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 FAAO 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.