What was found
PIT - FL 1095, DURING TAKEOFF AT PIT, THE LEFT OUTBOARD MAIN WHEEL DEPARTED THE AIRCRAFT. CREW WAS ADVISED BY THE PIT TOWER. FLIGHT RETURNED TO PIT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE WHEEL. INVESTIGATION PROCEEDING, REVEALED THE POSSIBILITY EXISTS OF A FALSE TORQUE ON THE WHEEL NUT. (M)