Aeronautical Terms beginning with E
EDCT
Expect Departure Clearance Time
Eddy currents
Current induced in a metal cup or disc when it is crossed by lines of flux from a moving magnet.
EFAS
En Route Flight Advisory Service.
EFB
Electronic Flight Bag
EFC
Expect-Further-Clearance.
EFIS
Electronic Flight Information System
EFV
Enhanced Flight Visibility
EFVS
Enhanced Flight Vision System.
EGPWS
Enhanced Ground Proximity Warning Systems
EICAS
Engine Indicating and Crew Alerting System
Electronic Flight Bag (EFB)
An electronic display system intended primarily for cockpit or cabin use. EFB devices can display a variety of aviation data or perform basic calculations (e.g., performance data, fuel calculations, etc.). In the past, some of these functions were traditionally accomplished using paper references or were based on data provided to the flight crew by an airlines flight dispatch function. The scope of the EFB system functionality may also include various other hosted databases and applications. Physical EFB displays may use various technologies, formats, and forms of communication. These devices are sometimes referred to as auxiliary performance computers (APC) or laptop auxiliary performance computers (LAPC).
Electronic flight display (EFD)
For the purpose of standardization, any flight instrument display that uses LCD or other image-producing system (Cathode Ray Tube [CRT], etc.)
Elevator illusion
The sensation of being in a climb or descent, caused by the kind of abrupt vertical accelerations that result from up- or downdrafts.
Ellipsoid of Revolution
The surface that results when an ellipse is rotated about one of its axes.
EM wave
Electromagnetic wave.
Emergency
A distress or urgent condition.
Emergency Safe Altitudes
Altitudes depicted on approach charts which provide at least 1,000 feet of obstacle clearance in nonmountainous areas and 2,000 feet of obstacle clearance in designated mountainous areas within a 100-mile radius of the navigation facility upon which the procedure is predicated and normally used only in military procedures. These altitudes are identified on published procedures as “Emergency Safe Altitudes.”
Emphasis error
The result of giving too much attention to a particular instrument during the cross-check, instead of relying on a combination of instruments necessary for attitude and performance information.
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.
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.
En Route Charts
Aeronautical Chart.
En Route Descent
Descent from the en route cruising altitude which takes place along the route of flight.
En route facilities ring
Depicted in the plan view of IAP charts, a circle which designates NAVAIDs, fixes, and intersections that are part of the en route low altitude airway structure.
En Route Flight Advisory Service (EFAS)
An en route weather-only AFSS service.
En Route High Altitude Charts
Provide aeronautical information for en route instrument navigation (IFR) in the high altitude stratum. Information includes the portrayal of jet routes, identification and frequencies of radio aids, selected airports, distances, time zones, special use airspace, and related information.
En route high-altitude charts
Aeronautical charts for en route instrument navigation at or above 18,000 feet MSL.
En route low-altitude charts
Aeronautical charts for en route IFR navigation below 18,000 feet MSL.
En Route Minimum Safe Altitude Warning
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 Obstacle Clearance Areas
Obstacle clearance areas for en route planning are identified as primary, secondary, and turning areas, and they are designed to provide obstacle clearance route protection width for airways and routes.
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.
Encoding altimeter
A special type of pressure altimeter used to send a signal to the air traffic controller on the ground, showing the pressure altitude the aircraft is flying.
EPE
Estimated Position Error
Equivalent airspeed
Airspeed equivalent to CAS in standard atmosphere at sea level. As the airspeed and pressure altitude increase, the CAS becomes higher than it should be, and a correction for compression must be subtracted from the CAS.
Estimated Elapsed Time [ICAO]
The estimated time required to proceed from one significant point to another.
Estimated Off-Block Time [ICAO]
The estimated time at which the aircraft will commence movement associated with departure.
Estimated Position Error (EPE)
A measure of the current estimated navigational performance. Also referred to as Actual Navigation Performance (ANP).
ETA
Estimated Time of Arrival
EWINS
Enhanced Weather Information System
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.”
Expanded Service Volume
When ATC or a procedures specialist requires the use of a NAVAID beyond the limitations specified for standard service volume, an expanded service volume (ESV) may be established. See standard service volume.
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.
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.
Restrict the list to specific categories by clicking on the menubar at the top of the screen.