FAA is formally revoking standards used to build emergency locator transmitter (ELT) equipment that transmit via the 121.5 MHz frequency, a move largely expected since the internationally supported Cospas-Sarsat satellite system stopped processing such signals in 2009. The Cospas-Sarsat program decided to drop 121.5 MHz because it proved unreliable with “poor accuracy and numerous false alerts,” FAA says, which from Dec. 1 will solely rely on 406 MHz frequencies to support ELTs. The 406 ...

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