Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to all Airbus Model A300 B4-600, A300 B4-600R, and A300 F4-600R series airplanes, that would have superseded an existing AD. The existing AD requires repetitive inspections to detect cracks of certain attachment holes, installation of new fasteners, and follow-on inspections or repair if necessary. The proposed AD would have reduced the inspection threshold and repetitive intervals and expanded the area to be inspected. This supplemental notice of proposed rulemaking (NPRM) would further expand the area to be inspected, and would require a modification of the angle fittings of frame FR47. This supplemental NPRM would also remove certain airplanes from the applicability. The actions specified by this supplemental NPRM are intended to prevent fatigue cracking of the forward fitting of fuselage frame FR47, which could result in reduced structural integrity of the frame.