Helicopter Engines
PT6T TWIN-PAC®
Engine

PT6T TWIN-PAC®

A legend in the world of helicopters.
1,800 to 2,000 shaft horsepower class
The renowned Twin-Pac® has been the workhorse of medium class helicopters for four decades and is still going strong. The standard in its class for rugged dependability and excellent operating economics.

Overview

The PT6T Twin-Pac® alone created the foundation for Pratt & Whitney's success in the global helicopter market, with a heritage that is second to none.

Lasting dependability

Our customers associate the Twin-Pac® with lasting dependability since its service entry in the 1970s. PT6T engines continue to enjoy strong sales today based on the excellent reputation and performance of the Agusta and Bell 212 and 412 helicopters and the PT6T's unparalleled record of dependability, together with a steady influx of advanced, value-based technologies.

Versatility on a wide variety of applications

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 for 350 operators in 75 countries. More than 7,250 PT6T engine power sections have been produced, accumulating nearly 44 million flying hours in such applications as oil exploration, emergency medical service, maritime patrol and utility operations.

Global Customer Support

Operators of PT6T series engines are supported by Pratt & Whitney's industry-leading global customer support. This includes over 30 Pratt & Whitney-owned and designated service facilities around the world, more than 100 field support representatives on all major continents, two 24/7 Customer First Centres for rapid expert support, the most advanced diagnostic capabilities for this market and the largest pool of Pratt & Whitney rental and exchange engines in the industry. 
Features

Features of the PT6T engine family continue to expand

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.

Specs

The 1,800 to 2,000 shaft horsepower class, twin-power section PT6T has been produced in 12 models.
 

Thermodynamic
Power Class*
(Shaft Horsepower)

Mechanical
Power Class*
(Shaft Horsepower)

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 1,800 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.

Applications (10)

PT6T Twin Pac

  • PT6T-3

    Leonardo Helicopters AB212
    Sikorksy S-58T

  • PT6T-3B

    Bell Model 212
    Bell Model 412/SP/HP/EP
    Leonardo Helicopters AB412

  • PT6T-3BE

    Bell Model 412/SP/HP/EP
    Leonardo Helicopters AB412

  • PT6T-3BF

    Bell Model 412/SP/HP/EP

  • PT6T-3BG

    Bell Model 412/SP/HP/EP

  • PT6T-3D

    Bell Model 412/SP/HP/EP
    Bell CFUTTH CH-146 Griffon
    Leonardo Helicopters AB412

  • PT6T-3DF

    Bell Model 412/SP/HP/EP
    Leonardo Helicopters AB412

  • PT6T-3G

    Leonardo Helicopters AB412

  • PT6T-6

    Leonardo Helicopters AB212
    Leonardo Helicopters AB412
    Sikorsky S-58T

  • PT6T-9

    Bell Model 412 EPI

Services & support to keep you flying

Need support?

US & Canada
1 800 268-8000

International

Call: +8000-268-8000

or: +01-450-647-8000

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