The Altensteig mid-air collision was on the 11 August 1955 when two United States Air Force Fairchild C-119G Flying Boxcars collided and crashed three miles from Altensteig in West Germany. The aircraft were part of a formation of nine C-119s flying a training mission from Stuttgart-Echterdingen airfield, West Germany with troops from the United States Seventh Army. With all 66 on board both aircraft killed, it was, at the time, the worst air crash in Germany.
Just after 14:00 one of the aircraft on the right of a formation of three developed engine problems just after take off when it was around 4,000 feet, it lost height then climbed abruptly into the second aircraft colliding in mid-air. The first aircraft, serial number 53-7841, crashed and disintegrated with the loss of all 19 on board. The second aircraft 53-3222 continued for a while before it also crashed about 30 miles from Stuttgart in a wooded area and burst into flames, killing all 47 on board.
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