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Taking precise measurements is paramount to ensuring aircraft flight safety. 1st Lt. Eric Yerly, a depot liaison engineer deployed to Southwest Asia gives an example of how a small measurement can make a huge difference. “One eighth of an inch doesn’t sound like a lot right,” said Yerly. “But 1/8 of an inch to a 3/32 rivet is a lot. The thickness of a part, its size, what it’s made out of, how it’s installed…all those things play into the safety of the airplane. So if you install a rivet and you don’t squeeze it fully, it doesn’t fill the hole all the way, so it vibrates a little bit. Well the vibration over time creates a crack which causes the rivet to fall out which makes the two pieces that it was holding together loose. You lose one rivet and you don’t have a large enough, what we call margin of safety, it can actually cause all the other rivets to fail and it can actually cause the aircraft to crash.” (Courtesy photo)
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