INCERFA

INCERFA

The code word to designate an uncertainty phase (ICAO). It is a situation in which there is uncertainty as to the safety of an aircraft and its occupants.
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After the Mauritius ATC activated the uncertainty code"INCERFA"-- used for the phase where uncertainty exists regarding the safety of an aircraft and its occupants -- the flight came in contact with the Mauritius ATC at 4.58 pm and landed later.
The Mauritius Air traffic control (ATC) room had activated INCERFA, the code used by the aircraft controllers during a phase of uncertainty, when Swaraj's plane crossed over from Indian air space to Male Air Traffic Control, Airports Authority of India confirmed.
While all contacts were lost at 6.18 a.m., an INCERFA (the declaration that the plane was uncertain) was declared only at 7.29 a.m.