The original Airwolf helicopter, which was modified with the props for the aerial scenes in the show, was sold and converted into an air ambulance helicopter in Germany. It crashed in 1992.
Here is one of the better recaps of what happened with more specific details than most other sources which mention the horrific crash:
If interested, within the article there is a close-up image of the original Airwolf flight suit patch as seen on the show.
Thanks to fans: