Pilot/Controller Glossary

DOD FLIP- Department of Defense Flight Information Publications used for flight planning, en route,
and terminal operations. FLIP is produced by the
National Geospatial-Intelligence Agency (NGA) 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.
DOMESTIC NOTICE- A special notice or notice
containing graphics or plain language text pertaining
to almost every aspect of aviation, such as military
training areas, large scale sporting events, air show
information, Special Traffic Management Programs
(STMPs), and airport-specific information. These
notices are applicable to operations within the United
States and can be found on the Domestic Notices
website.
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
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.

DROP ZONE- Any pre-determined area upon which
parachutists or objects land after making an
intentional parachute jump or drop.
(Refer to 14 CFR 105.3, Definitions)

DSP-
(See DEPARTURE SEQUENCING PROGRAM.)

DTAS-
(See DIGITAL TERMINAL AUTOMATION
SYSTEM.)

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 FAA Order JO 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
to manage unpredictable fluctuations in traffic
demands.