uncertainty phase

uncertainty phase

A situation in which an uncertainty exists regarding the safety of an aircraft and its occupants. The code word for this phase is INCERFA. See also alert phase and distress phase.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
notified the ATSC (Air Traffic Services Centre) Duty Watch Supervisor and ARCC (Aeronautical Rescue Coordination Centre) that an Uncertainty Phase had existed.
'By then, the Radar Controller should have commenced full overdue action (not later than 30 minutes after the declaration of an Uncertainty Phase),' said the report, citing further the radar controller should have notified the local ARCC that an Alert Phase existed.