1. It CAN happen. 2. Nothing, but if you run into the wrong Fed you might find out what he thinks you're trying to hide. In reality, it's unlikely, but all it takes is a few examples to get around for people to think twice about potential consequences. When my crew bellied a Cardinal in after an hour of unsuccessful attempts to extend it, they had the trucks ready and it was *mostly* a non-event. I think a good scenario-based course on what to do after an accident wouldn't be bad for pilots to take from time to time. I agree with some others that if there's something someone outside the plane can do to help, it's worth going ahead and declaring, and that might be as simple as making sure you have priority for the runway, and that others know there may be a delay.