[LINK] Malaysia Airlines Flight 370, From Wikipedia, the free encyclopedia

[Scott Howard]

On Tue, Mar 18, 2014 at 7:57 PM, Marghanita da Cruz <marghanita at ramin.com.au
> wrote:

> I find it amazing that these planes aren't fitted with some kind of
> beacon, independent of the comms.
>

They are - it's called a transponder, and the 777 has two of them
configured in a redundant manner - if one dies, the other automatically
takes over.

They also have multiple different beacons that activate under certain
conditions, such as when they get wet - but of course that would only occur
if it actually crashed.

  Scott