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  • g Acceleration due to mean Earth gravity, that is of a body in free-fall; or acceleration due to rapid change of direction of flight path.
  • gallons Non-SI measure; 1 Imp gallon (UK) = 4.546 litres, 1 US gallon = 3.785 litres.
  • GAZ Gosudarstvennyi Aviacionnyi Zavod (state aviation plant in the USSR; for example, GAZ-64. The numbers indicate the sequence number assigned to aviation plant).
  • GFRP Glass fibre-reinforced plastics.
  • 'glass cockpit' Cockpit in which dial instruments are replaced by multifunction electronic displays.
  • glass fibre Spun molten glass; see GFRP.
  • glideslope Element giving vertical (height) guidance in ILS.
  • glove (1) Fixed portion of wing inboard of variable sweep wing; (2) additional aerofoil profile added around normal wing for test purposes.
  • GmbH Gesellschaft mit beschr√§nkter Haftpflicht (or Haftung) (German company constitution).
  • GPS Global Positioning System, US military/civil satellite-based precision navaid.
  • GPU Ground power unit (not part of aircraft).
  • GPWS Ground-proximity warning system.
  • green aircraft Aircraft flyable but unpainted, unfurnished and basically equipped.
  • gross wing area See wing area.
  • ground-adjustable pitch Propeller with blades that can be adjusted in pitch by an engineer on the ground. Compare flight adjustable and variable pitch.
  • GS See glideslope.
  • gunship Aircraft designed for battlefield attack; helicopter gunships normally with slim body carrying pilot and weapon operator only.
  • GUP Gosudarstvennoye Unitarnoye Predpriyatie (Russian State Unitary Enterprise).