A Vermont pilot crashed at a Haverhill airport Sunday afternoon, officials said.Haverhill police said Lynn Perry, 70, of Bradford, Vermont, was the only person aboard.The Federal Aviation Administration said an unregistered gyrocopter crashed at Dean Memorial Airport.Police responded at 12:21 p.m. when Good Samaritans walking by the airport saw the aircraft on the ground and the unconscious pilot.Haverhill first responders arrived and later transported Perry to Dartmouth Hitchcock Medical Center. A Dartmouth Health spokesperson said Perry is in critical condition. Police said further investigation will be through the FAA, NH DOT Aeronautics, and Rail and Transit authorities. North Haverhill fire dept. and Woodsville ambulance assisted at the scene. Anyone with more information can call the FAA 1-866-835-5322.