ELT
Here in Brazil, small a/c engaged in air-taxi/corporate operations MUST have at least one ELT, and operated by a G-Switch.
You can have as many manually operated ELTs you want, but at least one should have the G-Switch.
If this is true on much smaller a/c (including helicopters), I want to believe A300s also has one.
Supposing this is true, why not a beep was heard? ELTs transmit on 121.5, the freq. everybody is "listening" to, specially when crossing the "big lagoon"...