- Pratt & Whitney JT9D
The
Pratt & Whitney JT9D engine was the firsthigh bypass ratio jet engine to power awide-body aircraft . Its first initial application was theBoeing 747 -100, the original "Jumbo Jet". It was the company's first high-bypass-ratio turbofan.Pratt & Whitney's designated successor to the JT9D family is the PW4000, which features fewer parts, greater reliability, and lower base selling price.
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