I just noticed that something still isn’t right with the standby VOR’s TO/FROM flag behavior. Although the desired radial can be selected independently now, as per the last update, the TO/FROM flag isn’t moving properly to indicate inbound or outbound course.
The only way to get the TO/FROM flag to flip on the standby VOR is with the CRS knob on the EFIS control panel. It needs to flip TO/FROM with the movement of the OBS knob. Short video to illustrate the behavior…
Very Strange. I just tried it again after my initial test and as I suspected I got the same result. It works fine here. Was using the PMS install if that helps.
i just had a weird issue where i was at 18k and ATC asked me to maintain altitude and mentioned QNH, so i figured i had to come out of STD pressure, but when i set the QNH, all of sudden a horn started sounding, the red lights on landing gear came on (but lever was up), and the throttle went to idle, and wouldnt increase with either my binding or manually using the mouse to drag it, it just kept snapping back to idle, had to quit??!! Anyone else experience anything like that before?
This is how the autopilot in the PC-12 works. The pitch trim light is indicating the autotrim system function in operation. Here are a few references from the PC-12 Pilot’s Information Manual
Ok, I switched to the PMS avionics, as well, but the TO/FROM flag is still not responding as it should to the CDI movement. I should be able to see the TO/FROM flag flip back and forth when I dial in either the inbound or outbound radial from the #2 VOR and I still don’t see that. Can you confirm that you are seeing to TO/FROM flag flip by just turning the OBS dial?
I am not doubting that the autopilot can and does move the pitch trim and therefore the green A/P trim annunciator illuminates. But it happens too often, namely all the time. Explaining it using the diagram you quoted: The third connection to the PITCH SERVO doesn’t seem to exist in the SWS PC-12. Every little small adjustment is done using PITCH TRIM, making the A/P trim light flash all the time the A/P is in a pitch mode. Trimming by the A/P should just happen from time to time, just like when flying by hand.
Agree it is a bit aggressive. I do wonder however how much the sim environment may be playing into the trimming. It’s similar to when I flew the MD-88 yesterday. The auto throttles make a high-pitched but faint whine to let you know they are moving. And they seem to ALWAYS be moving during cruise level flight.
Yep exactly the test you originally posted. I can get the to/fr flag to toggle between states in and around the obs radials that would dictate the difference between a to and a from. Also confirming the OBS is only being controlled from the CDI itself. Like I said it’s strange that it doesn’t do it for you. Have you tried to clear out the community folder?
Oh it’s there else the aircraft couldn’t climb or descend, fly an approach etc. The holding and adjusting will be with the main pitch servo but for some reason in the sim every time that changes it seems to drive the need for trim also. In reality the trim is not required until a control force threshold is exceeded.just as with pilot control so should be much less often.
Thanks for confirming that for me. There is indeed a conflict somewhere in my community folder. I will attempt to track down the offending addon and go from there. 
Thanks again!
I doubt that the connection is there at all. I have never seen the yoke move back and forth when the A/P is on (it does in the lateral axis for left and right but not for the vertical axis).
I never have the yoke in view anyhow so that’s not something I’m ever looking at and could just be a sim animation thing. Not sure what you mean by connection as it’s all just a simulation anyhow. As long as the aircraft pitches up/dn appropriately how that’s done is down to the simulation. The fix is simple enough just make the light flash much less often in level flight for a more realistic experience.
IRL the AP uses the yoke and then smoothly trims it out to neutral.
The MSFS autopilot can either use trim or yoke, not both. In addition to that, the threshold for trimming is very small so the AP will trim almost all the time. That last part is under research as AP trim is “of limited smarts” in MSFS.
The only proper solution for the above is a fully custom autopilot & trim system that will override MSFS’ limited logic, but that is outside the scope of the PC-12. We are working on a custom AP for another plane and it could find its way into the PC-12 “HiFi” expansion when done.
My takeaway from analyzing several different models of aircraft is that it all comes down to the sim’s basic and often incomplete AP logic shoehorned into AP logic that may or may not be understood by a developer.
Note that in no way am I saying that about you - I’m talking about the fact that most people (including myself) have no idea the actual under the hood logic that’s programmed into an autopilot, and that’s before we get to what control surfaces it is actually actuating. The result is they are fairly deterministic, many of them are approximated, some better than others, and some of them, as you say, require a workaround or a completely separate subroutine to operate properly.
About trim… is that a way to assign a button to trim up and trim down ?
You can use the MSFS controls for elevator trim up and trim down.
I tried but did’nt succes. I don’t undertand why
I gave the PC 12 another chance today, but no, it’s just not fun,
and probably only the best pilots in the world can land this aircraft safely if the simulation is correct.
and I have many hundreds of hours on a Piper 46-500TP. I wouldn’t trust myself to land this plane safely.
Just to be clear for anyone reading this comment, this is not the objective truth. There is an 80 knot limit where you are going to struggle to land if you’re above that but otherwise it’s totally possible to land it safely.
Objective truth?
The MSFS is a game that tries to simulate airplanes as best as possible, so there is no objective truth there.
An airplane should always be able to land with safety reserves and you always have to have the feeling of being in control of the situation and that’s exactly what I’m missing with this airplane…
And yes, I can just say that I’m just not enjoying this plane at the moment.
and yes, I’ve always landed the PC12 safely in the simulator so far, but it’s no fun
And yes, that is a very subjective opinion
