Summary
This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 series airplanes and C-9 (military) airplanes, that currently requires a one-time visual inspection to determine if the doorstops and corners of the doorjamb of the forward passenger door have been modified, various follow-on repetitive inspections, and modification, if necessary. This action would require a reduction in the inspection threshold and repetitive intervals for a certain doubler configuration and an increase in the repetitive inspection interval for a certain other doubler configuration. This proposal is prompted by a determination that certain inspection compliance times were incorrect. The actions specified by the proposed AD are intended to detect and correct fatigue cracking, which could result in rapid decompression of the fuselage and consequent reduced structural integrity of the airplane.