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How do you trim the plane manually? Trim tabs are hardly the only way to trim a plane. There are trim springs, movement of the whole elevator, and probably others. So whatever you do to trim the plane manually can be done electrically with an actuator, and the Dynon A/P head can control that...

I haven't been paying extremely close attention to all the failures you've had here, and you've stated that you've now replaced the screens and the A/P controller, and have rung out all the wiring. What I don't recall hearing about is the A/P servos. They're smart and have electronics in them...

Are you talking about using VNAV purely from the Skyview, approaching an airport or runway, or are you talking about using VNAV as driven from an IFR navigator of some type?

That would be easy enough to implement with an air pressure switch - I use two of them in my nose gear auto-extend circuit.

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...

I don't find it onerous at all. While any small screen keyboard is somewhat problematic, "awful" is not the word I'd use. It's completely usable. Obviously, YMMV, but that's my experience after using it for 2 years. And not for nothing, but you can change your flight plan on Foreflight and...

Did you end up in Schenectady?

Yes, via the Wifi dongle. Do it all the time.

The chronosyclastic infundibulum inverts and you end up in Schenectady.

Interesting that you can do that, but since the plate doesn't get any bigger when you do, what's the purpose in eliminating the other useful information on the screen (PFD, Map)?

Nope. I only use it as a switch for the landing gear circuitry. But the Skyview can (if configured) now display AGL in the map INFO items, if you want it. Still doesn't output it into the serial stream, though, for unknown reasons. I don't know if the Skyview AGL display would be (or is)...

It depends on the rest of the electrical system of your plane, and how you have everything grounded. If you just have ground wires attached to the AL structure of the plane, you may induce ground loops. If you have all your grounds going to one particular ground bus, that's less likely. If you...

What the OP is calling a "missed approach" switch is normally referred to as a TOGA (Take-Off and Go-Around) switch. This is usually a momentary double pole switch that has two purposes - it grounds a line to the IFR Navigator (in my case, a Garmin GPS-175) and it grounds a line to the Skyview...

Not just "frowned upon". No solid wire allowed per good manufacturing practices. AC 43.13-1B, Chapter 11, page 11-21, section 11-66(a) is clear that no wire with less than 19 strands shall be used. 1 < 19, last I checked. Not regulatory, but...

Well, there goes that possibility - as you say, if two units have the same behavior, it's not the head. Which then sends us back to some sort of wiring issue. Can you somehow swap in some OTHER 12V DC motor (some sort of actuator that pulls < 2A), to see if THAT changes the behavior? If it...

So one difference between "trim connected" and "trim not connected" is that when the motor is not connected to the two wires to the A/P head, they are just dangling, and the two pins on the A/P head are effectively not connected to anything. However, when the trim motor is connected (even when...

Why not just trim manually with the AP engaged, rather than disengage it?

Last response on this topic, because you seem to have already decided that wiring can't be the problem, no matter what the symptoms show, but I'd bet that the issue here is a bad connection in the Skyview network wiring. MOVING the A/P head back and forth causes a disconnect - it's not EMI/RFI...

Charlie, if physically moving the A/P panel causes it to go offline, that's pretty good indication that some connection somewhere is suspect. That doesn't seem to have anything to do with the pitch trim system. Probably/possibly the Skyview network connections.

I have a "Strong" Pitch trim system in my COZY MKIV. It does NOT draw more than 2A (hence the callout for a 2A breaker in the wiring). I do not have a "TRIMAMP", nor do I need one. If you're using a 2A CB and it doesn't pop when you run your trim, then YOUR trim motor isn't drawing more than 2A...