the Aviation Dictionary

divergence - In meteorology, the condition that exists
when the distribution of winds within a given area is
such that there is a net horizontal flow of air outward
from the region. The opposite of convergence.
divergent duct - A cone-shaped passage or channel in
which a gas can be forced to flow from its smallest area
to its largest area resulting in decreased velocity and
increased pressure.
diverse vector area - In a radar environment, that area
in which a prescribed departure route is not required as
the only suitable route to avoid obstacles. The area in
which random radar vectors below the MVAIMIA,
established in accordance with the TERPS criteria for
diverse departures obstacles and terrain avoidance, may
be issued to departing aircraft.
dividend - A number to be divided.
dividers - A measuring tool having two movable legs,
each with sharp points. Dividers can be used to transfer
measurements or to divide straight or uniformly curved
lines into an equal number of parts.
diving blade - A blade track of a helicopter's main rotor
that lowers with an increase in revolutions per minute
(RPM).
divisor - The number by which a dividend is divided.
DME fix - A geographical position determined by
reference to a navigational aid which provides distance
and azimuth information. It is defined by a specific
distance in nautical miles and a radial, azimuth, or
course (i.e., localizer) in degrees magnetic from that
aid.
DME separation - Spacing of aircraft in terms of
distances (nautical miles) determined by reference to
distance measuring equipment (DME).
dock - An enclosed work area where airplanes can be
placed for repairs.
docking - Placing an airplane in a hangar where dock
platforms are used to facilitate maintenance.
DOD FLIP - Department of Defense Flight Information
Publications used for flight planning, enroute, and
terminal operations. FLIP is produced by the National
Imagery and Mapping Agency (NIMA) for worldwide
use. United States Government Flight Information
Publications (enroute charts and instrument approach
procedure charts) are incorporated in DOD FLIP for
use in the National Airspace System (NAS).
doghouse - A mark on a turn and slip indicator that
resembles a doghouse. It is located one needle width
away from the center and when the pointer aligns with
it a standard rate of turn is being made.
dolly - A low mobile platform on wheels or casters used
for moving heavy aircraft components.
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divergence Doppler effect
dolly block - Variously shaped anvils used to form and
finish sheet metal parts.
dolphin flight - In gliders, straight flight following
speed-to-fly theory. Glides can often be extended and
average cross-country speeds increased by flying faster
in sink and slower in lift without stopping to circle.
domain - Spheres of magnetic influence around
molecules of metals containing iron. Magnetic fields.
domains of learning - In addition to the four basic
levels of learning, psychologists have developed three
domains of learning: cognitive, psychomotor, and
affective. These domains represent what is to be gained
during the learning process, either knowledge, skills, or
attitudes.
domestic airspace - Airspace which overlies the
continental land mass of the United States plus Hawaii
and U.S. possessions. Domestic airspace extends to 12
miles offshore.
donor - An impurity used in a semiconductor to provide
flee electrons as current carriers. A semiconductor with
a donor impurity is said to be type N.
donor atom - An atom of a material that has more
electrons than needed for normal covalent bonding.
Used with germanium or silicon in semiconductors to
create diodes and transistors.
donor impurity - The elements added to germanium or
silicon to create diodes and transistors.
dope - The finishing material used on fabric surfaces
that tautens, strengthens, and weatherproofs the fabric.
dope proofing - Coating the structural elements of a
fabric-covered aircraft to protect them from the
solvents in the dope.
dope roping - A condition in the application of dope in
which the surface dries while the dope is being
brushed. This results in a stringy, uneven surface.
doped-in panel - An entire panel between ribs and from
the trailing edge to the leading edge that is doped in
place, but includes rib stitching on sections over the
ribs.
doped-on fabric repair - The repair of small damage to
a fabric covered aircraft by doping a patch directly to
the fabric covering using no other attachment
doped-on fabric repair - Repair of a small section of a
fabric structure. ?$pically applied by doping on a patch
over a small hole or tear in the fabric.
dope-proof paint - A paint applied to protect structure
from being damaged by the solvents in the dope.
Doppler effect - The effect where any oscillating
frequency, whether sound or radar beams, are
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compressed (increased in frequency) as the source and
the -receiver move closer to each other and