DETRESFA - distress phase of search and rescue operation.
DF - direction indicator. A gyro instrument which indicates the magnetic heading of an aircraft.
DETRESFA (DISTRESS PHASE) [ICAO]- The code word used to designate an emergency phase wherein there is reasonable certainty that an aircraft and its occupants are threatened by grave and imminent danger or require immediate assistance.
DEVIATIONS- ...
 See also: Station, Emergency, Distress, Direct, Air traffic
  
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