What was supposed to be a training flight turned into a lesson in how to crash land Thursday at the Denison airport. Crawford County Sheriff Tom Hogan describes what happened. He says this was a training or testing session of an ultra-light airplane. He says as the ultra-light took off with the trainer on board, they failed to get enough lift and were forced to make a rough landing that extensively damaged the ultra-light. Hogan says they were able to quickly get help to the downed plane. He says the whole thing was witness by some people who were flying a radio controlled plane and they called it in right away. The ultra-light was piloted by Larry Clayton of Urbandale. Neither Clayton or his passenger were injured.