Summary
The FAA proposes to supersede Airworthiness Directive (AD) 2025-04-05, which applies to all Airbus SAS Model A330-841 and -941 airplanes. AD 2025-04-05 requires 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 limits 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 proposed AD would continue to require the actions in AD 2025-04-05, except for repetitive replacement of affected HPV clips. This proposed AD would also require updating the BMC SW, additional work, and an additional revision of the existing MEL for the engine bleed overpressure valve; as applicable. This proposed AD would also prohibit the installation of certain BMC SW. The FAA is proposing this AD to address the unsafe condition on these products.