[neurotech1]

A combination of Enhanced Ground-Proximity Warning System (EGPWS) http://en.wikipedia.org/wiki/Ground_proximity_warning_system and Deployable Flight Incident Recorder Set (DFIRS) http://www.drs.com/Products/c3a/DFIRS.aspx might be an option. The DFIRS deploys when a pilot ejects from a F/A-18 Hornet. Using EGPWS in a civilian aircraft the system only triggers when a crash is imminent.

An alternative would be to eject the DFIRS when subjected to high acceleration like an Airbag in a car. In a large proportion of crashes, the nose of the jet hits first.