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effective helix angle
EGT
EFMCS Enhanced flight-management computer
effective helix angle Angle of helix described by point on
tically loaded.
exercise, P programme, S school.
effective propeller thrust Net propulsive force; propeller 2 Electronic funds transfer; S adds system.
thrust minus increase in drag due to slipstream.
EFU Emergency functions unit [air refuelling].
effective range Maximum distance at which weapon EFVS Enhanced flight vision system[s]. Allows aircraft
may be expected to strike target.
below MDA and DH when not on Cat. II or III straightin
approach (FAA).
effective sortie One which crosses the enemy frontier [see
sortie].
EFW Electric field and wave.
effective span Span minus correction for tip losses; EFX Expeditionary forces experiment (USAF).
usually defined as horizontal distance between tip chords. EGA 1 Exhaust-gas analyser.
effective terrestrial radiation Amount by which IR radiation
from Earth exceeds counter-radiation from EGAC Enhanced general avionics computer.
2 Excess ground attenuation.
atmosphere. Also called effective radiation or nocturnal EGAD Export Group for Aerospace and Defence
radiation.
(UK).
effective velocity ratio Based on dynamic pressures
Egads Electronic ground automatic destruct sequencer
button.
–– where q j is jet impingement stagnation pressure
EGAS European guaranteed access to space (five-year
qj
2003–07 plan requiring €1 billion).
propeller blade in flight through still air measured relative
to Earth.
system.
EFMS Experimental flight-management system
effective horsepower Power delivered to propeller.
(Phare).
effective pitch Distance aircraft advances along flightpath
EFOGS Enhanced fibre-optic-gyro missile.
for one revolution of propeller.
EFP 1 Explosively formed penetrator, or projectile.
effective pitch radio Basic propeller characteristic V/nd, 2 Engine fuel pump; MS adds and metering system.
where V is airspeed, n propeller rpm and d diameter, units EFPS Electronic flight-progress strip; D adds data.
being compatible.
EFRS Engine-failure recognition speed.
effective profile drag Difference between total wing drag EFS External fuel system (battlefield helicopter).
and induced drag of wing with same aspect ratio but ellip-
EFT 1 Elementary flying, or flight, training; E adds
EGASF European General Aviation Safety
(jet-lift ground effect).
Foundation.
effective wavelength That corresponding to effective
EGATS European Guild of Air Traffic Services.
propagation velocity.
EGB End-grain balsa.
effector 1 In any system, an output device.
EGBU Enhanced glide-bomb unit.
2 Any device used to manoeuvre a vehicle in flight, now
EGCU Electrical-generator control unit.
becoming popular in US as alternative to inceptor.
EGDN Ethylene-glycol dinitrate (a powerful explosive).
effects-based operations Selection of a series of targets in
eggbeater Helicopter with intermeshing rotors.
a particular order, to achieve a specific final result.
EGI Embedded GPS/INS.
efficiency Ratio of output to input, usually expressed in
EGIHO Expedited ground-initiated handoff.
percentage form. See overall, propulsive, thermal*.
EGIU Electric[al] generator interface unit.
efficiency of catch Proportion of total water droplets in
Eglin Florida, largest AFB, home of many facilities
path of aircraft which actually strike it.
including former APGC (USAF).
efflux Total composition of gas or other fluid flowing
EGME Ethylene-glycol monomethyl ether.
out from a device, except that in an engine with a propulsive
jet * excludes flows from auxiliary devices such as gation, overlay service, or system. European equivalent of
EGNOS, Egnos European geostationary new, or navi-
turbogenerators, heat exchangers and breathers.
WAAS. (EC, ESA, Eurocontrol).
effusion Flow of gas through holes sufficiently large for EGP Exterior-gateway protocol.
velocity to be approximately proportional to square root EGPWS, EGPS Ground-proximity warning system
of pressure difference.
prefix E originally embedded, now enhanced; now called
EFH 1 Earth far horizon.
TAWS.
2 Engine flight hours.
EGR 1 Engine ground run[ning].
3 Equivalent flight hours.
2 Embedded GPS receiver.
EFI Electronic flight instruments, or instrumentation; S egress 1 Procedure for getting out of spacecraft in orbit
adds system; 8×8 colour CRTs.
or after planetary or lunar landing, whether for working
EFIC Electronic flight-instrument controller.
in space or any other reason. Begins with putting on
EFIDS European flight-information display system. spacesuits, and includes depressurizing and opening
EFIP Electronic flight-instrument processor; CP adds hatch.
control panel.
2 Departure of combat aircraft from target area.
EFIS See EFI; CP adds control panel.
egress handle Handle which fires ejection seat.
EFIT Engineer, furnish, instal and test.
EGS 1 Elementary gliding school.
EFL 1 Emitter function logic.
2 Exfoliation galvanic stress.
2 External-finance limits.
EGSE Electrical ground support [or station] equipment.
EFM 1 Enhanced fighter manoeuvrability, e.g. with
TVC and RCFAM.
EGT Exhaust-gas temperature, measured immediately
2 Engine fleet management.
downstream of turbine[s] or exhaust valve.
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