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eccentricity
eccentricity 1 Deviation from common centre or central
point of application of load.
2 Of any conic, ratio of length of radius vector through
point on conic to distance of point from directrix.
3 Of ellipse, ratio of distance between centre and focus
to semimajor axis. Also called numerical *.
4 Also of ellipse, distance between centre and focus.
Also called linear *.
5 Distance measured chordwise between a wing’s aerodynamic
centre and its elastic [torsional] axis.
ECCM Electronic counter-countermeasures.
Eccosorb Important family of commercially available
SFAs (RAM).
ECCP European Climate Change Programme (Int.).
ECD 1 Excusable contract delay (no penalty).
2 Equipment Capability Directorate[s] (MoD).
3 Engineering cognisance drawing.
ECDES Electronic combat digital evaluation system
(USAF).
ECDIS Electronic charts and data-information
system[s].
ECDS Enhanced container delivery system.
ECDU Enhanced control and display unit.
ECE Economic Commission for Europe (UN).
ECEF Earth-centred, Earth-fixed.
ECF Enhanced connective facility (SNA).
ECFS Empire Central Flying School.
ECG Electrochemically assisted grinding.
ECGD Export Credits Guarantee Department (UK).
ECH Electrochemically assisted honing.
echelon 1 Aircraft formation in which each member is
above, behind, and to left or right of predecessor; such
formation is said to be in * to port or starboard.
2 Subdivision of headquarters, forward or rear.
3 Level of command.
4 Servicing unit detailed to provide ground support and
maintenance facilities.
Echo, ECHO Enhanced C 4 ISR for homeland security
operations, an attempted synthesis of GCCS, Adocs (2)
and CATS(4) (US, 2003).
echo 1 Pulse of reflected RF energy, esp. that reaching
the receiver.
2 Appearance on radar display of such energy returned
from target; also called blip.
ECHS Electrochemical hydrogen separator [fuel cell].
ECI 1 Electronic commerce infrastructure.
2 Earth-centred inertial.
ECIF Electronic Components Industry Federation,
[office, London] (UK).
ECIM Electronics computer-integrated manufacturing,
ie, CIM of electronics.
ECIPS, Ecips Electronic-combat or countermeasures,
integrated pylon system.
ECIT Enhanced communications interface transceiver.
ECJ European Court of Justice.
ECL 1 Emitter coupled logic.
2 Electro-generated chemiluminescence.
3 Engine, or equipment, condition lever (CAA).
4 Electronic checklist.
ecliptic Apparent path of Sun among stars because of
Earth’s annual revolution; intersection of plane
of Earth’s orbit with celestial sphere, inclined at about
23° 27' to celestial equator.
ECS
ECLSS Environmental control and life-support system
[or subsystems].
ECM 1 Electronic countermeasures.
2 Electrochemical machining.
3 Engine-, or equipment-, condition monitoring.
4 Electronic control module.
ECMJ Escadrille de chasse multiplace de jour (multiseat
day fighter squadron) (F).
ECMO ECM officer (aircrew).
ECMS 1 Electronic component management system.
2 Engine condition monitoring system.
ECMT 1 European Conference of Ministers of
Transport = CEMT [Paris F-75775] (Int.).
2 Emerging counter-Manpads technologies.
ECN Escadrille de chasse de nuit [night fighter
squadron] (F).
ECNI Enhanced CNI.
ECNP Export control and non-proliferation (UK).
ECO 1 Electron-coupled oscillator.
2 Engineering change order.
3 Engine cut-off.
ECOA Engine certificate of Airworthiness.
ECOC Enhanced Combat Operations Center.
Ecofin Council of Ministers for Economics and
Financial Affairs (EU).
Ecogas European Council of GA Support (Int.).
ECOM 1 Earth centre of mass.
2 Electronic Command (USA).
Econ Economy.
economical cruise mixture Piston engine mixture with
which AMPG is maximum.
economiser Reservoir in continuous-flow oxygen
system in which oxygen exhaled by user is collected for
recirculation.
economiser valve Assists in regulating fuel flow through
piston engine carburettor, opened by increased airflow.
economy Originally a passenger fare cheaper than first
class, with less luxurious standards of cabin service, meals,
seat pitch etc. IATA airlines introduced * class over North
Atlantic in April 1958.
economy-class syndrome Normally means DVT (1).
ECOP Electronic copilot [colloq.].
ECP 1 Engineering change proposal, for introducing
modification.
2 Etablissement Cinématographique et Photographique
des Armées (F).
3 Effective candlepower (non-SI).
4 Eicas control panel.
5 Engine critical part[s].
ECPNL Equivalent Continuous Perceived Noise Level
(see noise).
ECPP Effective critical parts plan.
ECPS Environmentally compatible propulsion system.
ECR 1 Electronic combat and reconnaissance.
2 Embedded computer resources.
ECS 1 Environmental control system.
2 Electronic Combat Squadron.
3 Engagement control station.
4 European company statute.
5 Engine-consumed spares.
6 Engineering compiler system.
7 Event-criterion sub-field.
8 Electronic chart system.
9 Engine control system, F adds failure.
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