Originally Posted by
SquintyMagoo
For God's sake, why don't the recorders have a battery back-up to prevent their stopping when the
engines go off for some reason. Much valuable information has been lost in many cases because
the recorders shut off due to engine fallure.
As somebody posted earlier, you need to run a lot of systems for the FDR to get the entire set of data. Not all of these systems are critical for operation under emergency electrical configuration.