The National Transportation Safety Board has directed the Federal Aviation Administration to require Robinson Helicopter to issue a service letter addressing mast-rocking vibrations in the main rotor assembly of R44 helicopters.
Safety recommendation
The National Transportation Safety Board has directed the Federal Aviation Administration to require Robinson Helicopter to issue a service letter addressing mast-rocking vibrations in the main rotor assembly of R44 helicopters.
The National Transportation Safety Board (NTSB) has issued safety recommendation ANC09GA040, designated as A-11-084, addressed to the Federal Aviation Administration. This recommendation mandates that the FAA require Robinson Helicopter to issue a service letter to all approved service centers. The letter must describe the mast-rocking vibration that can occur in the main rotor assembly of R44 helicopters. Additionally, the recommendation instructs these service centers to report all incidents of mast rocking directly to the manufacturer. This action aims to ensure that potential safety issues related to this specific mechanical phenomenon are properly documented and addressed across the fleet.