EASA 2019-0139

Superseded but retains the requirements of AD 2018-0186, which mandated a one-time inspection of the main rotor hub scissors attachment bolts. Latest AD also equires the marking of affected parts, repetitive inspections to detect rotation and, depending on findings, any necessary corrective actions. Prompted by a reported occurrence where, during a pre-flight inspection, a main rotor hub scissors attachment bolt was found to be broken and another was found bent. Preliminary results of the technical investigation revealed that the event “might be due to exceedance of acceptable criteria of corrosion and some other efforts applied to the affected main rotor hub scissors attachment bolts.”