Hi all,In my last flight it happened to me again. The plane gets a sudden speed-boost and goes too fast. Since I'm flying the auto-pilot the AP disables FMS speed and sets a safe, lower speed (in this case 350kts). The plane slows down, but the AP doesn't increase throttle when the set speed is reached. It remains idle until the low-speed protection kicks in. Pressing the "FMS Speed"-button, setting a different speed or switching to the other AP doesn't help.Any ideas what I'm doing wrong? I'm making regular short flights and this seems to be the only problem I'm regularly encountering.Thanks in advance for any advice!Regards,Michel

Full name please, try it with all weather cleared (no weather) and if problem goes away get a registered copy of FSUIPC and use the wind smoothing.

Bought a registered version of FSUIPC and enabled the weather options. Made several flights since then, and no more sudden in- or decreases of speed.Thanks for your help!Regards,Michel van Driel

The second part of your problem is that the AP is not controlling the throttle. Could it be that noise on the throttle control is confusing FSX into thinking that the pilot has manually reduced the throttle to idle, and taken control from the auto-throttle? There is a menu option somewhere that controls this, but you can just increase the null zone on your controller.Found it - PMDG menu options, AFDS, A/P Controls override settings. [hang on, that was the 747 docs, give me a minute to check the MD-11 ones]Got it - PMDG menu, airline options, joystick options, A/P Controls override, Throttle settings, set to never. You will have to manuall remember to move the throttle when ever you disconnect the auto-throttle to regain manual control.

Hi Paul,thanks for your reply.The setting is already set to never. I'm using the logitech extreme 3DPro controller, which I picked up last week. My old controller was almost dead so I had to replace it. I always recalibrate the joystick before every flight (just an annoying habit I think), but I've checked the values and the throttle control doesn't move even one digit when it isn't touched.To be sure, I tried my old joystick with the weather options in FSUIPC disabled (this causes the plane to overspeed in the first place), but had the same effect.What happens is:The plane overspeeds because the wind changes radically.The AP sets throttle idle and nose up.The speed goes downat the desired speed the AP should increase throttle, but doesn't. It does however decrease pitch and return to the correct flightlevel.Whatever I try, I'm unable to increase throttle. Except: disconnect AP and manually increase throttle.If the AP was somehow overridden by the joystick, increasing or decreasing the throttle control would have an effect, but it doesn't, so I don't think the problem lies there.If the AP remains connected, it only recovers when the plane goes into speed protection mode. Then it increases throttle and maintains the speed entered.I'm still unsure why the plane reacts the way it does.