warning areas

warning areas
A warning area is an airspace of defined dimensions that contains activity that may be hazardous to nonparticipating aircraft. The purpose of such warning areas is to warn nonparticipating pilots of the potential danger. A warning area may be located over domestic or
Warning area 401 extends from sea level to 27,000 ft above mean sea level from 0800 to 1800 h local time from Mondays to Saturdays international waters or both. In the United States, it extends from 3 NM outward from the coast.

Aviation dictionary. 2014.

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