PROFICIENCY & EFFICIENCY 85 MAINTENANCE 89 ON INSTRUMENTS 92 PROFICIENCY 98 NEVER AGAIN Dynon Avionics began in 2000, introduced SkyView in 2009, and HDX in 2016. Dynon HDX upgrade Plug and play, mostly B Y D AV E H I R S C H M A N 82 | AOPA PILOT July 2020