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GDB
2 General Duties branch, which includes aircrew
(RAF).
3 Geometric dimensioning, & T adds and tolerancing.
GDB Ground data-bus.
GDC Gyro display coupler.
GDE 1 Gas-discharge element, light source.
2 Graphics differential engine.
3 Ground demonstrator engine.
GDI Get-down-itis, dangerous desperation to land for
whatever reason.
GDL 1 Gas-dynamics laboratory, pioneer rocket
research centre (USSR).
2 Gas dynamic laser.
3 Ground data-link; P adds processor.
GDM Generalized development model.
GDOP Geometric[al] dilution of precision, also
expressed as geometrical degradation of performance.
GDP 1 See GDOP.
2 Graphics drawing processor.
3 Ground delay program.
GDPA Ground distributed processing station.
GDS 1 Ground debriefing station.
2 Global decision support, controls worldwide airlift; S
adds system (USAF).
3 Global, or general, distribution system (Sita).
4 Goldstone.
GDT Ground data terminal.
GE 1 Groupe d’entraînement (F).
2 Gigabit ethernet.
G/E Graphite/epoxy.
Ge Germanium.
G e Gain, especially of radar jammer system.
GEANS Gimballed electrostatic aircraft navigation
system; GEAINS adds inertial.
gear Landing gear (colloq.).
gear change In powered flight-control system, traditionally
effected [automaticially, with manual standby] by
moving fulcrum or radius of an operating rod according
to IAS or Mach.
geared engine Piston engine with reduction gear to turn
propeller more slowly than crankshaft, to enable power to
be increased whilst not overspeeding propeller.
geared fan Fan (2) driven through reduction gear.
geared propeller See geared engine.
geared supercharger Piston engine supercharger driven
through friction clutch and step-up (speed-increasing)
gears.
geared tab Balance tab mechanically linked to control
surface so that its angular movement is determined by that
of main surface.
gear-type pump Two intermeshing gears in close-fitting
casing which pump fluid round outside of each gear in
spaces between successive teeth and outer casing.
GEASA Group of experts on aviation safety and
assistance.
Gebecoma Groupement Belge des Constructeurs de
Matériel Aérospatiale [office, Brussels B-1130] (Belgium).
GEC Graphite epoxy composite.
GeCu Germanium/copper (IR detector).
GEE Ground exploitation, or evaluation, equipment.
Gee Pioneer precision navaid, using interrelated VHF
pulses transmitted from ground stations; position of
aircraft determined by observing intervals between pulses
from pairs of stations and plotting on hyperbolic map.
General Flying Test
Gee-H Secondary-radar navaid which enabled aircraft
to determine position with precision by simultaneously
measuring distances from two beacons.
GEEIA Ground Electronics Engineering Installation
Agency (USAF).
GEF General Engineering Flight (RAF).
Gefra Group of experts on the future regulatory
arrangements [for international air transport].
gegenschein Faint light area of sky opposite Sun and
celestial sphere; believed to be reflection of sunlight from
particles beyond Earth’s orbit.
GEH Graphite-epoxy honeycomb.
GEI Groupement d’Economique Interêt (see GIE,
which is more common).
Geiger counter Geiger-Müller gas-filled tube containing
electrodes; ionising radiation releases short pulse of
current from negative to positive electrode, frequency of
pulses indicating intensity of radiation.
GEJ Group of Experts on Jurisprudence (ICAO).
GEL Graphite-epoxy laminate.
GELIS, Gelis Ground-emitter location and identification
system.
GEM 1 Ground-effect machine (ACV).
2 Generic electronics module.
3 Graphite epoxy (solid rocket) motor.
4 Ground-environment material.
5 Generalized emulation of microcircuits.
6 Guided, or guidance, enhanced missile.
7 Graphic [piston-] engine monitor, typically pictures
CHT and EGT.
8 GPS-embedded module.
GEMS, Gems 1 Grouped engine monitoring systems.
2 Global environment management system (noise).
3 Global expeditionary medical system (USAF).
4 Generic Earth-station management system.
GEN 1 Generator.
2 General [not the rank].
3 General information (AIP).
Gen, gen 1 Information, latest knowledge (colloq. RAF
WW2).
2 Generation, a complete phase of development.
Gen2, Gen 3 New ‘generations’ of helicopter visionics.
genav General aviation.
GENE, Gene GPS – enhanced navigation equipment.
general air traffic All traffic excluding OAT (3), special
military (eg lo-level training) and local pleasure flights not
notified for ATC purposes.
general-arrangement drawing Usually three-view (front,
side, plan) outline, in some cases with addition of dimensions,
ground line, and broken lines giving additional
information.
general aviation All civil aviation except air transport
for hire or reward; largest sectors are private (including
company transport), agricultural and aerial work. Term
introduced in US by CAA in 1951.
General Belgrano Head office of the CAA [colloq.]
(UK).
general cargo Loose items, excluding large unit loads,
not containerized or palletized.Head office of the CAA
[colloq.] (UK).
general inference General meteorological situation and
future forecast.
General Flying Test Taken at different levels by candidates
for PPL, BCPL and CPL.
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