What was found
COPILOT INBOARD SEAT RAIL AFT END, STA 27.02 TO STA 56.69, FOUND FLOORBOARD CRACKED AT AFT END OF INBOARD SEAT RAIL (COPILOT SIDE). THE CRACK WAS 2 INCHES IN LENGTH AND CORRESPONDED DIRECTLY WITH THE AFT END OF THE SEAT RAIL. THE FLOOR BEGINS TO CONTOUR UPWARD AT THIS LOCATION. SUBMITTER RECOMMENDATION: PUT A SLIGHT BEVEL ON THE AFT END OF SEAT RAILS, THEREBY, PREVENTING A STRESS RISER IN THE AREA. NOTE: THIS DEFECT HAS BEEN FOUND ON SEVERAL C-152'S IN FLEET.