MEMBER WAS RIDING ON THE INBY END OF THE MANTRIP WHILE COMING OFF THE SECTION. THE BUS PROCEEDED THROUGH THE FIRST SET OF AIRLOCK DOORS. THEY THEN OPENED THE NEXT SET OF DOORS & PROCEEDED THRO UGH. WHILE THE MANTRIP WAS GOING THROUGH, THE DOORS GRADUALLY CLOSED & CAUGHT THE INBY END CANOPY POST CAUSING THE DOOR TO BREAK DOWN. THE CANOPY LANDED ON INJURED'S RIGHT ARM AND SHOULDER.