aircraft proximity

A situation in which, in the opinion of a pilot or air traffic service personnel, the distance between two or more aircraft, as well as their relative positions and speeds, may have compromised their safety. An aircraft proximity is classified as risk of collision when a serious risk of collision has existed; safety not assured when the safety of aircraft may have been compromised; no risk of collision when no risk of collision has existed; and risk not determined when insufficient information was available to determine the risk involved or inconclusive evidence precluded such determination. The code word used to indicate aircraft proximity is AIRPROX. All cases of aircraft proximity must be reported.

Aviation dictionary. 2014.

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