PJ2,
In this particular case, a "3g cutoff" would only have impeded recording the final bumps, not the initiating events.
But from what's been said here, one does start wondering about FDRs and CVRs... is enough being done to make sure they go on recording when they should?
Let's tread very carefully here, but ... for instance.... when the power to the FDR (CVR, QAR) disappears does that mean automatically everything else is already off-line?
CJ