background image

Pilot/Controller Glossary

3/29/18

PCG D−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−

(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.)

DT−

(See DELAY TIME.)

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.