3 ms·

I think everyone has pretty much agreed on 1.09 GHz for ADS-B. ADS-B isn't required for all aircraft but a substantial number of them are already using it. The

I think everyone has pretty much agreed on 1.09 GHz for ADS-B. ADS-B isn't required for all aircraft but a substantial number of them are already using it. The other aircraft (that will be required to use ADS-B) still have some time before it's mandatory (2017 in Europe and 2020 in the U.S., IIRC). Wasn't one of the issues with MH370 that some of the transponder equipment had been turned off?

dogma1138 11y ago
>Wasn't one of the issues with MH370 that some of the transponder equipment had been turned off? Yep the pilot according to the reports turned off the transponders and other radio equipment in the aircraft. The only thing that remained transmitting once it went silent was the Boeing diagnostic signal from the engines but that was discovered later and wasn't that helpful to begin with.