It’s quite a bit more than 1.5… its 1.5 times the load they ever expect the plane to see… so 1X the max load they ever visualize the plane experiencing is quite a bit more than what it will ever see. Then, they add in another half of that. On the 787, when they bent the wings up… the wing looked almost like the letter U!! On the 777X pressurization check, where it ruptured… if people were in that plane, that pressure would be excruciatingly painful. Look for the videos of any Boeing plane wing stress test. Its impressive how far they bend!!
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