
Two stall warnings on a British Airways A320 triggered a mayday near Heathrow. The AAIB is investigating the July 6 incident, which involved a data system failure and a switch to alternate flight law.
A British Airways flight declared a mayday on approach to Heathrow earlier this month after two stall warnings, according to the UK's Air Accidents Investigation Branch.
The AAIB said it is investigating a serious incident on the Airbus A320, which was flying from Dusseldorf on July 6. The plane landed without further incident.
France's accident investigation authority, the BEA, said a data system failure triggered the first stall warning. The crew switched to "alternate law," a flight mode that removes some automated protections. A second stall warning followed at 3,000 feet, likely miles from the runway, experts said. The crew upgraded their initial urgency call to mayday, signaling imminent danger.
The BEA attributed its statement to the AAIB, but the AAIB would not confirm that. The AAIB said the probe would be a correspondence investigation, meaning no field team would be deployed.
A British Airways spokesperson said the airline was assisting the AAIB and could not comment further while the investigation is active.
Aviation safety investigator David Gleave said urgency messages are not unusual. "You could have sick passengers on board who need urgent medical attention... so it's up to the captains' discretion as to what they call, but its very unusual for it to be a significant failure on board the aeroplane."
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