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Pilot/Controller Glossary

3/29/18

PCG E−1

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

(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, 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.)

ENHANCED FLIGHT VISION SYSTEM (EFVS)−

An EFVS is an installed aircraft system which uses

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.
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.

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 (E−MSAW)− 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.