What was found
LT MLG AFT UPPER TRUNNION HAS POSSIBLE CRACK IN RADIUS ABOVE FASTENER. PERFORMED HFEC INSPECTION ON AFT UPPER TRUNNION AND FOUND TO BE CRACKED, IAW EASI NDT MANUAL NR 6581 (400 KHZ H 60.6 V72.6 ANGLE 127 DEGREES). REMOVED AND INSTALLED SERVICEABLE LT AFT TRUNNION, IAW AERNNOVA TI NR TI-145-14-018 LT REV F, ETD2020-145-032819 AND EO1-57-20--0421. SEE NRTC'S E827994, E828197, E828328,AND E828329 FOR STRUT REMOVAL, DOORS REMOVAL AND INSTALL SPOILER HYD LINESRAR AND CLAMPS AND CLAMP BLOCKS RAR.