I think there are several problems.
One is that the removal of the pilot reduced the number of material associated with the model. That menas before re-importing the model into the *.dat remove the respective material/texture from the material list in "linked 3D model" window.
Also, I guess the model has isolated triangle faces around the wheels, partly wrongly inversed. (one may call this effect of excessive edge splitting :-) ) Repairing can be achieved using Meshlab or something similar; Wings3D cannot solve that issue.
Cheers
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