Summary
This document proposes adopting a new airworthiness directive (AD) for MD Helicopters, Inc. (MDHI) Model MD900 helicopters. The AD would require inspecting and, if necessary, repairing the longitudinal drive link (drive link) and modifying certain nonrotating swashplate (swashplate) assemblies. The AD would also require recording compliance with the AD on a component history card or equivalent record. This proposal is prompted by reports of damage to the drive link assembly caused by the sharp inner edge of the bushing in the swashplate assembly. The actions specified by the proposed AD are intended to prevent damage to the drive link, loss of control of the main rotor system, and subsequent loss of control of the helicopter.