Emergency Locator Transmitter (ELT)

Definitions

• A small, self-contained radio transmitter that will automatically, upon the impact of a crash, transmit an emergency signal on 121.5, 243.0, or 406.0 MHz.
• 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.) (Refer to AIM.)

References

• Airplane Flying Handbook, Federal Aviation Administration, 2021
• Pilot Controller Glossary, Federal Aviation Administration, 2023
• Weight-Shift Control Aircraft Flying Handbook, Federal Aviation Administration, 2008