Airbus software issue: What we know so far

Key Concepts

• Uncommanded Descent: An unintended and uncontrolled loss of altitude by an aircraft.
• Solar Radiation/Solar Flare: Energetic particles and electromagnetic radiation emitted from the Sun.
• Elevators: Control surfaces at the tail of an aircraft that control pitch (up and down movement).
• Airworthiness Directive (AD): A mandatory instruction issued by aviation authorities to address an unsafe condition in an aircraft.
• Software Update: A modification to the aircraft's computer programs to fix a problem.

Incident Overview

On October 30th, a JetBlue flight from Cancun, Mexico, to Newark, New Jersey, experienced an uncommanded descent. This incident resulted in 15 injuries and necessitated an emergency landing in Tampa, Florida.

Airbus's Concern and Potential Cause

Following the JetBlue incident, Airbus, the manufacturer of the aircraft, has expressed significant concern. They are investigating the possibility that solar radiation, specifically from solar flares, could corrupt data transmitted to the aircraft's elevators. This corruption could lead to uncommanded movements of the elevators, potentially exceeding the structural safety limits of the aircraft.

Regulatory Action and Solution

• Emergency Airworthiness Directive (AD): In response to the potential threat, an emergency AD has been issued.
• Software Update: The primary instruction from the AD is for airlines to update the software on affected aircraft. This update is intended to resolve the issue.

Timeline and Investigation

The incident occurred on October 30th, and the AD was issued some weeks later. This delay is attributed to intensive technical assessments conducted by both the Federal Aviation Administration (FAA) and Airbus to thoroughly understand the cause of the uncommanded descent. The priority was to ensure that random events causing altitude loss are prevented.

Impact on Airlines and Passengers

• Affected Airlines: The situation is particularly concerning for airlines like EasyJet and Wizz Air, whose fleets consist solely of Airbus A320 family aircraft.
• Potential Disruptions: While the software update is expected to take only a couple of hours per aircraft, the high intensity of flight schedules means that even this brief downtime could lead to delays and potential cancellations for passengers over the busy weekend.
• Airline Warnings: Both EasyJet and Wizz Air have issued warnings to passengers about possible flight disruptions.

Likelihood and Aviation Safety

Airbus acknowledges that the likelihood of this specific solar radiation-induced event is very low. However, in aviation, no risk is taken for granted, emphasizing the proactive approach to safety.

Conclusion

The uncommanded descent on the JetBlue flight has triggered a critical safety alert from Airbus. The manufacturer suspects solar radiation could interfere with elevator control systems, leading to dangerous altitude loss. An emergency airworthiness directive mandates a software update to mitigate this risk. While the probability is low, the potential consequences necessitate immediate action, leading to potential flight disruptions for airlines heavily reliant on Airbus A320 family aircraft, such as EasyJet and Wizz Air, as they implement the necessary software fixes.