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GADS
GADS Generic aircraft display system.
GAF German air force [UK usage].
Gafact German air force ATM co-ordination tool.
Gafor General-aviation forecast for VFR, met. briefing
service in many European countries.
G/A/G Ground to air to ground.
gage Gauge (US).
gaggle Group of aircraft (say, five to 20) flying together
but with no semblance of formation.
GAIN, Gain Global aviation [or analysis and] information
network (US, collects safety information).
gain 1 General term for increase in signal power in
transmission, usually expressed in dB.
2 Increase or amplification; antenna * (* factor) is ratio
of power transmitted along beam axis to that of isotropic
radiator transmitting same total power; receiver * (video
*) is amplification by receiver. Calculation for radars is
usually equal to area of sphere of unit radius divided by
area subtended on that sphere by solid angle equal to the
3-dB beam.
Gains, GAINS GPS air-data [or aided] laser inertial
navigation system.
GAIS General ATC information system [mainly Wx].
GAIT 1 General aviation infrastructure tariff
(Australia).
2 Ground-based augmentation and integrity.
gaiter Fireproof flexible cover over a pipe or tube, e.g.
to prevent ingress of abrasive dust.
Gal, gal Non-SI unit of small acceleration, gal (Galileo)
= 10 -2 ms –2 = 1,000 mgal.
gal Gallon, type not specified.
GALAT, Galat Groupement Aviation Légère de
l’Armée de Terre (F).
GALCIT Guggenheim Aeronautical Laboratory,
Caltech.
galena Lead sulphide, PbS, used in IR cells.
Galerkin One of the most rigorous methods of solving
structural dynamics problems.
gallery 1 Gas-turbine fuel manifold.
2 Fluid conduit formed within three-dimensional
volume of material, eg drilled through body of pump.
galley Aircraft kitchen with provision for heating
prepacked meals.
galling Pitting or marring of finished surface, esp.
bearing surface, because of fretting.
gallium White metal, Ga, density 5.9, MPt 29.78°C, *-68
radionuclide of half-life 68 min.
gallon Non SI unit of liquid volume. Imperial * =
4.546087 litres = 277.42 cu in = 1.20095 US *; US* =
3.785412 litres = 231 cu in by definition = 0.83267
Imperial *.
galvanic corrosion Electrolytic action caused by contact
of dissimilar metals or formation of oxygen cell in contact
with metal.
galvanising Coating of metal, esp. steel sheet, by dipping
in bath of molten zinc; protects from galvanic corrosion.
galvanometer Instrument which measures electric
current passed through pivoted coil in magnetic field.
With shunted external resistance, used as ammeter; with
series resistance, voltmeter.
GAM 1 GPS-aided munition[s].
2 Ground-attack missile.
3 Ground-to-air missile, = SAM.
4 German army [UK usage].
GAPE, Gape
GAMA General Aviation Manufacturers’ Association
Inc. [1970–; office, Washington, DC20005] (US).
GAMAA Gate management and airport analysis (software).
Gambica Association for the instrumentation, control
and automation industry [London SE1 7SW] (UK).
Gambit General anti-material [US materiel] bomblet
with improved terminal effects.
GAME Generalised automated maintenance environment
(USN).
Game GPS approach-minima estimator.
Games GPS anomalies monitoring equipment suite.
GAMM Generalised air (or airlift) mobility model,
baseline study using real military cargo spectrum (USAF,
USA).
gamma 1 γ, ratio of specific heats of gas.
2 Logarithmic function; ratio of contrast of transmitted
scene to that of received display.
3 Flight path angle.
4 SI unit of very small changes in magnetic flux density;
* (not abbr.) = 1nT.
gamma r , γ r Ratio of viscous damping to critical damping.
gamma plot Flight path angle plotted against airspeed.
gamma rays High-energy, short-wavelength EM radiation;
very penetrating, similar to X-rays but nuclear in
origin and usually more energetic. Symbol γ.
GAMS General airline management simulation.
Gamta, GAMTA General Aviation Manufacturers and
Traders Association [merged 2004 into BBGA, staying in
same Aylesbury office] (UK).
GAN Global area network.
GaN Gallium nitride.
G&C Guidance and control.
gang drill Series of drill presses in close proximity on one
bed, or drills operated simultaneously through interconnected
chucks.
gang start All [multiple] engines start simultaneously.
gantry Large crane for erection and servicing of launch
vehicles; * straddles vehicle and runs on tracks crossing
launcher and work area.
GANTT General Agreement on National Trade and
Tariffs.
GAO 1 General Accounting Office (US).
2 Government Accountability Office (US).
3 Groupe Aérien d’Observation (F).
GAP/Gap 1 General-aviation propulsion (NASA/
industry).
2 GPS airborne pseudolite.
3 Ground-accident prevention (FSF).
4 Gas analysis package.
gap Distance between chords of any two adjacent superimposed
wings of same aircraft, measured perpendicular
to chord of upper wing at any point on its leading edge.
GAPA 1 Ground-to-air pilotless aircraft.
2 General Aviation Pilots’ Association (US).
Gapan Guild of Air Pilots and Air Navigators [ 1
October 1929, livery company of City of London since
1936; office, London WC1R 5DJ] (UK).
gap coding Precise gaps in radio transmissions, or intervals
of silence, used to represent letters, words or phrases.
GAPCU Ground and auxiliary power control unit,
combines GPCU/APU-GCU.
GAPE, Gape General-aviation pilot education (FAA).
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