September 23, 20187 yr With altitude hold selected, the plane rocks up and down +/- 500 fpm. I turned off the weather and reset AP...but she won't stay put.
September 23, 20187 yr Lots of info missing for trouble shooting. Weight? Altitude? Temperature? IAS? RPM? Edited September 23, 20187 yr by J35OE
September 25, 20187 yr Author I'll take her up again and get the exact data...but basically normal cruise parameters. I"ll be back with more precise data. Edited September 25, 20187 yr by rennman
September 25, 20187 yr In most cases this problem occurs if you are trying to climb at a too low IAS (below 190kias) and/or to a too high flight level. E.g. MTOW the max level is 'only' FL350. In a jet you can't trade energy in a climb to maximum altitude. If you are climbing to a too high altitude by trading speed for altitude you are stuck at a too low IAS with a wallowing AP. Time compression is also a factor in many cases, even at 'correct' FLs.
September 25, 20187 yr Author I made this video...She overshoots FL320, and when I hit ALT hold she erratic...Let me know what you think. Thanks again.
September 25, 20187 yr Looks like the FMC/AP ALT interaction to me. AFAIR the Carenado FMC and the FSX/P3D AP altitude hold sometimes don't work together and then these oscillations start to happen, but I'm not 100% sure. It's definitely not your flying which causes this problem and with the target FL set, the AP should automatically switch from FLC to ALT CAPT and ALT. Edited September 25, 20187 yr by J35OE
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