What was found
DURING THE B1 BASIC CHECK IN BNA, CRACK DAMAGE WAS FOUND IN TWO LOCATIONS AT THE UPPER AND LOWER CORNERS OF THE RH APU FIREWALL REMOVABLE PANEL 351BZ (P/N 170-50263-401) ON AIRCRAFT N207AN. THE DAMAGE WAS REPAIRED PER SRM PART II 53-31-21/REPAIR 02 USING THE TYPE I REPAIR IN THE LOWER CORNER BY TRIMMING OUT DAMAGE AND THE TYPE VI REPAIR IN THE UPPER CORNER BY DRILLING OUT DAMAGED SPOT WELDS AND INSTALLING A DOUBLER IN THE AREA. AT THE FOLLOWING B2 BASIC CHECK IN BNA, A NEW CRACK WAS FOUND ON THE LOWER CORNER WEB REINFORCEMENT, WHICH CAN BE REPAIRED USING THE TYPE IV REPAIR BY CUTTING OUT THE DAMAGE AND INSTALLING A DOUBLER. COMPASS ENGINEERING HAS CLASSIFIED THIS AS A MINOR REPAIR. EA E175-53-943.1 WAS ISSUED TO ACCOMPLISH SUPPLEMENTAL FOLLOW-ON INSPECTIONS OF THE REPAIR EVERY 10,000FC REQUIRED PER SRM PART II 53-31-21/REPAIR 02, AND ITS INSTRUCTIONS REMAIN VALID EVEN AFTER ADDITIONAL REPAIR PER THIS EA. WORK ORDER 2825368