Ok Guys pay attention here. For my last two flights which were from Venezuala to Columbia, since i decided to fly a little bit outside of the US and explore South America. I used FSBuild and created a flight plan and saved it for PMDG and FSNavigator. started everything normally took off and arrived at my cruising altitude, but after that the airpalane went out of control and started climing, and descending. the autopilot stoped controling the aircraft speed rose to 580 Knots at one time went back to around stall speed, and of course after all that the Sim realized that the aircraft went to much of control and shut down.and the problem is that this happened for two straight flights.So what do you guys think the problem comes from. the only thing that would make since to me is simulator crashing. But for two straight times. Or the PMDG 737 doesn't like to fly over south America. Best Regards Adib Afraj.

Probably a bit too far north, but did part of your route fly over the equator, Adib...? I noticed some erratic behaviour when I did this on my round the world trip.Cheers.Ian.

Well by looking at the World Map it looks like that i did not fly over the equator, but does that cause anything not normal.I am asking if somebody can try this flight and give us some feedback.Fligth Plan.SVMI-PBL-A550-CTN-BUV-BOG-SKBOAircraft Used 737 PMDG Using PMDG Paint of 737-700 With Stairs.FL330 try to download Weather as well.and watch out for some weird behaviors after arriving at cruising altitude.Thanks For The Help.Best Regards Adib Afraj

Hello Adib,are you by any chance resizing your FS window by pressing ALT+enter?I have noticed that with the PMDg when I go from full screen to windowed mode or back the plane just goes crazy!!I used to have a similar problem with the PIC 767 butin that case the throttles used to retard to idle andthen go back to normal. The PMDg's autopilot seems to go bezerk instead.That's the only time I noticed such behaviours as you describe.Hope this helps.Best regards,Bjorn

Well i have always been running my Sim on windowed Screen. no full screen for me. But when my Sim loads up it loads up as a small windowed screen and then i maximise it by making a full windowed screen. But i am going to set it for a maximised window by default just to be sure. But speaking of this i flew several flights under the same conditions from Norfolk Virginia To KMCO,KMIA,TNCM,SVMI and from SVMI-SKBO that's when i had the probelm occure and more then one time for two different tries.Weird Ah:-rollBest Regards Adib Afraj

Hi Adib,I have a follow-up on this situation. Tonight as I was flying from EGKK to LIPE online I had the same scary problems you had! The plane wouldn't hold altitude after reaching my cruise alt of FL 350 with any vertical mode activated and kept going violently up and down. The only way I could stop it was to use CWS Pitch. I finally had to divert attempting first a landing in Turin but had to go-around due to weather below minimums and flew the ILS in 0 vis manually because the plane with A/P engaged wouldn't hold steady.Finally went to LIMC and executed an autoland beasue of almost 0 vis there too and this time the A/P held pretty steadily but still tended to wobble up and down a bit and for a moment I thought the nose gear would collapse.After taking away the slightly injured passengers that didn't have their seat-belts on and clearing the mess of bags, trolleys and puke :-) I started thinking about what happened: Well it all started when I played with the trim while the A/P was connected during the climb. It's the first time I play with the trim and infact it's the first time I experienced this wild A/P behaviour.So to make a long story short maybe that was also your problem...hopefully this could be the solution for you! :-)Sorry for the long tale..hope at least you enjoyed it! :-))Best regards,Bjorn