Originally Posted by
IO540
Indeed, as well as the EFD-1000 (when that gets certified as a KI-256 replacement), but how long will these keep running after your alternator fails? It hangs on how big the backup battery is. 30 mins is not enough for real IFR involving long flights.
The Aspen is allready certified to replace the KI 256 and KCS55 with full autopilot/FD functionality. You will need to fit an additional seperate airdriven AI so an electrical failure will leave you in the same place as your current set up.