What was found
DURING H-CHECK FOUND SEAT TRACK AT Y450 FR56, FR57 AND FR58 CORRODED. REMOVED CORROSION AS PER SRM 51-74-00 ORIGINAL THK: 0.180", MATERIAL REMOVED 0.042", L-1.5", W=0.5" FOUND EXCEED LIMIT AS PER SRM 53-00-15 FIG 102 AND REPAIR CARRIED OUT AS PER PRI 486597-14 REV 0.