The HDX in my RV-12 misbehaved in a bizarre way yesterday (04/28/2020) on a routine flight from Santa Monica to Camarillo. Shortly after takeoff, the display blinked and navigation data disappeared (no HSI or CDI, and no info in the Map Info column). After just a moment, the nav data came back, disappeared again, and came back again, and on approach to Camarillo disappeared for good. Wind and cross-wind information disappeared and came back too. Correct (or at least logical) altitudes were displayed on the entire flight to Camarillo. After taking off from Camarillo for the return flight, there was no nav or wind info, though again, correct altitude was shown for 10 minutes or so. Then, part way into the return flight, the altitude tape indicated I had suddenly leaped from 3,500 feet to more than 50,000 feet, and I got repeated "Check Pitot Heat" warnings, but no other warnings at all. Shortly before landing at Santa Monica, navigation info came back, though the altitude tape continued to show more than 50,000 feet, and there was still no wind information. After landing, I taxied to the fuel pump to refuel, and I shut down the engine and HDX. When I restarted the HDX and engine to taxi back to my hangar, the HDX showed nav data and the correct altitude! I went back to my hangar this morning to download the User Data Logs (and the Diagnostic File), and the HDX showed nav data and the correct altitude again. I've looked at the User Data Logs, and they show correct GPS Altitude information for the entire flight in both directions, but FlightAware and FlightRadar24 both show me at more than 50,000 on the return flight. The User Data Logs also show "0" GPS satellites for brief periods. The information in the User Data Logs fascinated me, but didn't give me a clue as to what the problem was, let alone how to repair it. Any advice on what I should to now would be very much appreciated.
HDX suddenly lost nav and airspeeds, and showed altitude was more than 50,000' instead of 3500'
- Thread starter Lon
- Start date
jakej
Well-Known Member
Contact DS direct, the chances of a ‘poster’ seeing the same symptoms are zero IMO. The sooner you do that the sooner you can safely go flying again
Yes, I agree about the chances of anyone having seen the same symptoms. Before posting here, I went directly to the Dynon website, but the "Support" page doesn't have a link for direct questions. Instead, it has a link for this forum. I'm pretty sure that someone from Dynon watches these pages, and tomorrow (I hope) will post a link and a "ticket number" and invite me to send in my Diagnostic File.Contact DS direct, the chances of a ‘poster’ seeing the same symptoms are zero IMO. The sooner you do that the sooner you can safely go flying again