What was found
DURING AIRCRAFT HEAVY CHECK IN XMV (XIAMEN, CHINA), HAECO MAINTENANCE DISCOVERED A CRACK IN THE LOWER SURFACE OF THE LEFT-WING MID FLAP COVE PANEL. SEE FIGURE 1 FOR DETAILS. THE DAMAGE WAS EVALUATED PER REF /A/ AND FOUND TO BE BEYOND PUBLISHED LIMITS. THE DAMAGE IS REPAIRABLE PER REF /B/, BUT THE PUBLISHED REPAIR DOES NOT PROVIDE INSTRUCTIONS FOR LOCATIONS WITH POTTED INSERTS P/N 69B00487-3. THE COVE PANEL IS MADE WITH BMS8-79, TYPE 120, CLASS III, 250°F CURE FIBERGLASS SKIN AND BMS8-124, CLASS IV, TYPE V, GRADE 3.0 NONMETALLIC HONEYCOMB CORE PER REF /C/. THE TRAILING EDGE FLAP ASSEMBLIES ARE CLASSIFIED AS PRIMARY STRUCTURE PER REF /D/. NATIONAL AIRLINES CONTACTED FLIGHT VEHICLE CONSULTING FOR FURTHER EVALUATION AND REPAIR INSTRUCTIONS.