Airworthiness Directives; Boeing Model 737-200 and -300 Series Airplanes Equipped With Cargo Doors Installed in Accordance With Supplemental Type Certificate (STC) SA2969SO

This amendment revises an existing airworthiness directive (AD), applicable to certain Boeing Model 737-200 and -300 series airplanes, that currently requires 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. That amendment was prompted by reports of premature fatigue cracking on the support angles on the lower jamb of the main deck cargo door. The actions specified in that 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. This amendment requires a change in the cognizant aircraft certification office for requesting approvals of alternative methods of compliance with the provisions of this AD.