alert phase

alert phase
A phase that begins when apprehension exists about the safety of an aircraft and its occupants, after the uncertainty phase, and a communications search has failed to reveal any news of the aircraft; or an aircraft has been cleared to land and fails to land within 5 min after the estimated time of landing and communication has not been reestablished with the aircraft; or information has been received that indicates that the operating efficiency of the aircraft has been impaired but not to the extent that a forced landing is likely. The code word used to indicate this phase is ALERFA.

Aviation dictionary. 2014.

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