With certain plugins, you can pull off animation with AC3D. One plugin is
this one. It was meant for X-Plane, but I think you might be able to use it for other purposes. However, the process you have to go through with that plugin is quite complex. There's a program called
FragMotion. It's quite widely known and used. There's an unlimited free version as well.
To get AC3D models into FragMotion, export your model from AC3D as a .3DS, .OBJ, or any other format FragMotion can accept. Then from FragMotion, you can rig the model, animate it, and finally re-export it for use in whatever else.
I highly recommend using FragMotion instead of an internal AC3D plugin. You can also model in FragMotion if you wish, but it is less powerful.
-PwP-