What was found
DURING ACCOMPLISHMENT OF SB 747-53A2450 REV 8, 2 EACH CRACKED FASTENER HOLES WERE NOTED, 1 EACH AT BODY STATION 2231 STRINGER S-16L AND 1 EACH AT BODY STATION 2231 STRINGER S-19L. REPAIRS ACCOMPLISHED IN ACCORDANCE WITH B747-400SF STRUCTURAL REPAIR MANUAL 53-60-15-2R-2, WITH DEVIATIONS CALLED OUT IN BOEING SERVICE REQUEST 3-4778074844 AND ITS ASSOCIATED MESSAGES. AD 2013-17-08 ALTERNATE METHOD OF COMPLIANCE APPROVAL ON GRANTED ON 8100-9 DATED 8/23/2020 BY CS ADAMS AR-830677.