The European Aviation Safety Agency ordered operators of Airbus A350 airliners to revise fuel-system software to reduce the risk of overheating that could lead to a fire.

A flaw in the hydraulic-fluid cooling system, located in the fuel tanks, may cause the temperature of the liquid to rise quickly, the EASA said in an emergency airworthiness directive that took effect Thursday. That could lead to overheated fluid igniting the fuel-air mix in the tank if its fire-extinguishing system isn’t working.

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