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(KSL News) -- A small piece of metal caused millions of dollars damage to a fighter jet at Hill Air Force Base.
Air Force officials say it's the most expensive mistake since the fighter began deploying last year.
In October as a pilot started the twin engines on the jet, an airman noticed a five-inch safety pin sticking out of the landing gear. That pin was removed and got sucked into the jet's engine.
An investigation found it caused more than six and a half million dollars damage to the F- 22 fighter jet.
