EASA 2019-0258

Requires a one-time inspection of Ti-bolts installed on the aft connection of the ball bearing control and, depending on findings, the accomplishment of applicable corrective action(s), and a prohibition of installation of affected parts. The AD stems from a reports of a broken Ti-bolt found on the affected helicopter. Subsequent investigation determined that an improper heat treatment process was accomplished on a certain batch of Ti-bolts, which can lead to hydrogen embrittlement of the affected parts.