Pratt & Whitney Canada JT15D

The Pratt & Whitney Canada JT15D is a small turbofan engine built by Pratt & Whitney Canada. It was introduced in 1971 at 2200 lbf thrust, and has since undergone a series of upgrades to just over 3000 lbf thrust in the latest versions. It is the primary powerplant for a wide variety of smaller jet aircraft, notably business jets.

Design and development
The JT15D was first run in 1967. Its use of a centrifugal compressor as the high-pressure stage in a turbofan engine was followed in 1970 by the Garrett TFE731. The fan for the original JT15D-1 was aerodynamically scaled to 75 lb/sec using the much larger JT9D fan.

About 70% of the air passing through the fan goes down the bypass duct. The JT15D-4 and later variants use a "booster" axial stage behind the fan which runs at the same speed as the fan and directs the remaining 30% of the air into the high-pressure compressor, after which it passes into a reverse-flow annular combustor. The hot gases flow through a high-pressure turbine that drives the centrifugal compressor, and a low-pressure turbine that drives the fan and booster.

The engine was first run in August 1967 before being test flown on an Avro Canada CF-100 Canuck in an underslung external test pod. In 1975 a unique over-wing installation in place of Pratt & Whitney Canada PT6 turboprops was fitted to a Beechcraft Super King Air and flown for 93 hours to investigate the use of turbofan engines on that airframe.

Variants



 * JT15D-1:The first model was introduced to power the Cessna Citation I, then known as the Fanjet 500. Deliveries started in 1972, and eventually on 1,417 -1s were delivered.
 * JT15D-1A:
 * JT15D-1B:
 * JT15D-4:Introduced in 1973, improving thrust to 2500 lbf. The -4 was the primary engine for the Cessna Citation II, and went on to find use on the Mitsubishi Diamond 1A, Aerospatiale Corvette and SIAI-Marchetti S.211. Eventually 2,195 engines of the -4 series were delivered.
 * JT15D-4A:
 * JT15D-4B:
 * JT15D-4C:
 * JT15D-4D:
 * JT15D-5: Certified in 1983. The first versions delivered 2900 lbf and were used on the Beechjet 400A and Cessna T-47A. Several minor versions were introduced, the -5A for the Cessna Citation V, while the -5B powered the Beechcraft T-1A Jayhawk, the -5C the DASA Ranger 2000 and S-211A.
 * JT15D-5A:
 * JT15D-5B:
 * JT15D-5C:
 * JT15D-5D: Certified in 1993, increased thrust again, this time to 3045 lbf. The -5D is used on the Cessna UC-35A and Cessna Citation Ultra.
 * JT15D-5F:

Applications



 * Aérospatiale Corvette
 * Alenia Aermacchi M-311
 * Ball-Bartoe Jetwing
 * Boeing Bird of Prey
 * Beechcraft Beechjet 400
 * Cessna Citation I
 * Cessna Citation II
 * Cessna Citation V/Ultra
 * EADS Barracuda
 * Hawker 400
 * Honda MH02
 * Mitsubishi MU-300 Diamond
 * Northrop Grumman X-47A Pegasus
 * Raytheon T-1 Jayhawk
 * Rockwell Ranger 2000
 * Scaled Composites 401
 * Scaled Composites ARES
 * SIAI-Marchetti S.211/Aermacchi S-211
 * Sport Jet II
 * Stratos 716X