Airworthiness Directives; Boeing Model 727, 727C, 727-100, and 727-100C Series Airplanes

Riepilogo

This document revises an earlier proposed airworthiness directive (AD), applicable to certain Boeing Model 727-100 and -100C series airplanes, that would have required repetitive inspections of the frame inner chord, outer chord, and web of the forward and aft edge frames of the lower lobe forward cargo door (FCD) cutout, and corrective action if necessary. This new action revises the proposed rule by adding high frequency eddy current inspections and a detailed inspection for cracks of certain areas described above. This new action also removes one airplane from the applicability. The actions specified by this new proposed AD are intended to detect and correct fatigue cracking of the forward and aft edge frames of the lower lobe FCD cutout, which could result in the loss of the FCD and rapid decompression of the airplane. This action is intended to address the identified unsafe condition.