E‐MSAW-

(See EN ROUTE MINIMUM SAFE ALTITUDE WARNING.)

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).)

ELIGIBILITY– Designates which sector is eligible to exchange CPDLC messages with a specific aircraft.

ELT-

(See EMERGENCY LOCATOR TRANSMITTER.)

EMBEDDED ROUTE TEXT- An EDST notification that an ADR/ADAR/AAR has been applied to the flight ­plan. Within the route field, sub-fields consisting of an adapted route or an embedded change in the route are ­color-coded in cyan with cyan brackets around the sub-field.

(See EN ROUTE DECISION SUPPORT TOOL.)

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 121.5MHz and 243.0MHz. 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 14CFR part91.)

(Refer to AIM.)

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 authorization 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.

ENHANCED SPECIAL REPORTING SERVICE (eSRS)– An automated service used to enhance search and ­rescue operations that provides flight service specialists in Alaska direct information from the aircraft's ­registered tracking device.

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 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 WARNING (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 TRANSITION-

(See SEGMENTS OF A SID/STAR.)

EN ROUTE TRANSITION WAYPOINT

(See SEGMENTS OF A SID/STAR.)

eSRS–

(See ENHANCED SPECIAL REPORTING SERVICE.)

EST-

(See ESTIMATED.)

ESTABLISHED- 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)-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-expired at the designated expiration time.

ESTIMATED ELAPSED TIME [ICAO]- The estimated time required to proceed from one significant point to ­another.

(See ICAO Term TOTAL ESTIMATED ELAPSED TIME.)

ESTIMATED OFF‐BLOCK TIME [ICAO]- The estimated time at which the aircraft will commence movement ­associated with departure.

ESTIMATED POSITION ERROR (EPE)-

(See Required Navigation Performance)

ESTIMATED TIME OF ARRIVAL- The time the flight is estimated to arrive at the gate (scheduled operators) ­or the actual runway on times for nonscheduled operators.

ESTIMATED TIME EN ROUTE- The estimated flying time from departure point to destination (lift‐off to ­touchdown).

ETA-

(See ESTIMATED TIME OF ARRIVAL.)

ETE-

(See ESTIMATED TIME EN ROUTE.)

EXECUTE MISSED APPROACH- Instructions issued to a pilot making an instrument approach which means ­continue inbound to the missed approach point and execute the missed approach procedure as described on the ­Instrument Approach Procedure Chart or as previously assigned by ATC. The pilot may climb immediately to ­the altitude specified in the missed approach procedure upon making a missed approach. No turns should be ­initiated prior to reaching the missed approach point. When conducting an ASR or PAR approach, execute the ­assigned missed approach procedure immediately upon receiving instructions to “execute missed approach.”

(Refer to AIM.)

EXPECT (ALTITUDE) AT (TIME) or (FIX)- Used under certain conditions to provide a pilot with an altitude ­to be used in the event of two‐way communications failure. It also provides altitude information to assist the pilot ­in planning.

(Refer to AIM.)

EXPECT DEPARTURE CLEARANCE TIME (EDCT)- The runway release time assigned to an aircraft in a ­traffic management program and shown on the flight progress strip as an EDCT.

(See GROUND DELAY PROGRAM.)

EXPECT FURTHER CLEARANCE (TIME)- The time a pilot can expect to receive clearance beyond a ­clearance limit.

EXPECT FURTHER CLEARANCE VIA (AIRWAYS, ROUTES OR FIXES)- Used to inform a pilot of the ­routing he/she can expect if any part of the route beyond a short range clearance limit differs from that filed.

EXPEDITE- Used by ATC when prompt compliance is required to avoid the development of an imminent ­situation. Expedite climb/descent normally indicates to a pilot that the approximate best rate of climb/descent ­should be used without requiring an exceptional change in aircraft handling characteristics.