Emergency locator transmitter (ELT)

{
  "id": "MLC-T-AVN-000356",
  "term": "Emergency locator transmitter (ELT)",
  "field": "Aviation and air traffic control",
  "definition": "A radio transmitter attached to the aircraft structure which operates from its own power source on 121.5 MHz and 243.0 MHz. It aids in locating downed aircraft by radiating a downward sweeping audio tone, 2-4 times per second. It is designed to function without human action after an accident.",
  "abbreviation": "ELT",
  "references": [
    "14 CFR part 91",
    "AIM",
    "FAA Pilot/Controller Glossary"
  ],
  "url": "https://mlchart.com/terminology/aviation/emergency-locator-transmitter-elt/"
}