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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.
DEVIATIONSa.
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.)
DIGITAL‐AUTOMATIC TERMINAL INFORMATION
SERVICE (D‐ATIS)- The service provides
text messages to aircraft, airlines, and other users
outside the standard reception range of conventional
ATIS via landline and data link communications to
the cockpit. Also, the service provides a computersynthesized
voice message that can be transmitted to
all aircraft within range of existing transmitters. The
Terminal Data Link System (TDLS) D‐ATIS
application uses weather inputs from local automated
weather sources or manually entered meteorological
data together with preprogrammed menus to provide
standard information to users. Airports with D‐ATIS
capability are listed in the Airport/Facility Directory.
DIGITAL TARGET- A computer-generated symbol
representing an aircraft's position, based on a primary
return or radar beacon reply, shown on a digital
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
　
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