An Emergency Locator Transmitter (ELT) can be installed on an aircraft either as a permanent or portable unit.

A permanently installed ELT is typically located near the tail and connected to an outside antenna. The ELT is automatically activated by an impact switch in the event of a crash.

A portable version, having been removed from its bracket and connected to its auxiliary antenna, becomes a survival beacon.

The ELT operates on three frequencies: 121.5MHz, 243.0MHz and 406MHz.

ELTs offer:
- Global coverage
- Precise pinpointing (to within 1NM, or less, if required)
- Identification of the aircraft indistress (the ELT transmits a unique aircraft identification code)
- Minimum maintenance: maintenance is limited to a monthly "self test" and battery replacement every six years.


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