October 26, 20178 yr 2 hours ago, mopperle said: Did meanwhile make 3 flights (each over 3 hrs) without any problems and today, again same strange behaviour. Suddenly during climb with 1200ft/min at 150 kts IAS at around 15000 ft aircraft suddenly started to turn ending in uncontrollable turns, climbs till stalling. Again, trim seemed to be the problem: during the normal climb, the trim was around -4 and during the strange behaviour again I noticed +12! I'M out of ideas now, especially as I can not reproduce it. @Peter: do you use the GTN750 under P3Dv4.1? Hi Otto, thanks for asking. I hadn't used the GTN 750 in 4.1 yet. I did a quick check and it appears it is not compatible yet. Peter
October 26, 20178 yr I realized that the latest update for 4.1 needs to be installed using the full installer. After that, HTN seems to work fine with the PC12. Peter
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