When Donald Douglas Sr. said in 1958 at the first flight of the DC-8 that every major advance in aviation had been due to the development of the engine, he couldn’t possibly have imagined the GE90. The airline industry was still tolerating an inflight shutdown rate of 1 per 1,000 hr. on the DC-7C, and while the initial 11,000-lb.-thrust turbojets on the 707 and DC-8 (with a cruise SFC of 0.90 lb. of fuel per lb. of thrust per hr.) were better, the IFSD rate was still about 0.2 per ...

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