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Majority of Grounded A320s Return to Service After Airbus Software Update

Majority of Grounded A320s Return to Service After Airbus Software Update
Airlines worldwide have swiftly reinstated the majority of grounded Airbus A320 Family aircraft following a critical software update prompted by a recently discovered vulnerability in certain flight-control computers. Airbus identified the issue as a potential data corruption risk within the Elevator Aileron Computer (ELAC B) when exposed to intense solar radiation, which could compromise the aircraft’s altitude calculations.
Regulatory Response and Technical Remediation
In response, the European Union Aviation Safety Agency (EASA) issued an Emergency Airworthiness Directive (EAD) on November 28, 2025, which took effect at 23:59 UTC on November 29. The directive mandated that operators replace or modify each affected ELAC B L104 unit with a serviceable ELAC B L103+ before resuming passenger flights. Limited ferry flights—restricted to a maximum of three cycles without passengers—were authorized solely to reposition aircraft for maintenance purposes.
Airbus’ Alert Operators Transmission (AOT) clarified that the vulnerability was confined to ELAC B hardware running the L104 software standard. The resolution allowed airlines to either upload the updated L103+ software or physically replace the ELAC units, depending on the specific aircraft configuration. This dual approach facilitated rapid compliance, with most airlines completing the necessary updates during overnight maintenance or between scheduled flights, often within a two-hour window.
Industry Impact and Recovery Progress
By the early hours of November 29, French Transport Minister Philippe Tabarot announced that Airbus had rectified the issue on over 5,000 aircraft out of approximately 6,000 A320 Family jets initially identified for immediate action. Major operators, including the Lufthansa Group, reported that the prompt response significantly mitigated operational disruptions, resulting in only minor delays and no widespread cancellations during the critical holiday travel period.
However, some carriers encountered more substantial challenges. Colombia’s Avianca disclosed that over 70 percent of its fleet was affected, forecasting ongoing disruptions for the next ten days. The airline temporarily suspended ticket sales through December 8 to manage passenger reaccommodation. In India, domestic carriers undertook extensive efforts to comply with the directive, with reports indicating large-scale software upgrades across their A320 Family fleets.
Market reactions included temporary service interruptions and isolated cancellations, but airlines largely contained the operational impact. The incident highlighted the complexity of modern aircraft systems and underscored the vital importance of timely software updates in ensuring fleet safety and reliability. While competitor responses were not widely reported, the aviation sector’s swift and coordinated action demonstrated its capacity to address emergent technical challenges with minimal disruption to passengers.

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