lancair360
Active Member
- Joined
- Oct 19, 2020
- Messages
- 215
Cool thanks! Check that box.
I can really feel your frustration. Since the problem as manifested stays w/ the right side regardless of which screen resides there, it screams to me that there is some sort of flaw with the wiring on the right side. Chasing down a wiring harness problem has to be the very least favorite task of any experienced aviation electronics tech I've ever talked to. Especially if it's only intermittent.Another nugget of info and a reminder as to why this is a huge deal. When I get the AP panel offline master caution I lose my trim. That’s not suppose to be possible. As long as you got power and ground running through the panel trim is fail safe. Well it’s not.
Now if I have everything up and running and I pull a network cable out of the AP panel and get a master caution AP panel off line my trim still works! But if it fails in its normal failure mode I lose all my trim.
It’s not a 12v problem or it would surface before the second screen boots. It’s something in the computer and/or network. At this point it seems Dynon is stumped and out of ideas. The current plan is to remove the AP panel from the loop and fly normally, see if any other failures occur they may be being caused by that screen.
Another nugget of info. I swapped the screen left to right right to left and the problem stayed on the right side of the plane and didn’t follow the screen.
The only thing I haven’t done is swap the cables on the two D9 ports on the back of the AP panel but I suspect only one side will trigger the AP panel offline and not the other, and it’ll stay that way. I don’t know if that means the failure is in the new AP panel or if it’s just an artifact of the serial network but everyone is out of ideas.
I could tell stories, but they mainly bring back painful memories.....Chasing down a wiring harness problem has to be the very least favorite task of any experienced aviation electronics tech I've ever talked to. Especially if it's only intermittent.
Since we know it’s a network issue that’s leaves us with the AP panel itself, the two screens and the cables. And since the failure is only happening after the right screen boots that narrows it to one screen, one cable, and the AP panel.So this may be more difficult to do, but if you have a friend or friends with Dynon systems, you could start to eliminate *those* elements by temporarily swapping them with your friends', one item at a time, to see if the problem goes away or remains. If it sticks around, then it wasn't that component (EFIS, AP panel, etc.).
Time-consuming and a PITA, but it's one more tool in the debugging bag to think about.
If I understand the failure modes correctly, if you bypass the AP panel, the trim still works manually. Why not just jumper the Skyview network cables around the AP panel, taking it completely out of the network, and just manually trim? Then you can at least use the plane while they figure out the rip you've caused in the space-time continuum.Spoke with Dynon yesterday. No one can figure out how I’m getting a failure that’s not possible yet. They aren’t very suspect of the new AP panel. Waiting to see how we will move forward. Hopefully hear more later today or tomorrow. I’m grounded until it’s fixed. No trims means no fly.