4/20/23
Pilot/Controller Glossary
Traffic Management Programs (STMPs), and airport
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specific information. These notices are applicable to
operations within the United States and can be found on the Domestic Notices website.
DOWNBURST
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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
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(See TRAFFIC PATTERN.)
DP
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(See INSTRUMENT DEPARTURE PROCEDURE.)
DRA
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(See DEBRIS RESPONSE AREA.)
DRAG CHUTE
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A parachute device installed on certain aircraft which is deployed on landing roll to assist in
deceleration of the aircraft.
DROP ZONE
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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
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(See DEPARTURE SEQUENCING PROGRAM.)
DTAS
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(See DIGITAL TERMINAL AUTOMATION SYSTEM.)
DUE REGARD
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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
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2
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1, WORD MEANINGS.)
DUTY RUNWAY
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(See RUNWAY IN USE/ACTIVE RUNWAY/DUTY RUNWAY.)
DVA
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(See DIVERSE VECTOR AREA.)
DVFR
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(See DEFENSE VISUAL FLIGHT RULES.)
DVFR FLIGHT PLAN
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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
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(See DIVERSION.)
DYNAMIC
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Continuous review, evaluation, and change to meet demands.
DYNAMIC RESTRICTIONS
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Those restrictions imposed by the local facility on an “as needed” basis to
manage unpredictable fluctuations in traffic demands.
PCG D
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