Pratt & Whitney T73

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JFTD12 engine on an Aircrane.JPG
JFTD12-4A mounted on an Erickson S-64E Aircrane
Type Turboshaft
Manufacturer Pratt & Whitney
Major applications Sikorsky CH-54 Tarhe
Sikorsky S-64 Skycrane
Number built 352[1]
Developed from Pratt & Whitney JT12

The Pratt & Whitney T73 (company designation JFTD12) is a turboshaft engine.[2] Based on the JT12A, the T73 powered the Sikorsky CH-54 Tarhe and its civil counterpart Sikorsky S-64 Skycrane flying crane heavy-lift helicopters.[3] Turboshaft versions for naval use are known as the FT12.


Basic military model, rated at 4,500 horsepower (3,355 kW) takeoff power and 4,000 horsepower (2,982 kW) maximum continuous power[4]
Higher-power military model with improved internal components; rated at 4,800 horsepower (3,579 kW) takeoff power and 4,430 horsepower (3,303 kW) maximum continuous power[4]
Civilian equivalent of T73-P-1[4]
Civilian equivalent of T73-P-700[4]


Specifications (T73-P-1)[edit]

Data from FAA Type Certificate E15EA

General characteristics

  • Type: Turboshaft
  • Length: 107.0 in (2,718 mm)
  • Diameter: 30.0 in (762 mm) maximum
  • Dry weight: 966 lbs (438 kg)


  • Compressor: nine stage axial compressor
  • Combustors: eight cans in annular configuration
  • Turbine: axial two stage gas generator turbine and axial two stage free turbine
  • Fuel type: aviation kerosene conforming to MIL-I-5161 E Grade I or II


  • Maximum power output: 4,500 horsepower (3,355 kW) takeoff, 4,000 horsepower (2,982 kW) maximum continuous; at sea level at or below -8°C (17°F)
  • Turbine inlet temperature: 688°C (1270°F)
  • Power-to-weight ratio: 4.66 hp/lb (7.66 kW/kg)

See also[edit]

Related development
Comparable engines
Related lists


  1. ^ Connors, p.285
  2. ^ Greg Goebel's Vectorsite
  3. ^ Janes: JT12
  4. ^ a b c d Type Certificate E15EA

External links[edit]