JT15D
Aerocardal JT15D
Type Turbofan
National origin Canada
Manufacturer Pratt & Whitney Canada
First run 1967
Major applications Cessna Citation I
Cessna Citation V
Hawker 400
SIAI Marchetti S.211
Number built >6,000

The Pratt & Whitney Canada JT15D is a small turbofan engine built by Pratt & Whitney Canada. It was introduced in 1971 at 2,200 lbf (9,800 N) thrust, and has since undergone a series of upgrades to just over 3,000 lbf (13 kN) 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.[1] The fan for the original JT15D-1 was aerodynamically scaled to 75 lb/sec using the much larger JT9D fan.[2]

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.[3] 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.[4][5]

Variants

A JT15D at the Frontiers of Flight Museum
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 2,500 lbf (11,000 N). 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 2,900 lbf (13,000 N) 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 3,045 lbf (13,540 N). The -5D is used on the Cessna UC-35A and Cessna Citation Ultra.
JT15D-5F

Applications

Cessna Citation installation

Specifications (JT15D-5D)

General characteristics

  • Type: Turbofan
  • Length: 60.3 inches (1531mm)
  • Diameter: 27 inches
  • Dry weight: 630 pounds

Components

  • Compressor: Axial flow LP, centrifugal flow HP
  • Fuel type: length

Performance

EngineTakeoff
thrust (kN)		Continuous
thrust (kN)		Length (mm)Fan
Diameter(mm)		Diameter.(mm)Dry
weight (kg)		Bypass
ratio
JT15D-19.8　9.31506691223.53.3
JT15D-411.12　10.5616006862532.6
JT15D-4C11.12　　10.5616006862612.6
JT15D-512.92　16002872
JT15D-5A12.92　16002872
JT15D-5B12.92　16002922
JT15D-5C14.21　16003022
JT15D-5D13.56　1531520686292.63.3
JT15D-5F12.92　16002882

References

Notes

  1. ↑ The Development Of Jet And Turbine Aero Engines 4th Edition,Bill Gunston 2006,ISBN 0 7509 4477 3,p.185.
  2. ↑ Gunston 1989, p.131.
  3. ↑ "On Test at Longueuil". Flight International: 263. 13 February 1969.
  4. ↑ https://archive.org/details/beechcraftpursui0000phil/page/66/mode/2up
  5. ↑ https://kingairmagazine.com/article/bygone-beechcrafts-part-two/

Bibliography

  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
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