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enhanced vision system
≤60 s aural/visual warning [in addition to normal GPWS
output] and also displays terrain map showing clearance
ahead.
enhanced vision system 1 Uses dual-band IR camera to
project conformal image of scene ahead on to HUD,
allowing approach to continue from 200 to 100 ft (30 m)
decision height.
2 Another provides HUD-system to input Flir and/or
MWR(1).
ENJJPT Euro-NATO Joint Jet Pilot Training.
ENK, ENNK Endo-atmospheric non-nuclear kill.
ENNA Enterprise Nationale de la Navigation Aérienne
(Algeria).
ENOC Engineering network operation center.
enplanement Boarding by one passenger (US).
Enq Enquire.
ENR En-route, also ENRT.
ENRI Electronic Navigation Research Institute (Sendai,
Japan).
enrichment 1 Adjustment by piston engine mixture
control to produce richer mixture.
2 Artificial increase in percentage of isotope; thus,
enriched uranium contains more than natural 0.75% of
fissile U235.
en route 1 Between point of departure and destination.
2 Portion of flight on airways or desired track,
excluding initial departure and approach phases.
en-route automated radar tracking system A step beyond
ARTS IIIA with improved digital-display radars and failsafe
features (FAA).
en route base Air base between origin and destination of
air force mission which has capability of supporting
aircraft operating route.
en route clearance Valid to destination, either to joining
stack or coming under approach control.
en route climb Climb to designated FL or cruising altitude
on desired track.
en route height See cruise altitude.
en route support team Selected personnel, skills, equipment
and supplies necessary to service and perform
limited specialised maintenance on tactical aircraft at en
route base (USAF).
en route time Time en route (1), normally measured
from initial cruise altitude to TOD.
en route traffic control service Provided generally by
ATC centres, to aircraft on IFR flight plan operating
between departure and destination terminal areas.
ENRT En route.
ENS Euler/Navier-Stokes.
ENSA École Nationale Supérieure de l’Aéronautique
(F).
ENSAE New designation of ENSA, with addition of “et
de l’Espace”. Now more commonly called Supaéro.
ENSCE, or Ensce Enemy situation correlation element
(US, intelligence).
Ensieta École Nationale Supérieure des Ingénieurs des
Etudes et Techniques d’Armement [F-29806 Brest] (F).
ENSIP, Ensip Engine structural integrity program
(USAF).
ENSMA Ecole Nationale Supérieure de Mécanique et
d’Aéronautique (F).
ENSO El Niño southern oscillation.
Ensolite Very wide range of closed-cell foams made
envelope
chiefly from VN (vinyl/nitrile PVC NBR rubber) or
Neoprene; many applications (Uniroyal).
Entel Empresa Nacional de Telecommunicaciones
(Argentina, Chile, etc).
Enterprise caching technology Combines VDA,
APC(10) and selective caching in order to prevent superfluous
data from being sent over electronic
communications.
ENTG Euro/NATO Training Group.
enthalpy Total energy (heat content) of system or
substance undergoing change from one stage to another
under constant pressure, expressed as H = E + PV, where
E is internal energy, P pressure and V volume; another
expression is Q = V + pV. See specific *.
entity Radar-detected aircraft seen on screen.
entomopter Flying machine based on insect aerodynamics.
ENTR Entire.
entrainment Sucking-in of induced fluid flow by highvelocity
jet through duct.
entrance cone Portion of Eiffel-type tunnel upstream of
working section.
entrant Start-up airline, new to the market [opposite of
incumbent].
entropy 1 In physics and thermodynamics, measure of
unavailability of energy; symbol φ, or S, a measure of
energy per unit temperature J/K. Specific *, symbol s, is *
per unit mass kJ/kgK = 0.238846 Btu/lb°R; the reciprocal
is 4.186798. Thus, in irreversible process, such as occurs
in any real engine, * always increases. Any system or
process having constant * is said to be isentropic.
2 In communications theory, measure of information
disorder.
entry 1 Penetration of planetary atmosphere by spacecraft
or other body travelling from outer space.
2 Fore part of body or aerofoil, esp. wing.
entry corridor Limits of route through atmosphere
which returning spacecraft must follow. With too steep a
trajectory spacecraft would burn up; with too shallow,
spacecraft would bounce off atmosphere and be unable to
return.
entry fix Precise reporting point at entry to FIR or
control area, see next.
entry gate Point(s) of entry for incoming airways traffic
to TMA.
entry interface Point during re-entry at which returning
spacecraft encounters sensible atmosphere. Traditionally
(non-SI) = 400,000 ft.
entry level Not precisely defined, but most common
meaning is to describe small business jet, first to be bought
by customer, who may later change to more costly
replacement.
entry point 1 Ground position at which aircraft entering
control zone crosses boundary.
2 Where supersonic track crosses coast inbound.
ENU East/north/up co-ordinate system.
envelope 1 Of variable, curve which bounds values but
does not consider possible simultaneous occurrences or
correlations between different values.
2 Curve drawn through peaks of family of curves or
through all limiting valves.
3 Glass or metal casing of electronic tube.
4 Hot air or gas container of non-rigid aerostat.
5 Outer cover of airship.
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