A South Korean KF-16D crashed on Mar. 30 during an exercise and it has now been determined that a defective component on the engine was the cause.
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By Doo Ho Kim (http://www.flickr.com/photos/titicat/3810451257/) [CC BY-SA 2.0], via Wikimedia Commons
It was discovered that the engine casing came apart while in flight. The defect was traced back to the time it was manufactured. A hot tear had formed during the manufacturing process and the crack propagated over time.