What was found
MDIS 643 53-30 1586 16MAY19 MEM FACT U FOUND POPPED RIVETS AND BULGE ON FUSELAGE SKIN AFT OF LOWER BEACON (FOUND IN B CHECK NR9) SHGN 16MAY19 07:47 MEM U SHGN 16MAY19 07:52 MEM U REMOVED 4 DAMAGED RIVETS AT LOCATION OF CORROSION STA1661 STR 51L (TRANSFERRED FROM B CHECK JPF NR 9) U CUT OUT AND REMOVED CORRODED SECTION OF LONGERON 51L AT LOCATION STA 1691 AND AFT TO FACTORY SPLICE AT STA 1710 IN REF. TO SRM 53-00-05-2R. CORROSION WAS LIMITED TO LONGERON ONLY. SHGN 18MAY19 01:49 MEM U MATERIAL VERIFICATION FOR LONGERON CUTOUT FABRICATED FROM MPN#1D0590T, CPN#0222553, 7150-T61511. MATERIAL VERIFICATION FOR LONGERON SPLICE MATERIAL FABRICATED FROM CPN#0201861, MPN# 1D1104T, 7150-T61511. PER SRM 53-50-05-01 AND 53-00-05-2R. FABRICATED REPLACEMENT LONGERON SECTION REF SRM 53-00-05-2R. FABRICATED LONGERON SPLICE FITTING PER EA 1-5310-T0347064 PART 1 AND REF SRM 53-00-05-2R. SHGN 19MAY19 02:47 MEM U SHGN 19MAY19 19:14 MEM U INSTALLED REPLACEMENT LONGERON SECTION WITH SPLICE FITTINGS AT STA 1691 AND STA 1710 PER EA 1-5310-T0347064 PART 1. FACT 20MAY19 15:41 MEM U.