What was found
DURING BASIC CHECK IN BNA, CRACK DAMAGE WAS FOUND AT THE FLANGE RADII OF THE LOWER CORNER ON THE RH APU FIREWALL REMOVABLE PANEL P/N 170-50263-401 FROM AIRCRAFT N619CZ MEASURING APPROXIMATELY 0.100 INCHES. EAMS REQUESTED RELIEF FOR A PERMANENT REPAIR AND WAS PROVIDED ETD2013-170-059175, WHICH ALLOWED THE CRACK TO BE ROUTED OUT AND THEN NDT INSPECTED FOR CRACK TERMINATION. EA E175-53-395.1 WAS LATER ISSUED TO ACCOMPLISH SUPPLEMENTAL FOLLOW-ON INSPECTIONS OF THE REPAIR EVERY 10,000FC AS REQUIRED BY ETD2013-170-059175. AT A LATER BASIC CHECK, ADDITIONAL DAMAGE WAS DISCOVERED AT THE PANEL UPPER AND LOWER CORNERS. THE SRM PART II 53-31-21/REPAIR 02 REPAIR WAS ACCOMPLISHED, WHICH CUT OUT THE DAMAGE AT THE UPPER AND LOWER CORNERS AND INSTALLED A DOUBLER IN THE LOWER CORNER. AT THE SUBSEQUENT B6 BASIC CHECK, NEW CRACK DAMAGE WAS DISCOVERED ON THE LOWER REPAIR DOUBLER. REFERENCE FIGURE 1 FOR DETAILS. THE DAMAGE TO THE LOWER REPAIR DOUBLER CAN BE REPAIRED BY REPLACING THE REPAIR DOUBLER IN ACCORDANCE WITH SRM PART II 53-31-21/REPAIR 02 TYPE III. COMPASS ENGINEERING HAS CLASSIFIED THIS AS A MINOR REPAIR. THE APU FIREWALL PANEL IS NOT FCS, BUT IT REQUIRES FOLLOW UP INSPECTIONS PER SRM PART II 53-31-21/REPAIR 02. EA E175-53-395.3 WILL BE ISSUED TO ACCOMPLISH THE FOLLOW-ON INSPECTIONS OF THE DOUBLER REPAIRS EVERY 10,000FC. EORK ORDER 2793447