Pilot/Controller Glossary

8/15/19

PCG D

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4

divergent. The sizes of downbursts vary from 1/2
mile or less to more than 10 miles. An intense
downburst often causes widespread damage. Damag-
ing 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.)

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.)

DT

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(See DELAY TIME.)

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.