Emergency Locator Transmitter (ELT)

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.

Source: PCG

Refer to:

  • 14 CFR Part 91