What was found
(CAN) LT SIDE OF FUSELAGE, DISCOVERED 4 LOOSE RIVETS AT FS 176.5. MAINTENANCE DEPT REMOVED INTERIOR TO INVESTIGATE DEFECT. IT WAS DISCOVERED THAT FRAME MEMBER P/N 50-420028-57 WAS CRACKED IN SEVEN SPOTS. MAINTENANCE DECIDED TO INVESTIGATE THE RIGHT HAND OF FUSELAGE EVEN THOUGH NO INDICATION FROM OUTSIDE OF AIRCRAFT. ONLY THREE CRACKS WERE DISCOVERED THERE TO FRAME P/N 50-420028-58. TOTAL CYCLES SINCE LAST DETAILED FUSELAGE INSPECTION OF THESE AREAS IN 1859. REPETITIVE EVERY 3000 CYCLES. NO PREVIOUS DAMAGE NOTED. (TC NR 20060822006)