Transport i lotnictwo · 1.04.1996

Airworthiness Directives; Boeing Model 727 Series Airplanes

This document proposes to revise an existing airworthiness directive (AD), applicable to all Boeing Model 727 series airplanes, that currently requires inspections to detect loose attach fitting bolts of the door actuator of the main landing gear (MLG), inspections to determine whether serrations are fully mated, and various follow-on corrective actions. That AD also provides for an optional terminating modification for certain requirements. That AD was prompted by reports of loose attach fitting bolts of the door actuator of the MLG. The actions specified by that AD are intended to prevent an airplane from landing with one MLG partially extended. This action would provide operators the option of terminating all of the requirements of that AD by replacing the aluminum rib fitting with a new steel rib fitting, or by modifying the rib fitting assembly and performing various follow-on actions.