He says the transponder, ELT(whatever that is <img src="/ubbthreads/images/graemlins/blush.gif" alt="" />) and the VOR are OK. Don't need a lot of detail here guys, just something in the ballpark I can do some rough figuring with.
Several folks have quoted "2 years" as the standard time
between battery replacements on ELTs.
It depends.
The ACK units utilize standard Duracell "D" batteries.
The date on the side of the batteries becomes the limiting factor for these. I'm good until 2011!
If you have a transponder, it must be re-certified every two years. Flying without one is absurdly limiting.
