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extension contract
2 Propeller blade with root extended in chord.
extension contract Industrial contract formed as extension
of previous contract in either scope or timing.
extension flap See area-increasing flap.
extensometer Instrument for measuring small amounts
of deformation.
external aileron Aileron mounted clear of wing surfaces
but deflected conventionally.
external augmentor Generalised description for
arrangements which use high-energy primary flow to
entrain ambient airflow remote from source of power, as
in ejector lift.
external check See externals 1.
external energiser Portable motor used to supply motive
power to engine inertia starters.
external gearbox That attached outside the casing of a
gas-turbine engine, providing drives for accessories,
usually from HP shaft, and connector for hand-turning.
More often called the accessory gearbox.
external input System input from source outside system.
external lighting Some aircraft have none. Usually *
serves two functions: to render the aircraft visible from
other aircraft at the same level from the greatest possible
distance [see navigation *] and to illuminate the ground
ahead when taxiing or under tow. Other species include
ice-warning, airline-logo and air-refuelling guidance.
externally blown flap Flap in wake of main engine[s]
when deflected, thus having greatly enhanced effect esp.
in increasing lift.
externals 1 External inspection of aircraft carried out by
pilot [if necessary with other crew members] before
boarding.
2 Complete gas-turbine engine apart from the core, i.e.
fuel and lubrication systems, accessories, starting system,
etc.
external storage EDP (1) storage media separate from
machine but capable of retaining information in form
acceptable to it.
external supercharger Impeller (manifold-pressure
booster) located upstream of carburettor.
extinction 1 Attenuation of light through absorption
and scattering.
2 Cessation of combustion (see flameout).
extinction coefficient In meteorology, space rate of
diminution of transmitted light; attenuation coefficient
applied to visible radiation.
extraction 1 To recover friendly troops from hostile
location.
2 To take shaft power from engine for performancemeasuring
purposes.
extraction parachute Extracts cargo from aircraft and
deploys main parachutes.
extraction zone Specified ground area upon which
Eytie
supplies are delivered by extraction technique from lowflying
aircraft.
extractor 1 Part of firearm which engages rim or base of
cartridge to pull it from chamber.
2 Computer-controlled device for automatic initiation
and maintenance of all desirable radar contacts in ATC
or air-defence system.
extraordinary magnetoresistance Fantastic increase in
resistance of superplastics in extremely powerful magnetic
fields.
extra section Extra flight by airline to take overflow of
fully booked flight.
extravehicular activity See EVA.
extremely high frequency 30–300 GHz.
EXTRM Extreme.
extrusion Hot or cold forming of metals, rubbers and
plastics by forcing through die of appropriate crosssectional
shape.
Extv Extensive,
ExW Explosive welding.
E o , E x zero Elastic modulus of composite panel in direction
of fibres.
e y Lateral distance between jet centrelines.
EYE European Young Engineers (Int.).
eye In centrifugal compressor, that portion through
which fluid enters.
eyeball 1 Passenger-controlled spherical valve outlet for
fresh air, usually overhead.
2 To search visually, or keep eyes on a target (colloq.).
eyeball design Design by eye, without calculation.
eyeballs down Jargon for severe positive acceleration.
eyeball/shooter Manoeuvre in which lead fighter flies
across to identify target visually, while wingman (shooter)
remains able to fire BVR.
eyeballs in Acceleration from behind when subject is
seated upright, or below when prone [best].
eyeballs out Decceleration when subject is seated
upright [worst].
eyeballs up Negative-g, downward acceleration.
eyebrow panel Panel of instruments or controls in flight
deck roof, above and behind windscreen.
eyebrow window In roof of flight deck, also called VIT
window.
eyelids Jet-engine reverser or afterburner nozzle halves
similar to eyelid in appearance and action.
eye patch Worn over one eye by all members of crew of
aircraft about to drop live NW or launch missile with NW
warhead.
eye reference point Actual or notional position in three
dimensions of an eye, or mean of both eyes, of pilot
looking ahead, especially during landing.
eye relief Distance from eyeball to NVG eyepiece or
image of HMD.
Eytie Italian [noun and adjective, collaq.} (WW2).
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