When is an ELT required to be replaced or recharged?

An Emergency Locator Transmitter (ELT) is a crucial safety device designed to help locate downed aircraft. The requirement for replacing or recharging the ELT primarily revolves around the cumulative use time of its battery. Specifically, the ELT must be replaced or recharged after 1 hour of cumulative use. This guideline ensures that the ELT remains functional and can be effectively utilized in an emergency situation.

The rationale behind this requirement is based on the performance capacity of the battery within the ELT; prolonged use diminishes its reliability and signal strength. Maintaining the ELT's functionality is vital for maximizing the chances of search and rescue operations being successful. It is also standard practice in aviation safety protocols to regularly check and maintain such equipment to ensure readiness when needed.