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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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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.

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