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| Glossary |
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C •
D •
E •
F •
G •
H •
I •
K •
L •
M •
O •
P •
Q •
R •
S •
T •
U •
V •
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AVIATION TERMS AND ABBREVIATIONS |
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GAP
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The distance between two adjacent wings of a biplane or
multiplane.
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GCA
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Ground-Controlled Approach; part of ILS.
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GENERAL AVIATION
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That portion of civil aviation which encompasses all facets of aviation except air carriers holding a certificate of public convenience and necessity from the Civil Aeronautics Board and large aircraft commercial operators.
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GLASS COCKPIT
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Said of an aircraft's control cabin, which has all-electronic, digital and computer-based, instrumentation.
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GLIDER
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An un-powered aircraft capable of maintaining altitude only briefly after release from tow, then gliding to earth.
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GLIDE SLOPE
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(1) The angle between horizontal and the glide path of an aircraft. (2) A tightly-focused radio beam transmitted from the approach end of a runway indicating the minimum approach angle that will clear all obstacles; one component of an instrument landing system
(ILS).
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GPS
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Global Positioning System; satellite-based navigation.
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GREEN LIGHT |
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Approval for landing. A carryover expression from days when aircraft for the most part had no radios, and communication from a control tower was by means of a light-gun that beamed various green, red, and yellow signals to pilots in the air and on the ground.
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GROSS WEIGHT
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The total weight of an aircraft when fully loaded; Takeoff Weight.
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GROUND CONTROL
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Tower control, by radioed instructions from air traffic control, of aircraft ground movements at an airport.
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GROUND EFFECT
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Increased lift generated by the interaction between a lift system and the ground when an aircraft is within a wingspan distance above the ground. It affects a low-winged aircraft more than a mid- or high-winged aircraft because its wings are closer to the ground.
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GROUND SPEED
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The actual speed that an aircraft travels over the ground - its "shadow speed"; it combines the craft's airspeed and the wind speed relative to the aircraft's direction of flight.
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GYROPLANE
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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, usually a conventional propeller, is independent of the rotor system.
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