rservice wrote on Mar 19^th, 2013 at 7:53am:

The product description says the 300 has taxi camera, and the exterior only is greyed out, which seems to me that it should have functional taxi cameras. I know that this would involve considerable programming, but would only be used on ground manouevering operations, If it is not operational, then I think it should be deleted from the product description, since it is misleading Ron ;) ;)

When something that CS says is greyed out, in this case "exterior only", it means that this will be a feature of the plane but has not yet been implemented in the current release. Usually it will be added in in a future free update.