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b. Magnetic− A predetermined desired course
direction to be followed (measured in degrees from
local magnetic north).
DESIRED TRACK− The planned or intended track
between two waypoints. It is measured in degrees
from either magnetic or true north. The instantaneous
angle may change from point to point along the great
circle track between waypoints.
DETRESFA (DISTRESS PHASE) [ICAO]− The
code word used to designate an emergency phase
wherein there is reasonable certainty that an aircraft
and its occupants are threatened by grave and
imminent danger or require immediate assistance.
DEVIATIONS−
a. A departure from a current clearance, such as an
off course maneuver to avoid weather or turbulence.
b. Where specifically authorized in the CFRs and
requested by the pilot, ATC may permit pilots to
deviate from certain regulations.
(Refer to AIM.)
DF−
(See DIRECTION FINDER.)
DF APPROACH PROCEDURE− Used under emergency
conditions where another instrument approach
procedure cannot be executed. DF guidance for an
instrument approach is given by ATC facilities with
DF capability.
(See DF GUIDANCE.)
(See DIRECTION FINDER.)
(Refer to AIM.)
DF FIX− The geographical location of an aircraft
obtained by one or more direction finders.
(See DIRECTION FINDER.)
DF GUIDANCE− Headings provided to aircraft by
facilities equipped with direction finding equipment.
These headings, if followed, will lead the aircraft to
a predetermined point such as the DF station or an
airport. DF guidance is given to aircraft in distress or
to other aircraft which request the service. Practice
DF guidance is provided when workload permits.
(See DIRECTION FINDER.)
(See DF FIX.)
(Refer to AIM.)
DF STEER−
(See DF GUIDANCE.)
DH−
(See DECISION HEIGHT.)
DH [ICAO]−
(See ICAO Term DECISION ALTITUDE/
DECISION HEIGHT.)
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
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
2/19/04 Pilot/Controller Glossary
PCG D−3
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.)
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.
　
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