What was found
(CAN) TRAILING EDGE OF HORIZONTAL STABILIZER BEAM ASSY CRACKED ON FORWARD EDGE OF THE COVER PLATE ALONG THE RADIUS IN 4 LOCATIONS. THE LONGEST CRACK WAS APPROX 2 INCHES LONG. BEAM LENGTH IS 12 FEET. THE RADIUS SHOULD BE .25 INCH RADII AND WAS ONLY.10 INCH RADII ON MANUFACTURE. THE DEFECT OF PLATE (BEAM ASSY) IS ATTACHING POINT FOR LOWER HORIZ STAB ACCESS PANEL. REPLACED. PART TC: 46,379. AIRCRAFT TT: 50,989 HOURS.