Joe Yukica, whose teams won or shared three Ivy League titles in eight years, was fired yesterday as Dartmouth College's football coach.

Athletic Director Ted Leland said Yukica will be "reassigned" within the college for the length of his contract, which runs through the summer of 1987. Yukica, 54, had no immediate comment.

Despite his success in Ivy League play, Yukica paid the price for three straight losing seasons, including a 4-14-1 stretch in the last two years. Overall, he was 33-41-3, including 0-20-1 against non-Ivy competition . . .

Ray Dempsey, fired as Memphis State's football coach, said he wasn't given enough time to make the Tigers into a winning team.

"Two years is not enough for anybody," said Dempsey, who had a 7-12-3 record, ending the 1985 season at 2-7-2. He was fired Wednesday after refusing to resign. "I signed a five-year contract because it's generally accepted around the country that it takes this amount of time to start winning consistently," he said . . .

An Iowa State University pilot did not detect any trouble aboard his plane until 28 seconds before it crashed Monday, killing all seven aboard, federal investigators said.

The Federal Aviation Administration released tapes and transcripts of the final conversation between pilot Burton Watkins and Des Moines air traffic controllers before the plane -- carrying members and coaches of the Iowa State women's cross-country team -- crashed in a residential neighborhood on Des Moines' west side.

The tapes show Watkins complained of severe turbulence 28 seconds before the twin-engine Aero Commander crashed. Thirteen seconds later, Watkins relayed his final message to the control tower. "I can't do anything. I'm in the trees now," he said.