What was found
DURING LAX "C" CHECK VISIT W.O 36243; RH OB FLAP - IB FWD HINGE ASSEMBLY 3 STRUCTURAL CRACKS WERE DISCOVERED. ARB2431-2 (OB SIDE OF ASSEMBLY )1.25" CRACK FROM 1ST TO 2ND FASTENER. 1.25" CRACK FROM 5TH TO 6TH FASTENER. NON-ROTINE N01103 ARB2431-502 (IB SIDE OF ASSEMBLY) 1.00" CRACK FROM 10TH TOWARD 11TH FASTENER. EA 8-5710-105699 WAS CREATED. BOEING HAS DETERMINED THAT THE CRACK (S) CONDITION IS STRUCTURALLY ACCEPTABLE FOR CONTINUED SERVICE. E.A. 8-5710-105699 REQUIRES AN INSPECTION AT EACH "B" CHECK UNTIL THE HINGE SUPPORTS ARE REPLACED AT NO LATER THAN THE NEXT "C" CHECK OR 24 MONTHS. THE HINGE SUPPORT FITTINGS WILL BE REPLACED WITH IMPROVED PARTS.