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nd
Edition – Rev 0
25-30
ELT – DESCRIPTION AND OPERATION
25-30 EMERGENCY LOCATOR TRANSMITTER (ELT)
DESCRIPTION AND OPERATION
Emergency locator transmitter ELT is postioned in baggage compartment, on the upper
floor. In the event of crash ELT activates automatically (automatic fixed ‘EF’
configuration), and transmits the standard swept ton on 121.5 MHz lasting until battery
power is gone. This 121.5 MHz signal is mainly used to pinpoint the beacon during search
and rescue operations.
In addition, for the first 24 hours of operation, a 406 MHz signal is transmitting at 50-second
intervals. This transmission lasts 440 ms and contains identification data programmed into
the beacon and is received by COSPAS-SARSAT satellites. The transmitted data is
referenced in a database (maintained by the national authority responsible for ELT
registration) and used to identify the beacon and owner.
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