Pilot/Controller Glossary
4/20/23
PCG E
−
2
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)
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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
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(See AERONAUTICAL CHART.)
EN ROUTE DECISION SUPPORT TOOL (EDST)
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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
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Descent from the en route cruising altitude which takes place along the route of flight.
EN ROUTE HIGH ALTITUDE CHARTS
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(See AERONAUTICAL CHART.)
EN ROUTE LOW ALTITUDE CHARTS
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(See AERONAUTICAL CHART.)
EN ROUTE MINIMUM SAFE ALTITUDE WARNING (E
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MSAW)
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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 TRANSITION
−
(See SEGMENTS OF A SID/STAR.)
EN ROUTE TRANSITION WAYPOINT
(See SEGMENTS OF A SID/STAR.)
eSRS
–
(See ENHANCED SPECIAL REPORTING SERVICE.)
EST
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(See ESTIMATED.)
ESTABLISHED
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To be stable or fixed at an altitude or on a course, route, route segment, heading, instrument
approach or departure procedure, etc.
ESTABLISHED ON RNP (EoR) CONCEPT– A system of authorized instrument approaches, ATC procedures,
surveillance, and communication requirements that allow aircraft operations to be safely conducted with
approved reduced separation criteria once aircraft are established on a PBN segment of a published instrument
flight procedure.
ESTIMATED (EST)
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When used in NOTAMs “EST” is a contraction that is used by the issuing authority only
when the condition is expected to return to service prior to the expiration time. Using “EST” lets the user know
that this NOTAM has the possibility of returning to service earlier than the expiration time. Any NOTAM which
includes an “EST” will be auto
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expired at the designated expiration time.
ESTIMATED ELAPSED TIME [ICAO]
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The estimated time required to proceed from one significant point to
another.
(See ICAO Term TOTAL ESTIMATED ELAPSED TIME.)
ESTIMATED OFF-BLOCK TIME [ICAO]
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The estimated time at which the aircraft will commence movement
associated with departure.
Pilot/Controller Glossary
10/5/23