I had a similar problem in mine, then it got worse. Trouble was whenever
it was in the shop, it was working. Finally some guy thought to gently
heat gun the thing and found the failed part. I think it was a capacitor
that when warm, stopped working. It's had other problems too, like that
expensive final transistor going.

Just my experience....

John

skyav8r wrote:
Howdy,
I have an Aeromech 8140B20 encoding altimeter with a KT76 transponder.
Mode C is intermittent with ATC. Is it more than likely this is an
altimeter problem or transponder problem? Sometimes when it is not
reporting, i cycle the transponder off then back on and it starts
reporting again. Thanks in advance,
Brian
Also, sould an aeromech and aerosonic encoding transponder interchange
as far as the connections are concerned?