![]() NASA gave GE a grant in February 1984 to continue its research, eventually building the experimental GE36. In the early 1980s, GE began to develop an unducted fan (UDF) engine, which was thought to be a more fuel-efficient option to propel short-haul airliners, a compelling proposition after the 1979 oil crisis. However, the GE90-115B, the most recent variant, is rated for a higher thrust (115,000 lbs) than the GE9X. ![]() It was the largest jet engine, until being surpassed in January 2020 by its successor, the 110,000 lbf (490 kN) GE9X, which has a 6-inch (15 cm) larger diameter fan. ![]() It is one of three options for the 777-200, -200ER, and -300 versions, and the exclusive engine of the -200LR, -300ER, and 777F. It entered service with British Airways in November 1995. The General Electric GE90 is a family of high-bypass turbofan aircraft engines built by GE Aviation for the Boeing 777, with thrust ratings from 81,000 to 115,000 pounds-force (360 to 510 kilonewtons).
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