What was found
(CAN) UPON DEPLANING OF A/C AT DESTINATION, PASSENGER NOTIFIED CAPTAIN THAT OUTBOARD PORTION (LATCH SIDE) OF HIS SEAT BELT HAD BECOME DETACHED FROM HIS SEAT WHEN HE ATTEMPTED TO SECURE IT FOR DESCENT INTO AIRPORT. HE HAD THEN MOVED TO ONE OF UNOCCUPIED SEATS IN PREPARATION FOR LDG. MAINT DISCOVERED THAT NUT & SPACER-BUSHING WERE MISSING FROM SEAT BACK PIVOT / SHACKLE RESTRAINT BOLT, WHICH HAD ALLOWED SEAT BELT SHACKLE TO COME DETACHED FROM SEAT (S/N 15065)