Pratt & Whitney Canada JT15D

The JT15D is a small turbofan built by Pratt & Whitney Canada, introduced in 1971 at 2,200 pounds-force of thrust and since raised to just over 3,000. It first ran in August 1967, and the fan of the original JT15D-1 was aerodynamically scaled down from the much larger JT9D fan first used on the Boeing 747. About 70 percent of the air passing through the fan goes down the bypass duct, and later versions add a booster stage ahead of a centrifugal high-pressure compressor and a reverse-flow annular combustor. It became the principal powerplant of many small business jets, beginning with the Cessna Citation I, with deliveries from 1972, and later the Citation II, the Beechjet 400 and the T-1 Jayhawk trainer.