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𝗦𝗰𝗮𝗻𝗱𝗶𝗻𝗮𝘃𝗶𝗮𝗻 𝗔𝗶𝗿𝗹𝗶𝗻𝗲𝘀 𝗙𝗹𝗶𝗴𝗵𝘁 𝟳𝟱𝟭 was a scheduled international passenger flight from Stockholm to Warsaw with an intermediate stop in Copenhagen. The flight was being operated by a McDonnell Douglas MD-80 (Reg. OY-KHO) on 𝗗𝗲𝗰𝗲𝗺𝗯𝗲𝗿 𝟮𝟳, 𝟭𝟵𝟵𝟭.
The plane took off from Arlanda's runway 08 at 08:47. After 25 seconds (at 1,124 feet height) bangs, vibrations and jerks were perceived in the plane. This was caused by a no. 2 engine surge. The engine was throttled down a little, but throttle control simultaneously changed to an automatic mode which increased throttle setting with altitude (Automatic Thrust Restoration (ATR)). This in turn increased the intensity of the surging. The no. 1 engine surged 39 seconds later. At 76 resp. 78 seconds into the flight both the no. 2 and no. 1 engine failed after breakup of the stage 1 stators of both engines.
A no. 1 engine fire warning at 91 seconds into the flight made the crew activate the fire extinguishing system. A SAS captain traveling the passenger cabin realized that there were problems and hurried to the cockpit to assist the pilots. After breaking through the clouds at 980-820 feet, a field in the direction of flight was chosen for an emergency landing. The plane contacted trees at 121 knots and a major portion of the right wing broke off. The plane then struck sloping ground tail-first and slid along the ground for 110 meters. The fuselage was broken into three pieces, but there was no fire.
𝗖𝗮𝘂𝘀𝗲𝘀:
"The accident was caused by SAS' instructions and routines being inadequate to ensure that clear ice was removed from the wings of the aircraft prior to takeoff. Hence the aircraft took off with clear ice on the wings. In connection with lift-off, the clear ice loosened and was ingested by the engines. The ice caused damage to the engine fan stages, which led to engine surges. The surges destroyed the engines.
Contributory causes were: The pilots were not trained to identify and eliminate engine surging; ATR-which was unknown within SAS - was activated and increased the engine power without the pilot's knowledge."
5 сен 2024
