Back when engineering departments dominated engine manufacturing companies, a powerplant was not certified for flight until it had run well more than 10,000 hr. in development test cells and in flight. For example, both the Rolls-Royce RB211-22 and Pratt & Whitney JT9D-3 had around 14,000 hr. of development testing, and the progenitor of the General Electric CF6-6, the TF39, had more than 17,000 hr., before they were approved for service. They all averaged well over 500 hr. per ...

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