Summary
This document proposes the supersedure of an existing airworthiness directive (AD) applicable to Agusta Model A109C and A109K2 helicopters. That AD currently requires removing the main rotor pitch control link assemblies, measuring the radial play of each upper and lower spherical rod-end bearing (bearing), and replacing any unairworthy bearing. This action would require replacing the pitch control link assembly with an assembly that has increased durability and wear resistance. This proposal is prompted by reports of increased helicopter vibration caused by wear of bearings on certain pitch control link assemblies. The actions specified by the proposed AD are intended to eliminate the need for recurring bearing inspections and to prevent failure of a bearing, increased helicopter vibration, and subsequent reduced controllability of the helicopter.