FAA approval for Variometer

[faselh]

I plan to install a Cambridge 302 Variometer (and logger).
For FAA approval I need to do file Form 337.
Does any body have this Variometer (or any other Variometer that uses Pitot and Pitot Static input) installed and approved by the FAA?
This would help me to get FAA approval.

Thanks

[Steve Sliwa]

I remember when I had my ASW-27 (STC'd) I researched if I needed a 337 for a vario installation and it was determined that I did not. I did get a mechanic to install it and sign it off. As I recall the argument was that it (a) it was not needed/required for the valid STC (day VFR), did not replace a required instrument, and the manual showed a hole in the instrument panel that said variometer.

I was surprised to read that others thought about getting a Form 337.

[faselh]

Steve,
the difference may be that your ASW-27 was "experimental" while the Ximiango FAA certified.

Hermann

[Steve Sliwa]

Hi Hermann

Actually, my ASW-27 was certified (STC'd) and I had the paperwork done by Embry-Riddle when I imported it. I am sure they were very careful.

I also remember that we switched variometers quite a bit in our certified Schweizer sailplanes as well.

Happy to hear if anyone had to get a 337 for switching variometers?

Steve

[Cliff Goldman]

Hi Hermann --
I have an Ilec SC7 vario installed by Depot Avionics of Alamosa, CO on a 337. The Ilec only connects to the TE probe, not the pitot or static. Will fax you a copy of the 337 if (1) it'll help and (2) you'll email me your fax number (I didn't keep it).

The Cambridge is good stuff. I'm going to stick with the Ilec and add a King AV8R in a snap-in panel mount with See You soaring software (It's the only hand-held GPS that will run See You) and an EW recorder (see the Cumulus Soaring website) when I get my RV-7A sold.
Cliff Goldman