GL has various meanings in the Importation category. Discover the full forms, definitions, and usage contexts of GL in Importation.
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. A popular phrase, "3 green lights," refers to the instrument panel lights verifying that all three gears (in a tri-gear aircraft) are down and locked for safe landing.
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