RECALL 'PRUDENT,' NASA SAYS
The astronauts flying the space shuttle Columbia were ordered today to cut short their mission and prepare to bring the troubled craft back to a landing tomorrow afternoon in the desert of California. Col. Joe H. Engle of the Air Force and Capt. Richard H. Truly of the Navy plan to steer the winged spaceship to a touchdown at 4:22 P.M., Eastern standard time. Until one of the craft's three fuel cells failed after liftoff yesterday, the mission was supposed to last five days, ending next Tuesday. Now it is scheduled to end after two days, six hours and 12 minutes. 'Prudent Thing to Do' Christopher C. Kraft Jr., director of the Johnson Space Center here, said at a news conference this afternoon that the decision to curtail the flight was ''the prudent thing to do at this point'' in testing the world's first re-usable space vehicle.

