SYSEVENT 21, 5

[Seagull]

I have a Skyview touch with about 1800 hours on it. In the past 7 hours I have had it shut down and reboot twice. The first time was in flight about 5 minutes after takeoff, the second time it was right after, (1 minute), starting. The screen goes black and within 1 minute is back looking normal. The message in the bottom right is “SYSEVENT 21: SEE SETUP, SYSTEM EVENT 5: SEE SETUP”

 

[Rhino]

What does setup say? When was your last update? Have you checked all connections? Have you checked power/battery levels? Have you checked the logs?

Have you contacted Dynon?

System Event 20 & System Event 21 at startup

This is second one I've experienced this year. Master on and all system were initialized. I hit the starter button and the PFD rebooted with System Event 20 and System Event 21 errors. It has also happen to my wingman, whose install is identical to mine. We both have all Dynon Advanced...

forum.flydynon.com

 

[Tlwhite1]

I too have HDX with 500 hours on it. updated to 17_4_0_0 on December 2, 2025. Flight 12/10/25 no problems. Flight 12/19/25, I got a black screen about an hour into the flight. Held the #1 button until it rebooted. It was not a battery issue. Got the message SYSEVENT: SEE SETUP. Sent the diagnostics file to Dynon, but have not yet heard back from them.

 

[Seagull]

Dynon was quick to get back to me. The issue is a known problem. Issue 5 requires the screen to be sent in and they will fix it out of warranty, issue 21 will be addressed in the next update. I am still flying mine for another 2 weeks when I will be down for some routine maintenance then sending it in. It isn’t a safety of flight issue for me since it reboots immediately and I have backup in the cockpit.