Received certified letter from a Micheal A. Smith ADS-B Focus Team of the FAA, Houston Flight Standards District Office yesterday. Letter states the FAA has monitored flights by my aircraft in which the installed ADS-B system failed to comply with performance requirements specified in 14CFR 91.227. The airplane in question is Staudacher S600-F with a Lynx3 NGT-9000 which PASSED a ADS-B Performance Monitor on October 17, 2017. Since passing this benchmark, all the flights have Aerobatic in nature, very little straight and level.

Does the IAC / EAA, and other members have any suggestions to replying to this letter and the problem it represents? Appreciate the assistance, PB