Officials there haven't determined what caused the dent in the Boeing 757, but there is no evidence of a bird strike.
Bergen says the crew aboard Flight 478 from Detroit reported a loud bang Monday and then the aircraft's radar became inoperative. The plane landed safely.
A Tampa International Airport spokeswoman initially blamed the dent on a bird. But Bergen says the crew reported the bang while flying at 18,000 feet -- an altitude too high for a bird.
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