On Friday, June 1, 2018 at 6:01:43 PM UTC-7, Charles Longley wrote:
One of our Pawnees has an ADSB out transponder now. (Evergreen Soaring) We’ve had glider pilots we’re towing that have FLARM ask us to turn off our transponder. We’ve told the glider pilots to turn their FLARM down or off. My recommendation is to either have a switch for your FLARM or know you can turn the volume down to a suitable level.

The question I have is does FLARM show up on ADSB in?

As discussed here before the solution to spurious PowerFLARM alerts in the glider to the towplane ADS-B Out may be to put a PowerFLARM in the towplane so the PowerFLARM in the glider knows it's a towplane and more tolerant of it being close to the glider. There is unfortunately no way for an ADS-B out signal to contain any information to tell PowerFLARM it's a towplane. The FLARM signal does carry that information. it would be great if somebody could experiment with a PowerFLARM portable in the towplane to see if it indeed does solve the issue.

Be careful turning those transponders off, they provide visibility to other aircraft with ADS-B In, TCAS, ATC, all gliders with PowerFLARM with 1090ES In option etc. And if in controlled airspace its a violation of 14 CFR 91.215... and since the towplane is transmitting ADS-B data for all to see and the signal starts going of in flight that may well get noticed. The likely better option if necessary here is for the glider to turn off or turn down the volume on their PowerFLARM while on tow.