On November 3, 1997, about 1300 central standard time, a Piper PA-28-151, N4502X, registered to a private owner, operating as a 14 CFR 91 personal flight experienced a hard landing at Steep Head Farm Airstrip, Clarksville, Florida. Visual meteorological conditions prevailed at the time, and no flight plan was filed. The airplane sustained substantial damage. The private pilot was not injured, and the private-rated passenger sustained serious injuries. The flight originated from Marianna, Florida, about 30 minutes before the accident. The pilot stated that about 1000, she and her passenger departed Steep Head Farm Airstrip, flew to Marianna Municipal Airport where they each completed two or three touch-and-go landings to runway 26, and flew a circuituitous route back to Clarksville. Upon their return to Clarksville, the pilot attempted a landing to runway 19, but abandoned the approach and elected to land runway 01. The airplane landed hard halfway down the runway. On touchdown the nose gear collapsed, one propeller blade contacted the runway, the left main gear separated, and the airplane skidded to a stop. Total landing rollout was estimated to be 50 to 75 feet. The pilot said the throttle and mixture control stuck. According to FAA records, an A&P mechanic inspected the airplane after the accident and stated the throttle and mixture control worked free and clear for their full range of travel. The recorded winds at Tallahassee at 1052 were 260 degrees, 12 knots, gusting to 20 knots. The recorded winds at Tallahassee at 1252 were 270 degrees, 15 knots, gusting to 22 knots.