1Dk4eXg

envelope diameter
6 Volume of airspace bounded by limits of effective use
of weapon.
envelope diameter 1 Diameter of circle encompassing
engine or other irregular object.
2 Diameter of airship envelope.
envelope jigging Precision assembly of stressed-skin
structure in reverse order, starting with skin in female jig
and then adding internals (Fairey).
ENVG Enhanced night-vision goggle[s] combining
thermal imager with image intensifier.
environmental chamber Chamber in which humidity,
temperature, pressure, solar radiation, noise and other
variables may be controlled to simulate different environments.
environmental control system, ECS Produces environment
in which human beings and equipment can work
satisfactorily.
environmental lapse rate Measured rate of decrease of
temperature with height; determined by vertical distribution
of temperature at given time and place, and
distinguished from process lapse rate of individual parcel
of air.
environmental mock-up Mock-up cabin intended to
assist design of ECS.
environmental stress screening Test procedure similar to
burn-through for promoting reliability with growth.
environmental system Environmental control system.
EO 1 Electro-optical, or optics; used thus in subsequent
definitions.
2 Engineering [or Executive] order.
3 Earth observation.
EOA 1 Early Operational Assessment.
2 Engine-out allowance.
E/O Engine out.
EOAR European Office of Aerospace Research
(USAF).
EOB Electronic order of battle.
EOBT Estimated off-block[s] time.
EOC 1 Electro-optic convertor.
2 Enhanced, or early, operational capability.
EOCCM, EOC 2 M EO counter-countermeasures.
EOCM EO countermeasures.
EOD 1 Explosive-ordnance disposal, or demolition; S
adds system, T reaining.
2 Electro-optical device [S adds system, T training].
3 End of day.
4 Enhanced operating database.
5 Embedded optical databus.
6 Erasable optical disc.
EoD Effects of defects.
EODAS, EOdas Electro-optical distributed-aperture
system.
EODAP, Eodap Earth and ocean dynamic applications
program.
EODC Earth-Observation Data Centre (UK).
EOE Elasto-optical effect.
EOEM Electronic original equipment manufacturer.
EOFC EO fire control.
EOFT Enhanced operational flight trainer.
EOGB Electro-optical[ly] guided bomb.
EO guidance Electro-optical guidance.
EOI Expression of interest, requested by potential
customer from supplier; if answered, could lead to ITT
(2).
EPC
EOIS EO imaging system.
EOIVS EO IR viewing system.
EOL 1 Engine-off landing.
2 Edge of light, use of reflected light at grazing angle to
highlight surface imperfections.
3 End of life; D adds disposal.
Eolia European pre-operational data-link applications
(ATC/Euret).
EOL power End-of-life power.
EOM 1 Earth observation mission.
2 End of message.
Eonnex Aircraft fabrics; name registered by Eonair Inc.
EOP 1 Engine oil pressure.
2 Engine operating point.
3 Enhanced operational capability.
4 End of production; R adds review.
EOQ Economic order quantity.
EOQC European Organization for Quality Control
(Int.).
EOR Extend/off/retract.
EoR Effects of repairs.
EOS 1 Electrophoresis operations in space.
2 EO sensor/system/subsystem/surveillance. Thus
EOSDS is surveillance and detection system, EOSS is
sensor system.
3 Earth observation satellite, or observing system; DIS
adds data and information system.
Eorsat Elint ocean-reconnaissance satellite.
EOSP EO signal processor.
EOT 1 EO target/tracking/threat: S adds system,
EOTADS target acquisition and detection system and
EOTWD threat-warning development.
2 End of test.
3 End of text.
4 Early orbit test[ing].
EOTS EO targeting system.
EOVL Engine-out vertical landing.
EOVS EO viewing system.
EOW EO warfare.
EP 1 External [or electric] power.
2 Environmental protection, [or plot], or processor [see
EPX].
3 Engineering project, or plan.
4 Extended performance (target).
5 Electronic protection.
6 l’Espace Première = 1 st class (F).
7 Enhancement phase.
8 Equipment Programme [MoD] (UK).
9 Evolutions programme.
EPA 1 Environmental Protection Agency (US).
2 Epoxy polyamide.
3 Extended planning annex.
4 Economic price adjustment (US contracting).
5 Experimental (or European) prototype aircraft.
EPAD Electrically powered actuation design.
EPAF European participating [rarely, partner] air
force[s].
EPAM, Epam Electronic pilot activity and alertness
monitor.
EPAS Expert process advisory set.
epaulettes In aviation, shoulder-mounted bages of rank
or seniority, in civil aviation the most senior having four
bars denoting captain of aircraft.
EPC 1 External power contactor, or connector.
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