Airworthiness Directives; Jetstream Aircraft Limited HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 Airplanes

Résumé

This document proposes to revise an earlier proposed airworthiness directive (AD) that would have required the following on Jetstream Aircraft Limited (JAL) HP137 Mk1, Jetstream series 200, and Jetstream Models 3101 and 3201 airplanes: repetitively inspecting the main landing gear (MLG) pintle to cylinder interface for cracks, and replacing any MLG cylinder that has a crack of any length. The proposed AD results from reports of MLG cracks in the area of the pintle to cylinder interface on three of the affected airplanes. Since publication of that proposal, the Federal Aviation Administration (FAA) has determined that the proposed action is still a valid safety issue, but that more stringent repetitive inspection intervals should be established than what was earlier proposed. This proposed AD revises the previous proposal by incorporating this change. The actions specified by the proposed AD are intended to prevent failure of the MLG caused by cracks in the pintle to cylinder interface area, which could result in loss of control of the airplane during landing operations. Since the comment period for the previous proposal has closed and the change described above goes beyond the scop