EMPLOYEE WAS RIDING IN THE BACK SEAT OF A 12-MAN OPEN MANTRIP. AS THE MANTRIP WENT THROUGHT THE AIR DOORS, THE EMPLOYEE RAISED UP ON HIS KNEES TO CLOSE THE DOORS. WHILE HE WAS CLOSING THE DOOR S HE HIT HIS HEAD ON THE AIR-DOOR SWITCH CAUSING A LACERATION TO HIS UPPER LIP AND A FRACTURE TO HIS NOSE AND JAW.