Paris, France: An Air France Boeing 777-300ER bound for Réunion Island was forced to return to Paris Charles de Gaulle Airport (CDG) on October 24 after a sudden malfunction in the aircraft’s air-conditioning system caused extreme heat inside the cabin, prompting the pilots to declare an emergency.
Flight AF652, operated by a Boeing 777-328(ER) registered F-GZNG, took off from CDG at 18:01 local time en route to Saint-Denis, Réunion. About 50 nautical miles southeast of Zurich, the flight crew reported rapidly rising cabin temperatures and an unusual smell of overheating. Passengers reportedly described the cabin as turning into a “sauna,” with the temperature climbing to uncomfortable levels within minutes.
According to Business Insider, the crew first issued a “PAN-PAN” urgent call before upgrading to a “MAYDAY” to request priority handling and clearance to dump fuel over French territory prior to returning to Paris. The aircraft landed safely at Charles de Gaulle approximately two hours after departure.
Air France confirmed the incident, stating that the flight “experienced a technical malfunction in the cabin temperature regulation system,” and that the decision to return was made “in accordance with standard safety procedures.” All 312 passengers and 14 crew members disembarked safely, and no injuries were reported. A replacement aircraft was dispatched later that evening, completing the journey to Réunion with a delay of about six hours.
An initial review indicates a fault in the Environmental Control System (ECS), which regulates temperature and air circulation. The specific cause whether a software issue, valve malfunction, or sensor failure has not yet been confirmed. France’s Bureau d’Enquêtes et d’Analyses (BEA) is expected to open an investigation into the technical sequence that led to the overheating. Air France issued an apology to passengers, reaffirming that “safety remains the airline’s top priority.”
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