Pilot/Controller Glossary

EAS-
(See EN ROUTE AUTOMATION SYSTEM.)

EDCT-
(See EXPECT DEPARTURE CLEARANCE
TIME.)

EDST-
(See EN ROUTE DECISION SUPPORT TOOL)

EFC-

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(See EXPECT FURTHER CLEARANCE (TIME).)

ELT-

an electronic means to provide a display of the
forward external scene topography (the natural or
man-made features of a place or region especially in
a way to show their relative positions and elevation)
through the use of imaging sensors, including but not
limited to forward-looking infrared, millimeter wave
radiometry, millimeter wave radar, or low-light level
image intensification. An EFVS includes the display
element, sensors, computers and power supplies,
indications, and controls. An operator"s authoriza
tion to conduct an EFVS operation may have
provisions which allow pilots to conduct IAPs when
the reported weather is below minimums prescribed
on the IAP to be flown.

(See EMERGENCY LOCATOR TRANSMITTER.)

EMERGENCY- A distress or an urgency condition.

EMERGENCY AUTOLAND SYSTEM- This
system, if activated, will determine an optimal
airport, plot a course, broadcast the aircraft"s
intentions, fly to the airport, land, and (depending on
the model) shut down the engines. Though the system
will broadcast the aircraft"s intentions, the controller
should assume that transmissions to the aircraft will
not be acknowledged.
EMERGENCY DESCENT MODE- This automated
system senses conditions conducive to hypoxia
(cabin depressurization). If an aircraft is equipped
and the system is activated, it is designed to turn the
aircraft up to 90 degrees, then descend to a lower
altitude and level off, giving the pilot(s) time to
recover.
EMERGENCY LOCATOR TRANSMITTER
(ELT)- 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, 24 times per second. It is designed to
function without human action after an accident.
(Refer to 14 CFR Part 91.)
(Refer to AIM.)

EMSAW-
(See EN ROUTE MINIMUM SAFE ALTITUDE
WARNING.)

ENHANCED FLIGHT VISION SYSTEM (EFVS)-
An EFVS is an installed aircraft system which uses

EN ROUTE AIR TRAFFIC CONTROL SER
VICES- 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, capa
bilities, 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
support tools, and the related communications
equipment that form the heart of the automated IFR
air traffic control system. It interfaces with automated
terminal systems and is used in the control of en route
IFR aircraft.
(Refer to AIM.)

EN ROUTE CHARTS-
(See AERONAUTICAL CHART.)

EN ROUTE DECISION SUPPORT TOOL (EDST)-
An automated tool provided at each Radar Associate
position in selected En Route facilities. This tool
utilizes flight and radar data to determine present and
future trajectories for all active and proposal aircraft
and provides enhanced automated flight data
management.