Re: RAT for CVR

Date:         05 Oct 98 00:26:12 
From:         westin* (Stephen H. Westin)
Organization: Program of Computer Graphics -- Cornell University
References:   1 2
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"S.L." <look@the.sig> writes:

> David Lesher wrote:
> > There are very valid reason for not putting the CVR onto the
> > last-chance emergency battery bus, but how about on its own
> > deployable ram air turbine?

> No, it shouldn't be on a bus at all, nor on a RAT. It *should* have an
> internal lithium battery backup so that it will continue operating even
> if you rip it out of the aircraft, IMHO :-) So should the DFDR- even if
> its inputs lose power and fall off-line, the recorder itself shouldn't
> be the weak link.

Except, of course that you really *want* the CVR (and FDR) to stop at
the right moment. They are loop recorders, after all, and you don't
want one to spend a week under water continuously re-erasing
information from the crash.

So presumably you want it to stop at the point where it's ripped out
of the aircraft.

-Stephen H. Westin
Any information or opinions in this message are mine: they do not
represent the position of Cornell University or any of its sponsors.