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(See RADAR.)
(Refer to AIM.)
DISCRETE FREQUENCY− A separate radio frequency
for use in direct pilot-controller communications
in air traffic control which reduces frequency
congestion by controlling the number of aircraft
operating on a particular frequency at one time.
Discrete frequencies are normally designated for
each control sector in en route/terminal ATC facilities.
Discrete frequencies are listed in the Airport/Facility
Directory and the DOD FLIP IFR En Route
Supplement.
(See CONTROL SECTOR.)
DISPLACED THRESHOLD− A threshold that is
located at a point on the runway other than the
designated beginning of the runway.
(See THRESHOLD.)
(Refer to AIM.)
DISTANCE MEASURING EQUIPMENT− Equipment
(airborne and ground) used to measure, in
nautical miles, the slant range distance of an aircraft
from the DME navigational aid.
(See MICROWAVE LANDING SYSTEM.)
(See TACAN.)
(See VORTAC.)
DISTRESS− A condition of being threatened by
serious and/or imminent danger and of requiring
immediate assistance.
DIVE BRAKES−
(See SPEED BRAKES.)
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 MVA/MIA, established in accordance with
the TERPS criteria for diverse departures, obstacles
and terrain avoidance, may be issued to departing
aircraft.
DIVERSION (DVRSN)− Flights that are required to
land at other than their original destination for
reasons beyond the control of the pilot/company, e.g.
periods of significant weather.
DME−
(See DISTANCE MEASURING EQUIPMENT.)
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.
(See DISTANCE MEASURING EQUIPMENT.)
(See FIX.)
(See MICROWAVE LANDING SYSTEM.)
DME SEPARATION− Spacing of aircraft in terms of
distances (nautical miles) determined by reference to
distance measuring equipment (DME).
(See DISTANCE MEASURING EQUIPMENT.)
DOD FLIP− Department of Defense Flight Information
Publications used for flight planning, en route,
and terminal operations. FLIP is produced by the
National Imagery and Mapping Agency (NIMA) for
world-wide use. United States Government Flight
Information Publications (en route charts and instrument
approach procedure charts) are incorporated in
DOD FLIP for use in the National Airspace System
(NAS).
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.
DOWNBURST− A strong downdraft which induces
an outburst of damaging winds on or near the ground.
Damaging winds, either straight or curved, are highly
divergent. The sizes of downbursts vary from 1/2
mile or less to more than 10 miles. An intense
Pilot/Controller Glossary 2/19/04
PCG D−4
downburst often causes widespread damage. Damaging
winds, lasting 5 to 30 minutes, could reach speeds
as high as 120 knots.
DOWNWIND LEG−
(See TRAFFIC PATTERN.)
DP−
(See INSTRUMENT DEPARTURE
PROCEDURE.)
DRAG CHUTE− A parachute device installed on
certain aircraft which is deployed on landing roll to
assist in deceleration of the aircraft.
DSP−
(See DEPARTURE SEQUENCING PROGRAM.)
DT−
(See DELAY TIME.)
DUE REGARD− A phase of flight wherein an
aircraft commander of a State-operated aircraft
assumes responsibility to separate his/her aircraft
from all other aircraft.
(See also FAAO 7110.65, Para 1−2−1, WORD
MEANINGS.)
DUTY RUNWAY−
(See RUNWAY IN USE/ACTIVE RUNWAY/DUTY
RUNWAY.)
DVA−
(See DIVERSE VECTOR AREA.)
DVFR−
(See DEFENSE VISUAL FLIGHT RULES.)
DVFR FLIGHT PLAN− A flight plan filed for a VFR
aircraft which intends to operate in airspace within
which the ready identification, location, and control
of aircraft are required in the interest of national
security.
DVRSN−
(See DIVERSION.)
DYNAMIC− Continuous review, evaluation, and
change to meet demands.
DYNAMIC RESTRICTIONS− Those restrictions
imposed by the local facility on an “as needed” basis
　
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