Transportation Department, Federal Aviation Administration
The FAA proposes to supersede Airworthiness Directive (AD) 2025-08-06, which applies to certain Airbus Helicopters Model SA330J helicopters. AD 2025-08-06 requires repetitively inspecting for a gap between the main gearbox (MGB) oil cooling fan assembly rotor blade and the upper section of the guide vane bearing housing, replacing the MGB fan rotor bearings with serviceable bearings if necessary, and at a later compliance time replacing the MGB fan rotor bearing assembly with an improved MGB fan rotor bearing assembly, which constitutes terminating action for the repetitive inspections. Since the FAA issued AD 2025-08-06, the FAA has determined that the compliance time for installing the improved MGB fan rotor bearing assembly should be extended. This proposed AD would continue to require the actions in AD 2025-08-06 and would increase the compliance time for installing the improved MGB fan rotor bearing assembly. This proposed AD would also prohibit installing any MGB fan rotor bearings and any MGB fan rotor bearing assembly, unless certain requirements are met. The FAA is proposing this AD to address the unsafe condition on these products.
Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Department of Transportation Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2026-8790; Project Identifier MCAI-2025-01793-R] RIN 2120-AA64 ( printed page 56081) AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD) 2025-08-06, which applies to certain Airbus Helicopters Model SA330J helicopters. AD 2025-08-06 requires repetitively inspecting for a gap between the main gearbox (MGB) oil cooling fan assembly rotor blade and the upper section of the guide vane bearing housing, replacing the MGB fan rotor bearings with serviceable bearings if necessary, and at a later compliance time replacing the MGB fan rotor bearing assembly with an improved MGB fan rotor bearing assembly, which constitutes terminating action for the repetitive inspections. Since the FAA issued AD 2025-08-06, the FAA has determined that the compliance time for installing the improved MGB fan rotor bearing assembly should be extended. This proposed AD would continue to require the actions in AD 2025-08-06 and would increase the compliance time for installing the improved MGB fan rotor bearing assembly. This proposed AD would also prohibit installing any MGB fan rotor bearings and any MGB fan rotor bearing assembly, unless certain requirements are met. The FAA is proposing this AD to address the unsafe condition on these products. DATES: The FAA must receive comments on this NPRM by Oct…
Citation: 91 FR 56081
