Airworthiness Directives; Airbus Helicopters

DEEPER READ

This proposed airworthiness directive (AD) from the FAA addresses a specific mechanical safety concern: the loss of tightening torque between the upper ball bearing end and the main rotor servo-control on certain Airbus helicopter models. The affected models include the AS350B3, AS355F, AS355F1, AS355F2, AS355N, AS355NP, EC130B4, and EC130T2. A servo-control is a critical flight component that helps pilots control the main rotor, and improper torque on this component could compromise helicopter controllability. The legal basis for this action falls under the FAA's authority to issue airworthiness directives when an unsafe condition is identified in an aircraft type or model. These directives are legally binding on operators and owners of the affected aircraft registered in the United States. The FAA uses its regulatory authority under Title 49 of the United States Code to mandate safety inspections and repairs. The primary parties affected are operators, owners, and maintenance personnel responsible for the listed Airbus helicopter models. This includes commercial helicopter operators, emergency medical services, law enforcement agencies, and private owners who fly these aircraft. Maintenance technicians certified to work on these aircraft would be responsible for performing the required inspections. As a proposed rule, this AD is currently in a public comment period before it becomes final. Interested parties, including operators and manufacturers, may submit comments to the FAA. Once finalized, the AD would establish a compliance timeline specifying when inspections must be completed, which is typically within a defined number of flight hours or calendar days. Reporting requirements would add an administrative obligation for operators to document and submit their findings. This action reflects a routine but important part of aviation safety oversight. Airworthiness directives are issued regularly by the FAA in response to reported mechanical issues and are a standard mechanism for keeping aircraft in service while ensuring safety risks are identified and addressed promptly.

AS PUBLISHED

The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Helicopters Model AS350B3, AS355F, AS355F1, AS355F2, AS355N, AS355NP, EC130B4, and EC130T2 helicopters. This proposed AD was prompted by a report of the loss of the tightening torque between the upper ball bearing end and a main rotor (MR) servo-control. This proposed AD would require an inspection of the nut tightening torque of the upper ball bearing end of all the MR servo-controls and, depending on the results, corrective actions. The proposed AD would also require reporting the inspection results. The FAA is proposing this AD to address the unsafe condition on these products.

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