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the TERPS criteria for diverse departures, obstacles
and terrain avoidance, may be issued to departing
aircraft.
DIVERSION (DVRSN)- Flights that are required to
land at other than their original destination for
reasons beyond the control of the pilot/company, e.g.
periods of significant weather.
DME-
(See DISTANCE MEASURING EQUIPMENT.)
Pilot/Controller Glossary 2/14/08
PCG D-4
DME FIX- A geographical position determined by
reference to a navigational aid which provides
distance and azimuth information. It is defined by a
specific distance in nautical miles and a radial,
azimuth, or course (i.e., localizer) in degrees
magnetic from that aid.
(See DISTANCE MEASURING EQUIPMENT.)
(See FIX.)
(See MICROWAVE LANDING SYSTEM.)
DME SEPARATION- Spacing of aircraft in terms of
distances (nautical miles) determined by reference to
distance measuring equipment (DME).
(See DISTANCE MEASURING EQUIPMENT.)
DOD FLIP- Department of Defense Flight Information
Publications used for flight planning, en route,
and terminal operations. FLIP is produced by the
National Imagery and Mapping Agency (NIMA) for
world‐wide use. United States Government Flight
Information Publications (en route charts and
instrument approach procedure charts) are incorporated
in DOD FLIP for use in the National Airspace
System (NAS).
DOMESTIC AIRSPACE- Airspace which overlies
the continental land mass of the United States plus
Hawaii and U.S. possessions. Domestic airspace
extends to 12 miles offshore.
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. Damaging
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.
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 FAAO 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.
2/14/08 Pilot/Controller Glossary
PCG E-1
E
EAS-
(See EN ROUTE AUTOMATION SYSTEM.)
EDCT-
(See EXPECT DEPARTURE CLEARANCE
TIME.)
EFC-
(See EXPECT FURTHER CLEARANCE (TIME).)
ELT-
(See EMERGENCY LOCATOR TRANSMITTER.)
EMERGENCY- A distress or an urgency condition.
EMERGENCY LOCATOR TRANSMITTER- A
radio transmitter attached to the aircraft structure
which operates from its own power source on
121.5 MHz and 243.0 MHz. It aids in locating
downed aircraft by radiating a downward sweeping
audio tone, 2‐4 times per second. It is designed to
function without human action after an accident.
(Refer to 14 CFR Part 91.)
(Refer to AIM.)
E‐MSAW-
(See EN ROUTE MINIMUM SAFE ALTITUDE
WARNING.)
EN ROUTE AIR TRAFFIC CONTROL SERVICES-
Air traffic control service provided aircraft
on IFR flight plans, generally by centers, when these
aircraft are operating between departure and
destination terminal areas. When equipment, capabilities,
and controller workload permit, certain
advisory/assistance services may be provided to VFR
aircraft.
(See AIR ROUTE TRAFFIC CONTROL
CENTER.)
(Refer to AIM.)
EN ROUTE AUTOMATION SYSTEM (EAS)- The
complex integrated environment consisting of
situation display systems, surveillance systems and
flight data processing, remote devices, decision
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