Summary
This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Boeing Model 737- 200 and -300 series airplanes, that currently requires repetitive inspections to detect cracking in the radii on the support angles on the lower jamb (latch lug fittings) of the main deck cargo door, and replacement of cracked parts. This action would add a requirement for installation of redesigned lower jamb latch support angles in the main cargo door surround structure, which would terminate the repetitive inspections. This proposal is prompted by the development of a modification that will provide better protection of the subject area against effects of structural fatigue. The actions specified by the proposed AD are intended to prevent in-flight separation of the main deck cargo door from the airplane due to fatigue cracking on the support angles on the lower door jamb.