Abstract
Studies indicate that a reduction in aircraft noise is attainable through the use of high-bypassratio, low-fan-tip-speed turbofan propulsors. The weight and installation penalties associated with high-bypass-ratio, direct-drive engines could be reduced significantly by incorporating a small, high-speed turbine to drive the fan through a reduction gear system that is designed to current criteria as represented by the Allison T56 reduction gear planetary system. Operational experience with the T56 reduction gear indicates that the addition of a geared fan drive system will not compromise engine reliability.
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