![]() It was designed to be both a turboshaft (TSE331) and a turboprop (TPE331), but the turboshaft version never went into production. More than 700 had been shipped by the end of 1973. ![]() The TPE331 originated in 1961 as a gas turbine (the "331") to power helicopters. “Designed as a 575-horsepower engine it was not a scaled-down version of a larger engine, as competitors were offering.” Garrett AiResearch designed the TPE331 from scratch in 1959 for the military.
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