April 30, 201214 yr Hey guys! I am having issues with my PMDG FSX 747 aircraft. When I reach cruise level and enable the VNAV and LNAV everything works fine for some time. Suddenly, the autothrottle goes crazy and my plane goes into overspeed (VNAV disconnects). I find that the THR REF goes away for some reason. I have to press the VNAV again so the aircraft resumes its normal speed. I am using the CH throttle console and haven't found an answer to this issue. I tried lowering sensitivity, null zone, etc. Nothing. Any suggestion is greatly appreciated. Teofilo Homsany
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