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European Air Chiefs
European Air Chiefs Free-ranging conference held twice
per year since 1993 to promote air-power co-operation.
Europilote European organization of airline pilots’
associations.
europium Symbol Eu, soft silvery metal, a lanthanide;
density 5.243, MPt 822°C, many uses in phosphors, screen
coatings, semiconducting alloys and lasers.
Europol Intra-European air-transport policy (ECAC).
Eurospace Popular name for AESI (merged 27 April
2004 into ASD5).
EUR-TFG European Traffic-Forecast Group
(Eurocontrol).
eutectic point Lowest temperature at which mixture can
be maintained in liquid phase; lowest melting or freezing
point of alloy.
Eutelsat European Telecommunications Satellite
Organization (Int.).
EUV Extreme ultra-violet, just beyond FUV (ie shorter
wavelength); E adds Explorer.
EUVSA European Unmanned Vehicle Systems
Association (Int.).
EV 1 Enhanced vision.
2 EAS (F).
3 Earned value.
Ev Every.
eV Electron-volt, gain in energy acquired by electron
gaining one volt in potential, 1.60219 × 10 –19 J.
EVA 1 Extravehicular activity; carried on outside
spacecraft or on lunar surface.
2 Equipement vocal pour l’aéronef, (cockpit human
voice control) (F).
3 Equipe de Voltige Aérien (F, = team).
4 Economic value added.
evaluation 1 Appraisal of information in terms of credibility,
reliability, pertinency and accuracy; for US and
NATO letters A–F indicate reliability and numbers 1–6
accuracy; thus B-2 indicates probably true from usually
reliable source, while E-means improbable from unreliable
source.
2 Process of assessing proposal, design or hardware,
usually on comparative basis in course of commercial or
military procurement.
Evaluation Assurance Level Any of seven rankings of
multiple independent levels of security of the Common
Criteria; DO-178B is ranked by different authorities at
EAL4+ or EAL5, while no commercial operating system
has achieved a level above 4.
evaporative cooling Cooling system which uses latent
heat of evaporation by allowing coolant to boil, then
condensing and recycling it.
evaporative ice Ice formed in engine induction system on
surface cooled by evaporation; can form from water or
vapour at air temperatures up to 25°C.
EVAS Emergency vision assurance system = smoke
goggles.
Evasion Ensemble de Visualisation et d’Affichage au
Service de l’Instructeur à Organisation Numérique.
evasive action Flight manoeuvre performed by aircraft
to evade defending forces, esp. AAA fire.
EVC Embedded visual computer, or computing.
EVCS Extravehicular communications system.
EVD 1 Elementary vortex distribution.
2 Explosive-vapour detector.
EWES
EVED Eidg. Verkehrs und Energiewirtschafts
Departement (Switz.).
event At an airport, either a takeoff or a landing.
event marker Time-dependent indicator in HUD.
Everel propeller One of the few single-bladed propellers
to have achieved any commercial success, the blade being
counterbalanced by a lead cylinder (US c1930–40).
Everling number
3
No = –––
n V W 0 /p
= ––––––––– C
. –––––
C D 96,000σ W 0 /S
where n is propulsion efficiency, C D total drag coefficient,
V C max level KEAS, σ relative density, W o /P power
loading and W o /S wing loading.
Evett’s Field Airfield serving WRE (Australia).
EVF Enter visual fix.
EVG Electrostatically supported vacuum gyro.
EVIR Enhanced-vision IR.
EVM 1 Engine-vibration monitor.
2 Error-vector magnitude.
3 Earth-viewing module.
EVO Hellenic arms industry.
EVP Executive vice-president.
EVR Electronic video recording.
EVS 1 Electro-optical viewing system.
2 Enhanced vision sensor, or system.
3 Electronic voice-switching [S adds system].
EVT 1 Extravehicular transfer.
2 Educational and vocational training (for return to
civilian life).
EW 1 Electronic[s] warfare.
2 Early warning.
3 Equatorial [warmer] air.
4 Elliptical waveguide.
5 Examining Wing.
6 Expeditionary warfare.
EWA European Wind-tunnel Association (Int.).
EWAAS End-state wide-area augmentation system.
EWAC 1 Electronic-Warfare Aircraft Commander
(USN).
2 Electronic-warfare analysis centre.
EW/Aco Electronic warfare and/or acoustic (RAF
aircrew trade).
EWACS, Ewacs 1 Electronic wide-angle camera system.
2 Early warning and control system.
EWADS Expeditionary warfare air-defense systems.
EWAISF Electronic warfare avionics integrated
support facility.
EWAM Extended-window addressable memory.
EW&C Early warning and control.
EWAP Electronic-warfare AGE [access on ground
equipment] panel.
EWAS Electronic-warfare analysis system.
EWAT Electronic-warfare advanced technology.
EWAU Electronic-warfare avionics unit (RAF).
EWBM Electronic-warfare battle management.
EWCC 1 Electronic-Warfare Combat Co-ordinator.
2 Electronic-warfare co-ordination cell (NATO).
EWCS Electronic-warfare coordination system, or
command station.
EWCU Electronic-warfare computer unit.
EWEDS Electronic-warfare evaluation display system.
EWEP Electronic-warfare evaluation program
(USAF).
EWES Electronic-warfare evaluation system.
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