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Pilot/Controller Glossary 

6/17/21 

training areas, large scale sporting events, air show 
information, Special Traffic Management Programs 
(STMPs), and airport

specific information. These 

notices are applicable to operations within the United 
States and can be found on the Domestic Notices 
website. 

DOWNBURST

 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. 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. 

PCG D