffic control spacing of aircraft in terms of nautical miles as determined by
reference to distance measuring equipment.
dock (aircraft maintenance facility). An area in which the proper scaffolds and work platforms can be put
around an aircraft so it can be inspected or repairs can be made.
DOD (domestic object damage). Damage to the components in the gas path of a turbine engine caused by
the failure of parts within the engine itself.
DOD FLIP (Department of Defense Flight Information Publication). A publication put out by the
Department of Defense and used for flight planning, en route, and terminal operations.
doghouse (mark on a turn and slip indicator dial). A mark on the dial of a four-minute turn and slip
indicator that has the shape of a doghouse.
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The inside edge of the doghouse is located one needle width away from the edge of the center
reference mark on the dial, so a turn in which the needle aligns with the doghouse, a two-needle-width turn,
is a standard rate, three degrees per second, turn. A one-needle-width turn on a turn and slip indicator
which has doghouses on the dial is a four minute, or 1 1/2-degree-per-second turn.
dog point (threaded fastener). The point of a threaded fastener cut in the form of a cylinder. The length of
the dog point is about one half of the diameter of the bolt, and its diameter is slightly less than the diameter
of the bolt at the bottom of the threads. A dog point is used as a pilot, or guide, when assembling parts.
doldrums (meteorology). The equatorial belt of calm or light and variable winds between the two
tradewind belts.
dolly (shop tool). Any of several types of wheeled platforms used in a maintenance shop to move or store
heavy aircraft or engine components.
dolly block (sheet metalworking tool). A hardened steel block having a smooth, curved surface. Dolly
blocks are used to back up a mallet when hand-forming sheet metal into compound curves.
domain (magnetic term). Clumps of molecules in a piece of ferromagnetic material that change their
magnetic alignment as a group, rather than as individual molecules.
domestic airspace (air traffic control). Airspace which overlies the continental land mass of the United
States plus Hawaii and U.S. possessions. Domestic airspace extends to 12 miles offshore.
domestic object damage. See DOD.
donor atom (semiconductor material). Atoms of pentavalent elements (elements having five valence
electrons) used to dope silicon or germanium for making semiconductor diodes or transistors.
A donor atom has more electrons than needed for the covalent bonds within the material and
donates these extra electrons to acceptor atoms.
donor impurity (semiconductor component). Any of the chemical elements with five valence electrons
used to dope silicon or germanium to produce N-type semiconductor material. Phosphorus, arsenic, and
antimony are commonly used as donor impurities.
dope (aircraft finishing material). A finishing material used to shrink cotton or linen fabric and make it
airtight and weatherproof. Dope is made of a cellulose film base mixed with suitable solvents, thinners, and
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plasticizers.
doped-in panel (aircraft fabric repair). A repair made to a fabric-covered aircraft wing in which an entire
panel of fabric from the leading edge to the trailing edge, between one or more ribs, is replaced. The new
fabric is attached to the old fabric by doping it in place, rather than sewing it in, but it is attached to the
structure by rib stitching.
doped-on fabric repair. A repair to a small damaged area in an aircraft fabric covering in which the patch
is doped to the old fabric, rather than sewed in place.
dope proofing (aircraft finishing procedure). The treatment of a structure to be covered with fabric to
keep the solvents in the dope from softening the protective coating on the structure.
dope-proof paint (aircraft finishing material). A type of finish applied over a varnished surface to be
covered with fabric and doped. The dope-proof paint prevents the solvents in the dope from softening the
　
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