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essential items
essential items Shaft-driven accessories whose failure
would bring about termination of the flight, examples
being fuel and oil pumps. Drive-shafts to these items do
not incorporate deliberate weak lines.
ESSI Enhanced special structural inspection.
ESSL Emergency speed select lever.
ESSP 1 European Satellite Services Provider [F,
DSNA; G, DFS; I, ENAV; Portugal, NAV; Spain,
AENA; Switzerland, Skyguide; UK, NATS]. (Int. 2005-).
2 Efficient small-scale propulsion.
ESSS, ES 3 1 External stores support system.
2 Electronic sensors and systems sector.
Esswacs Electronic solid-state wide-angle camera
system.
EST 1 Eastern Standard Time (US).
2 En-route support team (USAF).
3 See E&ST.
4 Elevation, slope, temperature.
5 Estimate[d].
ESTA Electronically scanned tacan antenna.
establish To achieve a steady state. In particular see
next.
established Aircraft confirmed as being stable at a
prescribed flight condition, notably at a given FL or on a
particular glidepath.
ESTAe École Spéciale de Travaux Aéronautiques (F).
ESTC European Space Tribology Centre.
Estec European Space Research and Technology
Centre.
Esteem Elaboration of a strategy for the transition from
Eatchip Phase III to EATMS (Euret).
Ester EO sensor technology and evaluation research.
ester Compound which reacts with water, acid or alkali
to give an alcohol plus acid; important in many aerospace
lubricants and other materials.
ESTL European Space Tribology Laboratory (ESRO).
ESTOL, EStol Extremely STOL.
ESU 1 Electronic storage unit.
2 Emergency supply unit.
e.s.u. Electrostatic unit 2.998 × 10 -6 wb/m 2 .
ESV Enhanced synthetic vision [S adds system, but
Kollsman has registered ESViS].
ESVN Executive secure-voice network (US civil govt.).
ESWL Equivalent single-wheel load[ing] (of multiwheel
landing gear).
ET 1 Emergency technology.
2 Extraterrestrial.
3 External tank.
E T Elastic tangent [longtitudinal] modulus; in US often
E t .
e t 1 Tensile strain.
2 Thermal efficiency.
3 Environmental sensor unit.
ETA 1 Estimated time of arrival.
2 Estimated time of acquisition.
3 Ejector thrust augmentation.
4 Effective turn angle.
ETAC 1 Enlisted tactical air controller[s].
2 Engin tactique anti-chars (F).
ETACCS European theatre air command and control
study.
ETADS Enhanced transportation automated data
system.
Etalon Small interferometer which reflects/refracts laser
ETL
light to form interference pattern giving unique signature,
rejecting all other sources.
ET&E European test and evaluation (USAF).
ETAP European technology acquisition plan, or
programme.
eta patch Fan-shaped patch of fabric and webbing
secured to aerostat envelope to provide attachment for a
cable eyelet.
e-Taws Early, or embedded, terrain-awareness warning
system.
ETB 1 Engineering [and] Technology Board (UK
Engineering Council).
2 End of block (ASCII).
3 Engineering test band.
ETBE Ethyl-tertiary butyl ether.
ETBS Etablissement Technique de Bourges (F).
ETC 1 Environmental Test Centre (Foulness, UK).
2 Electro-thermal chemical.
3 Erroneous track change (FDR).
4 European Travel Commission [office, B-1000] (Int.).
5 Equipment trust certificate, for financing new equipment.
ETCAS, E-TCas Enhanced traffic-alert and collisionavoidance
system.
ETCS Expeditionary tactical communications system
(MCWL).
ETD 1 Estimated time of departure.
2 Explosive[s] trace detection, or detector.
3 Expendable towed decay.
ETE 1 Estimated time en route.
2 Environmental test and evaluation.
ETEB Engineering Test and Evaluation Board (US).
ETEC Expendable turbine engine concept.
ETES Exotic threat-emitter system.
eTES Enhanced total entertainment system.
ETF 1 Electronic time fuze.
2 Enhanced tactical fighter.
3 Engine test facility.
4 Engineering task force.
ETG 1 European Tripartite Group.
2 Electronic target generator.
Ethernet Ether-net, yet uses coaxial cable or twisted pair
of wires to link IEEE-802 radar images or data at