Distress Signal. Civil aircraft in danger and in need of immediate assistance have international signals laid down for use.
They are:
Radio-telegraphy: S.O.S.
Though the Mayday distress signal can be transmitted over any frequency aircraft have special frequencies that are specifically for distress calls. The frequency 121.
Mayday
The international radiotelephony distress signal. When repeated three times, it indicates imminent and grave danger and that immediate assistance is requested. (It originally comes from the French words: m'aider, which means: 'to help me') ...
Marker Beacon - Electronic navigation facility transmitting a 75 MHz vertical fan shaped radiated pattern
Mayday - International radiotelephony distress signal
MEDEVAC - Medical Evacuation Flight
MEL - Minimum Equipment List
MHz - Megahertz ...
 See also: Aircraft, Distress, Stress, Landing, Pilot
  
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