Air France A330 vanishes off brazilian coast!

[timtomairways]

Tracker801 wrote:
Gentlemen,

It is dramatic enough this happened to a trustworthy plane, good airline but most of all all those aboard.

Shall we wait for a little more info from investigators and other people that know a lot more about aircraft instead of relying on media
reports from reporters that do not even have a single clue as to how an aircraft operates?
The fact that it is now on the ocean floor makes it already hard to come up with sufficient evidence. The clock is ticking now to find the
black boxes before they go silent.

about how long do the black boxes transmit that "im here" signal before the battery dies