Think that's scary?
Airplane parts including entire engines are engineered with a 10% safety factor. Found this out through a co-worker that helped design engines at Pratt.
Meaning that if a 1000 pound force is calculated, the raw materials will fail at 1101 pounds by design. Enjoy your flight! Having said that, the amount of engineering and testing that is done is also amazing. Apparently Pratt had to scrap an entire engine and start from scratch after one failed on the test stand unexpectedly. That is, they had to rewrite the procedure on how to design an engine after doing root cause analysis. The failure was that early in the process