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PMDG 777 Nose Wheel Steering after pushback

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CapnTibbs:
Hi guys,
On the past couple of flights I've done in the 777, after disconnecting the tow bar, the nose wheel is stuck to the left and when I even nick the rudder the aircraft just takes off to the left with full right rudder barely being enough to keep the aircraft going straight. I'm 99.9% sure that GSX is causing the problem and that the problem is not isolated to the 777. I've tried a number of tactics, using Quick Edit pushbacks and putting waypoints in them, disconnecting my rudder pedals when the nose wheel is centered, turning off the hydraulics during the pushback to let the nose wheel go freely, nothing has fixed the issue. I've scoured the forums here looking for suggestions and fixes and found absolutely nothing.

I know what the issue is and what is causing it, I just need a fix for it.

Thanks

virtuali:

--- Quote from: CapnTibbs on December 28, 2021, 11:55:31 am --- I've scoured the forums here looking for suggestions and fixes and found absolutely nothing.
--- End quote ---

The problem is, nobody ever reported it before, that's why you can't find anything.


--- Quote ---I know what the issue is and what is causing it, I just need a fix for it.
--- End quote ---

That's your problem: being "sure" GSX is the problem, when it likely isn't because, if it was, you would have found similar reports, considering how popular BOTH GSX and the PMDG 777 are. And if it really was a GSX problem, it would have been fixed already.

While it's possible that *WHILE* GSX is pushing, you might see some visual flickering of the rudder pedals in the VC, which is caused by the PMDG internal simulation of the rudder that is "fighting" with the GSX truck setting the rudder at the same time ( which could be easily fixed by PMDG if they did what other developers like FS Labs, Aerosoft or Leonardo SH that have similar custom systems they momentarily turn off while GSX is pushing, checking a variable GSX exposes just for that reason ), AT THE END of the Pushback, when it says "bypass pin has been disconnected", GSX will stop acting on the rudder so, if it's "stuck" for you, it must be caused by something else.

Of course, before posting this, I did my usual checking and, sure enough, there are no issues I can see. See the below video I just made, which shows how the rudder works normally at the end of the pushback.

Captain Kevin:
I've seen it happen a couple times before, but the problem is it's not consistent, so I don't know what would cause it. 5:30 into this video, you'll see it works fine, but 1:24:00 in, you'll see the rudder goes to the left after pushback.

https://www.twitch.tv/videos/1168786851

In this one, no issue at 6:10, but it happens at 3:03:41.

https://www.twitch.tv/videos/1192932152

In this one, no issue at 5:10 or 1:22:04.

https://www.twitch.tv/videos/1194765726

In this one, no issue at 5:32. Not sure at 2:36:07. It may have happened at 4:39:08. No issue at 6:01:48.

https://www.twitch.tv/videos/1197054206

virtuali:

--- Quote from: Captain Kevin on December 28, 2021, 04:44:53 pm ---5:30 into this video, you'll see it works fine, but 1:24:00 in, you'll see the rudder goes to the left after pushback.
--- End quote ---

What I see in that video is:

1:23:12 - GSX says "tow truck disconnected, bypass pin removed", which means it has stopped acting on the rudder.

1:23:15 - Immediately thereafter, the Flight controls check page shows the rudder is working perfectly fine, further confirming GSX is not controlling it anymore.

1:24:25 - The nose gear looks turned so, whatever happened between the previous confirmation of the rudder working normally and now, can't possibly be GSX, which at this time has already recalled the truck, so it's not doing anything.


--- Quote ---In this one, no issue at 6:10, but it happens at 3:03:41.
--- End quote ---

Same here.

The controls page shows the rudder centered when the GSX truck is already moving out, so clearly it has released the rudder.

In fact, if you notice the external view at that time, the nose gear is turned almost completely to the left, but the rudder it's not.

The rudder is the only thing ( during the pushback, only ) which GSX controls so, the real issue here seems that is some cases, what is likely a custom variable PMDG set up for the nose steering system, which is a non-standard system ( which GSX never dare to touch, of course ), has lost its sync with the standard variable for the rudder, possibly because their code doesn't expect the rudder to be controlled by another app, even if it's only for a short while. Maybe it doesn't always happen, because the code is eventually able to re-establish the sync, but that's just a guess.

Captain Kevin:
One thing to add here is that I have PMDG set to use the tiller, so the nose gear would be controlled by the tiller rather than the rudder.

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