FAA Proposes Oxygen Limits on Airbus ETOPS Flights

The Federal Aviation Administration on April 29, 2026, proposed a new airworthiness directive for specific Airbus SAS Model A330-200 and A330-300 airplanes, requiring revisions to flight manuals to address oxygen shortages in extended operations, with public comments due by June 15, 2026.

The rule targets Airbus A330-200 and A330-300 series airplanes modified under a supplemental type certificate that equips the flightcrew oxygen system with a single cylinder. Per the Federal Register notice, these modifications affect an unspecified number of aircraft operating under ETOPS-180 rules, which allow flights up to 180 minutes from the nearest airport.

The FAA identifies the issue in planes configured for four flightcrew members, where oxygen supply falls short during maximum diversion scenarios. Standard knowledge of aviation regulations indicates ETOPS operations are common for transoceanic routes, potentially impacting airlines like those in the U.S. and internationally that use these models for long-haul flights.

The proposed directive alters the existing setup by mandating updates to the Airplane Flight Manual Supplement. Previously, these aircraft could operate ETOPS-180 with four crew members, but the finding shows oxygen insufficiency in all circumstances for that configuration.

The new rule would limit such operations to three flightcrew members and include corrections to minimum oxygen dispatch pressure data. If finalized, the changes would take effect after the comment period closes on June 15, 2026, and following FAA review and publication of a final rule, typically within months.

Airlines operating affected Airbus models must revise their flight manuals upon adoption, triggering compliance checks and potential operational adjustments for ETOPS routes. The FAA's action initiates a 45-day public comment period ending June 15, 2026, after which the agency will evaluate input and decide on finalizing the directive, possibly leading to mandatory inspections or modifications.

This could prompt affected carriers to reassess crew scheduling and route planning to maintain ETOPS certifications.

The proposal stems from a safety finding on single-cylinder oxygen systems, as detailed in the Federal Register document. The FAA has issued similar airworthiness directives in the past for Airbus models, including updates to oxygen systems under prior administrations, to align with evolving aviation safety standards.