Transportation Department, Federal Aviation Administration
The FAA is superseding Airworthiness Directive (AD) 2025-04- 05, which applied to all Airbus SAS Model A330-841 and -941 airplanes. AD 2025-04-05 required a revision of the existing airplane flight manual (AFM) and removal of the previously required limitations; a revision of the existing minimum equipment list (MEL); one-time or repetitive seal integrity tests of each engine bleed air system (EBAS) high pressure valve (HPV); additional maintenance instructions and corrective actions; and repetitive replacement of affected HPV clips; as applicable. AD 2025-04-05 also limited the installation of affected HPV clips. Since the FAA issued AD 2025-04-05, an improved EBAS HPV with unaffected HPV clips was certified, and it was determined that the bleed monitoring computer (BMC) software (SW) must be updated. This AD continues to require the actions in AD 2025-04-05, except for repetitive replacement of affected HPV clips. This AD also requires updating the BMC SW, additional work, and an additional revision of the existing MEL for the engine bleed overpressure valve; as applicable. This AD also prohibits the installation of certain BMC software. The FAA is issuing 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-2026-4649; Project Identifier MCAI-2025-00835-T; Amendment 39-23488; AD 2026-20-15] RIN 2120-AA64 AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2025-04- ( printed page 65955) 05, which applied to all Airbus SAS Model A330-841 and -941 airplanes. AD 2025-04-05 required a revision of the existing airplane flight manual (AFM) and removal of the previously required limitations; a revision of the existing minimum equipment list (MEL); one-time or repetitive seal integrity tests of each engine bleed air system (EBAS) high pressure valve (HPV); additional maintenance instructions and corrective actions; and repetitive replacement of affected HPV clips; as applicable. AD 2025-04-05 also limited the installation of affected HPV clips. Since the FAA issued AD 2025-04-05, an improved EBAS HPV with unaffected HPV clips was certified, and it was determined that the bleed monitoring computer (BMC) software (SW) must be updated. This AD continues to require the actions in AD 2025-04-05, except for repetitive replacement of affected HPV clips. This AD also requires updating the BMC SW, additional work, and an additional revision of the existing MEL for the engine bleed overpressure valve; as applicable. This AD also prohibits the installation of certain BMC software. The FAA is issuing this AD to address the unsafe …
Other Federal Register documents from the same docket.
Citation: 91 FR 65954
