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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. 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 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

• 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

Specifications (JT15D-5D)

General characteristics

• Type: Turbofan
• Length: 60.3 in (1,530 mm)
• Diameter: 27 in (690 mm)
• Dry weight: 630 lb (290 kg)

Components

• Compressor: Axial flow LP, centrifugal flow HP
• Fuel type: Jet A/A1

Performance

• Maximum thrust: 3,050 lbf (1,380 kgf; 13.6 kN)
• Specific fuel consumption: 0.562 lb/(lbf⋅h) (15.9 g/(kN⋅s)) at maximum thrust; 0.552 lb/(lbf⋅h) (15.6 g/(kN⋅s)) at cruise (typical)
• Thrust-to-weight ratio: ≈ 4.58

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. Philips; Phillips, Edward H. (1992). Beechcraft, pursuit of perfection : A history of beechcraft airplanes. Flying Books. ISBN 978-0-911139-11-2.
5. "Bygone Beechcrafts – Part Two".

Bibliography

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

External links

• PWC JT15D Product Overview page

This aircraft engine article is missing some (or all) of its specifications. If you have a source, you can help Misplaced Pages by adding them.

• 1960s turbofan engines
• Pratt & Whitney Canada aircraft engines
• Medium-bypass turbofan engines
• Centrifugal-flow turbojet engines