GAMET area forecast. An area forecast in abbreviated plain language for low-level flights for a flight information region or sub-area thereof, prepared by the meteorological office designated by the meteorological authority concerned and exchanged with meteorological offices in adjacent flight information regions, as agreed between the meteorological authorities concerned.
Gain-to-noise temperature ratio. The ratio, usually expressed in dB/K, of the antenna gain to the noise at the receiver output of the antenna subsystem. The noise is expressed as the temperature that a 1 ohm resistor must be raised to produce the same noise power density.
Geodesic distance. The shortest distance between any two points on a mathematically defined ellipsoidal surface.
Geodetic datum. A minimum set of parameters required to define location and orientation of the local reference system with respect to the global reference system/frame.
Geoid. The equipotential surface in the gravity field of the Earth which coincides with the undisturbed mean sea level (MSL) extended continuously through the continents.
Geoid undulation. The distance of the geoid above (positive) or below (negative) the mathematical reference ellipsoid.
General aviation operation. An aircraft operation other than a commercial air transport operation or an aerial work operation.
Glide path. A descent profile determined for vertical guidance during a final approach.
Glider. A non-power-driven heavier-than-air aircraft, deriving its lift in flight chiefly from aerodynamic reactions on surfaces which remain fixed under given conditions of flight.
Glider flight time. The total time occupied in flight, whether being towed or not, from the moment the glider first moves for the purpose of taking off until the moment it comes to rest at the end of the flight.
Go-around power or thrust setting means the maximum allowable in-flight power or thrust setting identified in the performance data.
Government Check Pilot (GCP). A DGCA inspector authorized to perform flight checks. Gray (Gy). The energy imparted by ionizing radiation to a mass of matter corresponding to 1 joule per kilogram.
Gregorian calendar. Calendar in general use; first introduced in 1582 to define a year that more closely approximates the tropical year than the Julian calendar.
Grid point data in digital form. Computer processed meteorological data for a set of regularly spaced points on a chart, for transmission from a meteorological computer to another computer in a code form suitable for automated use.
Ground earth station (GES). An earth station in the fixed satellite service, or, in some cases, in the aeronautical mobile-satellite service, located at a specified fixed point on land to provide a feeder link for the aeronautical mobile-satellite service.
Ground handling. Services necessary for an aircraft’s arrival at, and departure from, an airport, other than air traffic services.
Ground-to-air communication. One-way communication from stations or locations on the surface of the earth to aircraft.
Ground visibility. The visibility at an aerodrome, as reported by an accredited observer.
Gyrodyne means a rotorcraft whose rotors are normally engine driven for takeoff, hovering, and landing, and for forward flight through part of its speed range, and whose means of propulsion, consisting usually of conventional propellers, is independent of the rotor system.
Gyroplane means:
(1) A heavier-than-air aircraft supported in flight by the reactions of the air on one or more
rotors which rotate freely on substantially vertical axes.
(2) a rotorcraft whose rotors are not engine driven, except for initial starting, but are made to
rotate by action of the air when the rotorcraft is moving; and whose means of propulsion,
consisting usually of conventional propellers, is independent of the rotor system.
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