Flight tests of a fuel-saving upgrade to the Rolls-Royce T56 are set to begin at Edwards AFB, Calif., in July. The modified engine will be fitted to an Air National Guard-operated Lockheed Martin C-130H and is aimed at demonstrating flying qualities data as well as verifying overall improvements in performance. Flight tests are expected to run through August. Tom Hartmann, Rolls-Royce vice president for customer business, says flight tests mark the final qualification stage for the ...

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