ELT changes?
I've seen elt's fail because the antenna lead was ripped off the antenna at time of crash
I would like to see other methods trigger the ELT to transmit.
May I offer this:
Instead of JUST using impact G loads or even salt water emersion, how about: a timer.
During pre flight the timer is set for fuel exhaustion minus 30 minutes ( or anything you like ). It can be reset upon the ground (WOW switch for example) after safe arrival (do your checklists boys!)
But if you fly till fuel exhaustion time, its been sending out a signal for 30 minutes to aid in finding your plane.