Jim.. gliders and balloons and aircraft without an engine driven electrical
system are exempt from certain parts of FAR91.215, not required above
10,000MSL, not required in the ModeC veil around Class B (30nm and below the
ceiling of the local ClassB). But if you have one in the glider, "all
aircraft equipped with a transponder must have it operational at all times
they are airborne."

What the SSA "appears" to be looking for, is an "allowance" to turn the
transponder off when away from "high traffic areas" to save battery energy,
so they can still have an "operational transponder" that they can turn back
on when they return to the "high traffic volume area" instead of having a
dead battery, no radio and no glide computer.

BT

"Jim Phoenix" wrote in message
...

"Ian Cant" wrote

", and it just might open up an adverse review of our existing exemption."

I suppose I could go search for it myself, but I was wondering what
existing
exemption do we have? By "we" I presume you mean an exemption granted to
the
SSA? The external data plate exemption?

Jim