Everythings possible mate.
Until the facts are known its just pure speculation. All im saying is HF is commonly used on oceanic crossings like this one.
Some places are seeming to focus on the fact that Brazilian ATC system isnt one of the better ones in the world as evidenced by Gol 738 mid air with a biz jet in 2005 and so CPDLC might not even be a factor here- I'm not exactly sure what facilities they have on east coast of Brazil however.
Latest info from avherald and ill quote poignant excerpts
Quote:
Sources within Air France reported, that the automatic message did not only report an electrical short circuit, but also the loss of cabin pressure. This information has been confirmed by Forca Aereas Brasileira.
Brasilian government sources report, that the airplane also disappeared from military radars (primary radars), that do not depend on transponder signals.
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