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Aeronautical Information Manual (AIM), page 641

5/26/16
12/10/15

E
EAS-
(See EN ROUTE AUTOMATION SYSTEM.)

EDCT-
(See EXPECT DEPARTURE CLEARANCE
TIME.)

EDST-
(See EN ROUTE DECISION SUPPORT TOOL)

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 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
Pilot/Controller Glossary

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- 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.

EN ROUTE DESCENT- Descent from the en route
cruising altitude which takes place along the route of
flight.

EN ROUTE HIGH ALTITUDE CHARTS-

(See AERONAUTICAL CHART.)
EN ROUTE LOW ALTITUDE CHARTS-
(See AERONAUTICAL CHART.)

EN ROUTE MINIMUM SAFE ALTITUDE WARN-
ING- A function of the EAS that aids the controller
by providing an alert when a tracked aircraft is below
or predicted by the computer to go below a
predetermined minimum IFR altitude (MIA).
EN ROUTE SPACING PROGRAM (ESP)- A
program designed to assist the exit sector in
achieving the required in-trail spacing.

EN ROUTE TRANSITION-
a. Conventional STARs/SIDs. The portion of a
SID/STAR that connects to one or more en route
airway/jet route.
b. RNAV STARs/SIDs. The portion of a STAR
preceding the common route or point, or for a SID the
portion following, that is coded for a specific en route
fix, airway or jet route.
ESP-
(See EN ROUTE SPACING PROGRAM.)

ESTABLISHED-To be stable or fixed on a route,
route segment, altitude, heading, etc.

PCG E-1

Page 641 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   640 -- Page 641 -- 642