Shaping a new generation of helicopters, the PT6T Twin-Pac® has been the workhorse of 1,800 to 2,000 shaft horsepower, medium-class helicopters for four decades and is still going. The standard in its class for rugged dependability and excellent operating economics.
The PT6T Twin-Pac® created the foundation for Pratt & Whitney's success in the global helicopter market, with a heritage that is second to none.
Our customers associate the Twin-Pac® with lasting dependability since its service entry in the 1970s. PT6T engines continue to strong sales today based on the excellent reputation and performance of the Agusta and Bell 212 and 412 helicopters they power and the engine’s unparalleled record of dependability, together with a steady influx of advanced, value-based technologies.
The 1,800 to 2,000 shaft horsepower class, twin-power section PT6T has been produced in 11 models and its versatility has been demonstrated on a wide variety of applications around the world. The PT6T power helicopter missions including offshore, emergency medical, search & rescue and utility operations.
Plan your budget and minimize unscheduled maintenance with our Maintenance Programs: Our Eagle Service PlanTM (ESPTM) for single aircraft, our Fleet Service Plan (FSP) for growing fleets of two to five helicopters, and our Fleet Management Plan (FMP) for fleets of six or more aircraft.
You can keep your helicopter in the air with our SMART program. Our two-year, 500-hour Certified Pre-Owned program benefits buyers and sellers of used helicopters.
Use our oil analysis technology, now included as part of Eagle Service™ Plan (ESP™) coverage. You may also purchase it separately through the MyP&WC Power portal.
PT6T models are available ranging in shaft horsepower power from 1,800 to over 2,200 shaft horsepower. The latest aerodynamic and material technologies have enabled the PT6T engine to gain more power without significantly increasing in size. Other innovations have further enhanced ease of operation with the introduction of Electronic Engine Control (EEC) on some models. The PT6T basic configuration consists of two PT6A power sections coupled to a combining gearbox with a novel clutch system enabling both twin and single engine operation. The power section configurations are exactly the same as that of the PT6A turboprop, i.e. a two-shaft configuration consisting of a multi-stage compressor driven by a single-stage compressor turbine and an independent shaft coupling the power turbine to the output shaft through the combining reduction gearbox. In fact, the first PT6T-3 power section was the same as that of the PT6A-34 airline turboprop, laying the foundation for airline-type reliability in Pratt & Whitney's first helicopter engine.
Clutch system enabling twin and single engine operation
Reverse flow, radial inlet with screen for FOD (Foreign Object Damage) protection
3-stage axial and 1-stage centrifugal
Cooled vanes to maintain high durability
Low emissions, high stability, easy starting, durable
Forward facing output for fast hot section refurbishment
Other models with Automatic Fuel Control and manual override
The 1,800 to 2,000 shaft horsepower class, twin-power section PT6T has been produced in 11 models.
| Engine | Thermodynamic Power Class* (SHP) | Mechanical Power Class* (SHP) | Output Shaft Speed (RPM) | Height**(inches) | Width**(inches) | Length**(inches) |
|---|---|---|---|---|---|---|
| PT6T-9 Series | 2,243 | 1,855 | 6,000 | 32.5 | 43.5 | 66 |
| PT6T-6 Series | 1,970 | 1,875 | 6,600 | 32.5 | 43.5 | 66 |
| PT6T-3 Series | 1800 to 1,920 | 1,800 to 1,875 | 6,000 | 32.5 | 43.5 | 66 |
* Powers are approximate values at take-off. Available at sea level, standard day, static conditions, uninstalled.
** Dimensions are approximate values.
*** Equivalent Shaft Horsepower: includes estimated equivalent contribution of exhaust thrust.
Leonardo Helicopters AB212
Sikorksy S-58T
Bell Model 212
Bell Model 412/SP/HP/EP
Leonardo Helicopters AB412
Bell Model 412/SP/HP/E
Leonardo Helicopters AB412
Bell Model 412/SP/HP/EP
Bell Model 412/SP/HP/EP
Bell Model 412/SP/HP/E
Bell CFUTTH CH-146 Griffon
Leonardo Helicopters AB412
Bell Model 412/SP/HP/E
Leonardo Helicopters AB412
Leonardo Helicopters AB412
Leonardo Helicopters AB212
Leonardo Helicopters AB412
Sikorsky S-58T
Bell Model 412 EPI
Visit P&WC's Services Hub to find the right maintenance services and solutions available for your engine model.
Our Regional Sales Representatives can easily be located around the globe by visiting this page.
