I was flying LHBPEDDH and during last third of flight when I started descending (1000ft/min) the 737 started tilting left, right, left, right while keeping course. The speed was 290 knots at round about 21k feet when the problem started.
Then I got a bank angle warning and the 737 to descend with 15000ft/min which lead very fast to a crash cause overstressed structure.
Since I did not change anything nor fly in a different way I do not understand how this could have happened?
Interestingly since SU13 hit Iāve noticed something like this happen a few times. I fly airliners a lot (not just PMDG 737), and this issue has happened to me maybe 3 times in last 40 flights. But ON MULTIPLE AIRLINERS.
Iāve had it happen on the PMDG737(just this morning in fact), but also on the Asobo/WT B787-10 and also the Maddog MD-82. Like I say it seems intermittent/occasional. I have no idea what is causing it though.
Symptoms for me : I am always on a climb at the last part or just after the SID while in VNAV/LNAV mode with ATR engaged and Autopilot on when the aircraft will suddenly bank to the left or right and give ābank angleā warnings. I have had to intervene and disconnect AP, fly the aircraft manually to stabilise (and point in correct direction again) then engage the AP again and most times itās fine afterwards. The exception being the 787 flight when I didnāt cacth this early enough and it spiralled downwards adn I had to restart (whcih was absolutely fine the 2nd time on that same flightplan and setup).
I find it interesting that we are the only people seeing this and also that it happens across airliners suggesting something is going on in the sim. It has only been since SU13 that I have seen this issue, and I am not on the beta. I do try to do 2-3 flights a day so maybe Iām just seeing it happen because Iām using it a fair bit. I donāt know.
Would be interesting to hear if anyone else has seen any issues like this.
I have been too late. I was observing and trying to understand instead of disconnecting the AP. When it sinks down with 15000ft/min it was too late.
Yes you donāt have long to intervene it banks quite steeply and fast. Like I say I lost the 787 flight quite quickly because of that. An immediate manual takeover with AP disconnect is the only way Iāve found to recover. I did get it back this morning on the 737 on a otherwise routine flight from EGPF ā EHAM. Wasnāt doing anything at the time sim wise it gos into this mode all on itās own. Itās just not just the 737 though which screams a sim issue to me.
My virtual passengers gave me poor marks for the āextreme flying conditionsā they encountered!
There are a couple of bug reports related to ābankingā, maybe one of those is the same issue reported here ?:
Search results for ābanking #bugs:aircraft-systems in:titleā - Microsoft Flight Simulator Forums
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Thatās interesting will go have a read. On the summaries though it looks like it across multiple aircraft there too. Which again implies an occasional sim issue kicking in.
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I had a similar issue a while back with the Flysimware C414. I was on an approach into BOS when suddenly the airplane decided to roll to the left onto its back and I couldnāt recover in time. It turned out to be a bad livery that I was using. Once I deleted that livery, the problem never happened again.
At the beginnig it was so mild that i guessed it was just correcting the course.
It seems so, and they refer to different types of aircraft, as BragRaindrop933 already wrote. So, probably an Asobo problem?
I can exclude the livery since it is a livery i fly nearly always when i fly the Boeing 737-600. But interesting that it was a livery in your case. Hopefully you never run into this problem again.
If it helps i am using Bravo Throttle Quadrant but i guess the problem is not related to hardware.
Just a hard to quantify one for the devs. Everyone reporting it on different aircraft but whoās tying that together as an intermittent sim issue?
Me too as I have had it happen on 3 different liveries so far. Interesting to look out for though.
Iāve just got a Hotas + throttle. So I donāt think it has anything to do with H/W. I was doing absolutely nothing on hotas, throttle, keyboard or mouse when it decided to bank and dive to the right today. AP doesnāt even disconnect, it just banks badly to one side almost to 90deg and goes down. No AP input or HDG mode will recover it. Just manual input with AP disconnected.
Itās annoying, but intermittent enough I can just about live with it. The fact Iāve seen identical behavior on 3 airliners now suggest it is a sim issue albeit a hard one to quantify or report or replicate.
I seriously suggest discussing this in our forum or sending our support a ticket if you are able to recreate an issue like that. Currently, we have no known issues like that open, so we have to explore other things that could cause this.
Which forum are talking about? PMDG? The problem seems to occur with many aircraft.
But I donāt dare to leave cockpit now since it could happen always. It is a little bit more than just annoying. If I just would know at least when it might happen?
It has always happened to me just after reaching a waypoint either at the end of the SID or the next waypoint afte. Once you are at cruise it seems fine. 3 times now always at that part of the flight.
I have a theory from what happened in the 787 that the waypoint was reached, but the aircraft didnāt see it as being reached so it banked hard to go back to target that same waypoint it just passed over. A clue maybe but canāt be sure. I have not seen anything happen like this on any aircraft while at cruise or descent itās always (for me) late SID waypoint or early waypoint after SID (but not at cruise).
Also keep in mind that itās a low frequency event. So I see it 1 in every 20-30 flights maybe.
If it happens I can load the exact same fligthplan in the exact same aircraft and depart again and it wonāt happen. Itās that random, and nothing to do with aircraft type, ap mode or flightplan. (IMO)
And to me, it happened yesterday druing cruise at last third of flight. When it happens again, I would switch to HDG at AP just to see if the aircraft will be stabilized.
But one thing had both times in common, in my case with 737. The aircraft was at descent with little VS (1000ft/min).
That is different to what Iāve seen but maybe I just havenāt encountered it yet or your problem is a different one to the one I am seeing, but it sounds very similar.