On Oct 15, 1:19 pm, Ramy wrote:
Is there a reason why cambridge (as well as some other flight
recorders) do not use non volatile memory instead of a backup battery
which may die in the wrong time or pop out in a crash resulting in a
loss of the most critical clue of what happened??

Cambridge does, in the 302.

I suspect the cost of re-engineering the model 20 with more modern
innards was not cost effective considering the small market.

-Tom