A JetBlue Airbus A320 flight from Cancun to Newark on 30 October 2025 experienced a sudden, uncommanded drop in altitude, injuring at least 15 people. The pilot reported three passengers with head lacerations, and the flight was diverted to Florida. A month later, this incident triggered the grounding of over 6,000 Airbus aircraft—one of the largest recalls in aviation history—causing widespread disruption over the Thanksgiving weekend.
Airbus investigations attributed the malfunction to a single-event upset, or bit flip, caused by cosmic radiation. High-energy particles from space, such as protons, can create neutron showers that strike computer memory, flipping bits from 0 to 1 or vice versa. This can cause unexpected behaviour in electronic systems, particularly in fly-by-wire aircraft that rely on computers for control.
The European Union Aviation Safety Agency (EASA) and the US Federal Aviation Authority (FAA) issued emergency airworthiness directives, warning that such errors could lead to altitude changes exceeding the aircraft's structural limits. Urgent software updates were required for dozens of A320, A319, and A321 variants, with around 900 aircraft also needing new hardware to protect against space radiation.
Professor Matthew Owens of the University of Reading noted that neutron flux increases with altitude, making aircraft more vulnerable than ground-based equipment. While bit flips are common in satellites, they are rare in aircraft but can have severe consequences. The JetBlue incident echoes a 2008 Qantas A330 case where cosmic rays were the likely cause of two sudden descents, though Airbus stressed no link between the two events.
