Federal Register #FAA-2026-8790

FAA Proposed Airworthiness Directive for Airbus Helicopters SA330J Main Gearbox Fan Bearings

The Federal Aviation Administration (FAA), under the Department of Transportation, is proposing a new airworthiness directive for Airbus Helicopters Model SA330J. - Government Buyer: - Federal Aviation Administration (FAA) - Aircraft Certification Service, Compliance & Airworthiness Division - OEM Highlight: - Airbus Helicopters - Products/Services Requested: - Repetitive inspection of main gearbox (MGB) oil cooling fan assembly rotor blade for gaps - Replacement of MGB fan rotor bearings with serviceable bearings if necessary - Replacement of MGB fan rotor bearing assembly with improved assembly (terminating action) - Notable Requirements: - Prohibits installation of non-serviceable MGB fan rotor bearings or assemblies unless specific requirements are met - Extends compliance time for installing improved bearing assemblies - Addresses safety risks including rotor burst, hydraulic line and flight control damage, and potential loss of helicopter control - Affected Population: - Three U.S.-registered Airbus Helicopters SA330J - No specific part numbers or quantities provided; directive applies to all affected helicopters

Description

The FAA proposes to supersede Airworthiness Directive (AD) 2025-08-06 for certain Airbus Helicopters Model SA330J helicopters. The directive requires repetitive inspections for a gap between the main gearbox oil cooling fan assembly rotor blade and the guide vane bearing housing, replacement of bearings if necessary, and eventual replacement of the fan rotor bearing assembly with an improved assembly. The proposed AD extends the compliance time for installing the improved assembly and prohibits installation of certain bearings unless specific requirements are met. This action addresses an unsafe condition to prevent rotor burst, damage to hydraulic lines and flight controls, and loss of control of the helicopter.

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