On Nov 21, 12:58*am, Ventus2NZ wrote:
I have just had my Winter 57mm altimeter fail it's instrument check.
From what I can ascertain, this is not all that uncommon. Does anyone
have any ideas or suggestions of a suitable 2-1/4" alternative.

Recertification of altimiters is only required if you plan on doing
some IFR flying, not likely in a glider. Just check it against all
the other altitude indicators you have in the modern cockpit, GPS,
Transponder, computer. I find the small altimiter a bit hard to read
at a glanse, so I leave the SN-10 cursor on altitude (double spaced)
on my home page. The small altimiter is just in there to comply with
the requirement to have a pressure altimiter in the cockpit. BTW, I
use the UMA non certified altimiter from Aircraft Spruce for about
$200 bucks.
Cheers,
JJ