EMPLOYEE WAS RIDING IN THE BACK END OF A MANTRIP AND DIDN'T GET DOWN LOW ENOUGH TO GO THROUGH THE DOORS AND HIT HIS HEAD ON DOOR FRAMING AND WAS PULLED OUT OF MANTRIP. POSSIBLE BROKEN NOSE, CUT ON UPPER LEFT SIDE OF LIP AND RED SWOLLEN SPOT ON CHEEK BONE BELOW LEFT EYE. FOUR BREAKS INBY #3 HEAD ON TRACK ENTRY AT AIRLOCK DOOR.