EMERGENCY LOCATOR TRANSMITTER (ELT)
Pilot/Controller Glossary with JO 7110.65BB, Change 3, effective July 9, 2026 · Official text on faa.gov
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.
Refer to 14 CFR part 91; AIM.
Also called ELT.