What was found
DURING SCHEDULED MAINTENANCE, PASSENGER SEAT AFT FACING BEHIND COPILOT, WRITTEN UP AS 'LOOSE IN TRACK'. DISCOVERED FRONT FLOOR MOUNTED BRACKET CRACKED AND TORN FROM SEAT FRAME. SUSPECT CAUSE, SEAT BACK USED AS LEVERAGE INTO COCKPIT: ALSO, AIRCRAFT TYPE CERTIFICATE DOES NOT ALLOW FOR VARIATIONS IN CONFIGURATION OF SEATS. AIRCRAFT IS AOG.