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display.
DIGITAL TERMINAL AUTOMATION SYSTEM
(DTAS)- A system where digital radar and beacon
data is presented on digital displays and the
operational program monitors the system performance
on a real-time basis.
DIGITIZED TARGET- A computer-generated
indication shown on an analog radar display resulting
from a primary radar return or a radar beacon reply.
DIRECT- Straight line flight between two navigational
aids, fixes, points, or any combination thereof.
When used by pilots in describing off‐airway routes,
points defining direct route segments become
compulsory reporting points unless the aircraft is
under radar contact.
DIRECT ALTITUDE AND IDENTITY READOUT-
The DAIR System is a modification to the
2/14/08 Pilot/Controller Glossary
PCG D-3
AN/TPX‐42 Interrogator System. The Navy has two
adaptations of the DAIR System‐Carrier Air Traffic
Control Direct Altitude and Identification Readout
System for Aircraft Carriers and Radar Air Traffic
Control Facility Direct Altitude and Identity Readout
System for land‐based terminal operations. The
DAIR detects, tracks, and predicts secondary radar
aircraft targets. Targets are displayed by means of
computer‐generated symbols and alphanumeric
characters depicting flight identification, altitude,
ground speed, and flight plan data. The DAIR System
is capable of interfacing with ARTCCs.
DIRECTION FINDER- A radio receiver equipped
with a directional sensing antenna used to take
bearings on a radio transmitter. Specialized radio
direction finders are used in aircraft as air navigation
aids. Others are ground‐based, primarily to obtain a
“fix” on a pilot requesting orientation assistance or to
locate downed aircraft. A location “fix” is established
by the intersection of two or more bearing lines
plotted on a navigational chart using either two
separately located Direction Finders to obtain a fix on
an aircraft or by a pilot plotting the bearing
indications of his/her DF on two separately located
ground‐based transmitters, both of which can be
identified on his/her chart. UDFs receive signals in
the ultra high frequency radio broadcast band; VDFs
in the very high frequency band; and UVDFs in both
bands. ATC provides DF service at those air traffic
control towers and flight service stations listed in the
Airport/Facility Directory and the DOD FLIP IFR En
Route Supplement.
(See DF FIX.)
(See DF GUIDANCE.)
DIRECTLY BEHIND- An aircraft is considered to
be operating directly behind when it is following the
actual flight path of the lead aircraft over the surface
of the earth except when applying wake turbulence
separation criteria.
DISCRETE BEACON CODE-
(See DISCRETE CODE.)
DISCRETE CODE- As used in the Air Traffic
Control Radar Beacon System (ATCRBS), any one
of the 4096 selectable Mode 3/A aircraft transponder
codes except those ending in zero zero; e.g., discrete
codes: 0010, 1201, 2317, 7777; nondiscrete codes:
0100, 1200, 7700. Nondiscrete codes are normally
reserved for radar facilities that are not equipped with
discrete decoding capability and for other purposes
such as emergencies (7700), VFR aircraft (1200), etc.
(See RADAR.)
(Refer to AIM.)
DISCRETE FREQUENCY- A separate radio
frequency for use in direct pilot‐controller communications
in air traffic control which reduces
frequency congestion by controlling the number of
aircraft operating on a particular frequency at one
time. Discrete frequencies are normally designated
for each control sector in en route/terminal ATC
facilities. Discrete frequencies are listed in the
Airport/Facility Directory and the DOD FLIP IFR En
Route Supplement.
(See CONTROL SECTOR.)
DISPLACED THRESHOLD- A threshold that is
located at a point on the runway other than the
designated beginning of the runway.
(See THRESHOLD.)
(Refer to AIM.)
DISTANCE MEASURING EQUIPMENT- Equipment
(airborne and ground) used to measure, in
nautical miles, the slant range distance of an aircraft
from the DME navigational aid.
(See MICROWAVE LANDING SYSTEM.)
(See TACAN.)
(See VORTAC.)
DISTRESS- A condition of being threatened by
serious and/or imminent danger and of requiring
immediate assistance.
DIVE BRAKES-
(See SPEED BRAKES.)
DIVERSE VECTOR AREA- In a radar environment,
that area in which a prescribed departure route
is not required as the only suitable route to avoid
obstacles. The area in which random radar vectors
below the MVA/MIA, established in accordance with
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