Hi Viper,
Have you any solution in this matter?
I have exactly the same problem than yours.
I can animate left and right gears and spinning tires with no problem. But I can’t animate the nose gear. I made a cross-check: just rename ‘Gear_Center’ and ‘Tire_C_Anim’ in blender to ‘Right_Gear’ and ‘Gear_R_Anim’ and tadaaa the center gear start to work…ergo the animation is good, there’s a bug in the xml and/or simvar name? I ran out of the ideas… 