Concept

Vol Scandinavian Airlines 751

Résumé
Scandinavian Airlines System Flight 751 was a regularly scheduled Scandinavian Airlines passenger flight from Stockholm, Sweden, to Warsaw, Poland, via Copenhagen, Denmark. On 27 December 1991, a McDonnell Douglas MD-81 operating the flight, registration OY-KHO, piloted by Danish Captain Stefan G. Rasmussen (44); and Swedish first officer Ulf Cedermark (34), both experienced pilots with 8,000 and 3,000 flight hours, respectively, was forced to make an emergency landing in a field near Gottröra, Sweden. Ice had collected on the wings' inner roots (close to the fuselage) before takeoff, broke off, and was ingested into the engines as the aircraft became airborne on takeoff, ultimately resulting in the failure of both engines. All 129 passengers and crew aboard survived. The incident is known as the Gottröra crash (Gottrörakraschen) or the Miracle at Gottröra (Miraklet i Gottröra) in Sweden. The aircraft was a McDonnell Douglas MD-81, registered OY-KHO with serial number 53003, line number 1844. It made its first flight on 16 March 1991, and was delivered soon after to SAS on 10 April 1991. At the time of the accident, the aircraft had been in service for only nine months. It was fitted with two Pratt & Whitney JT8D low-bypass turbofan engines. The aircraft had arrived at Stockholm-Arlanda Airport at 22:09 local time after a flight from Zürich the previous evening and was parked overnight at temperatures of around 0 to 1 °C (32 to 34 °F). About of very cold, flight-chilled fuel remained in the wing tanks. Due to this, clear ice had formed on the upper side of the wings, but was not detected. The aircraft was de-iced with of de-icing fluid, but not checked afterwards for remaining ice by the de-icing personnel or the Pilot-in-Charge, Captain Rasmussen, which he was required to do by the Scandinavian Airlines "Flight Deck Bulletin/Winterization" given to pilots. The plane departed from Stockholm at 08:47. Shortly after liftoff, pieces of ice broke off and slammed into the fans of both engines, deforming the fan blades sufficiently to disturb the airflow to the compressors.
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