The STC list for Dynon’s HDX Certified avionics has been slowly growing and now includes the Piper PA-34 Seneca series twins. Other than the HDX’s expansion into twin applications, what’s significant is the autopilot that’s embedded within the HDX suite. Like other twins, the majority of aging Piper Senecas have aging autopilots—mainly Piper/Century systems that might need major repairs, or at least a boost in capability.
When we first reported on the Dynon HDX Certified system (see the installation/flight trial article in the July 2019 Aviation Consumer) the only STC was for the Cessna 172 series, but it was expanded to Beech Bonanzas and now Piper Senecas. The installation network has grown to just shy of 30 shops, making the HDX more accessible and supportable. The installation—after buying the $5000 STC—can be done by approved A&P mechanics who have current IA credentials.