What was found
WEAR ON EXTERNAL FUSELAGE SKIN STA Y=994 BTW LONGERON 25R/L26R. SUMMARY OF NRC 00018: EXTERNAL FUSELAGE SKIN STA Y=994 BTW LONGERON 25R/L26R WAS REPAIRED PER ERA 577681-14 REV B SECTION II: PERMANENT REPAIR AND PRI 577681-14 REV 1 PART C. REPAIR APPROVAL IS LIMITED TO 58,000 TOTAL AIRCRAFT CYCLES. ADDITIONAL ENGINEERING AUTHORIZATION (ERA REVISION) IS REQUIRED FOR CONTINUED SERVICE BEYOND THIS LIMIT. NOTE TO ENGINEER: DAMAGE TOLERANCE EVALUATION IS REQUIRED IN ACCORDANCE WITH PROCEDURES ESTABLISHED IN FAA AC 120-93, UNDER LOG PAGE #0252688. ASSOCIATED ERA 14-577681.