May
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Boeing 777 Wing Ultimate Load Test
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Boeing 777 Wing Ultimate Load Test
The engineers predict the fatigue, corrosion and other load stresses. The margin placed upon the aircraft is as if the aircraft was aged through its expected life. For the 707, this was 10 years. For the 757/767, the design life was 25 years. I don’t know what the design life for the 777 is. However, if the expected life reduced the strength by 10%, then the load was increased by 11% (1/.9). Using that example, the 150% limit was 165% of the new aircraft loads.