Transport Canada 2019-35

Requires a one-time inspection of the airframe truss clevis lower lug truss assemblies and corrective action for helicopters affected by an excessive gap, including reducing the nut torque to reduce the stress from the fastener installation. However, Transport Canada said this reduced fastener installation torque results in reduced preload and therefore reduced friction between mating parts, making the joint more susceptible to wear and fretting. Thus, affected helicopters also require repetitive inspections to monitor the joint condition for wear and/or fretting, it added.