Originally Posted by
plhought
You're correct on the Xpndr. Does not function w/o AC. I'll edit my previous posts.
Essential DC is what I should have specified
You're correct.
If the transponder had been powered/working, and ATC had been able to locate the aircraft, could the situation have been salvaged (in other words, could they have been directed to the airport and made a successful landing)? If so, would it be worthwhile to provide some sort of battery backup power to the transponder?