Federal Register #2026-16505

FAA Airworthiness Directive: Inspection and Replacement of Airbus AS355 Tail Rotor Transmission Fan Supports

This opportunity concerns a new airworthiness directive (AD) issued by the Federal Aviation Administration (FAA) for Airbus Helicopters Model AS355 series. - Government Buyer: - Federal Aviation Administration (FAA), Department of Transportation - OEMs and Vendors: - Airbus Helicopters (primary OEM for affected helicopters and replacement parts) - BRP-Rotax GmbH & Co KG (OEM for affected propeller gearboxes in a related AD) - Products/Services Requested: - Repetitive inspection of tail rotor transmission fan side supports for cracks on all Airbus Helicopters Model AS355E, AS355F, AS355F1, AS355F2, and AS355N helicopters - Estimated 34 helicopters affected in the U.S. - Inspection cost estimated at $128 per helicopter - Replacement of both side supports if cracks are found - Left-hand side support (Part Number: 355A34104006) - Right-hand side support (Part Number: 355A34104106) - Replacement cost estimated at $2,640 per helicopter - Related: One-time inspection of BRP-Rotax propeller gearbox for missing oil spray nozzle and screws (if applicable) - Unique/Notable Requirements: - Directive is prompted by reports of cracks in the tail rotor transmission fan side supports, which could lead to loss of helicopter control - Applies to all U.S.-registered Airbus AS355 series helicopters - No specific quantities for replacement parts provided; actions are performed as required by inspection results - Compliance is mandatory to address an identified unsafe condition

Description

This airworthiness directive (AD) issued by the Federal Aviation Administration (FAA) addresses cracks found in the legs of the side supports of the tail rotor transmission fan on Airbus Helicopters Model AS355E, AS355F, AS355F1, AS355F2, and AS355N. The AD requires repetitive inspections and possible replacements to detect and correct the unsafe condition. Failure to comply could result in failure of the tail rotor transmission fan support, leading to engine and main gearbox cooling failure, loss of tail rotor drive, and loss of helicopter control. The AD is effective September 17, 2026, and affects 34 helicopters of U.S. registry.

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