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Pilot/Controller Glossary

3/29/18

PCG D−2

aircraft on the runway, terminal or center area

saturation, weather below landing minimums, etc.

(See EXPECT FURTHER CLEARANCE (TIME).)

DELAY TIME− The amount of time that the arrival

must lose to cross the meter fix at the assigned meter

fix time. This is the difference between ACLT and

VTA.

DEPARTURE CENTER− The ARTCC  having

jurisdiction for the airspace that generates a flight to

the impacted airport.

DEPARTURE CONTROL− A function of an

approach control facility providing air traffic control

service for departing IFR and, under certain

conditions, VFR aircraft.

(See APPROACH CONTROL FACILITY.)
(Refer to AIM.)

DEPARTURE SEQUENCING PROGRAM−  A

program designed to assist in achieving a specified

interval over a common point for departures.

DEPARTURE TIME− The time an aircraft becomes

airborne.

DESCEND VIA– An abbreviated ATC clearance that

requires compliance with a published  procedure

lateral path and associated speed restrictions and

provides a pilot-discretion descent to comply with

published altitude restrictions.

DESCENT SPEED ADJUSTMENTS− Speed decel-

eration calculations made to determine an accurate

VTA. These calculations start at the transition point

and use arrival speed segments to the vertex.

DESIGNATED COMMON TRAFFIC ADVISORY

FREQUENCY (CTAF) AREA− In  Alaska,  in

addition to being designated for the purpose of

carrying out airport advisory practices while

operating to or from an airport without an operating

airport traffic control tower, a CTAF may also be

designated for the purpose of carrying out advisory

practices for operations in and through areas with a

high volume of VFR traffic.

DESIRED COURSE−

a. True− A predetermined desired course direction

to be followed (measured in degrees from true north).

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.
DH−

(See DECISION HEIGHT.)

DH [ICAO]−

(See ICAO Term DECISION ALTITUDE/

DECISION HEIGHT.)

DIGITAL-AUTOMATIC TERMINAL INFORMA-

TION 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 computer−

synthesized 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 Chart Supplement U.S.
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 perfor-

mance 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.