What was found
DURING SCHEDULED ACFT INSPECTION, RT MAIN GEAR INBD DOOR'S FWD HINGE FORGING FND CRACKED IN INNER RADIUS. THE CRACK IS DETECTABLE VISUALLY EVEN THOUGH PART IS PAINTED; VISUAL PORTION OF CRACK IS THROUGH APPROX 25 PERCENT OF MATERIAL THICKNESS. SUBMITTER STATES THIS IS THE HINGE INSTALLED IAW AD 80-26-05, & PIPER SB 682. THIS IS 7TH CRACKED OR FAILED HINGE FND SINCE BEGINNING OF 1995 BY THIS OPERATOR. WITH AD 80-26-05 UP FOR REVISION (DOCKET 90-CE-59-AD), FAA & PIPER MAY WANT TO CONSIDER A FURTHER IMPROVED HINGE FORGING. WHILE CRACK RATE OF CURRENT P/N IS LESS THAN OLD PRE-AD STYLE, PROBLEM HAS NOT BEEN CORRECTED & BEARS FURTHER IMPROVEMENT.