What was found
MCN - MAJOR REPAIR - C - DURING C-15 CHECK MAINTENANCE FOUND CORRODED FLOORBEAM AT BS 967, FROM RBL 15 TO RBL 18, WL 208.1. MAINTENANCE CLEANED AND BLENDED CORRODED SECTION OF FLOORBEAM AND PERFORMED MATERIAL THICKNESS MEASUREMENT FINDING MATERIAL LOSS OUT OF LIMITS. REMOVED AND REPLACED CORRODED FLOORBEAM IAW B737-300 SRM 53-60-51 FIG 1 PG 6, 105-114, 53-00-51 FIG 203 PG 5, 212-215, AND 51-20-01 PG 10, 47.