Continuing in the steps of the legendary PT6.
1,000 shaft horsepower class
Powerful and versatile for single and twin-engine helicopters. Direct derivative of the famous PT6T and PT6A family of engines.


The initial models in the PT6B Series was derived directly from the legendary PT6T Twin-Pac®, benefiting from its renowned dependability and performance.

Versatility on a wide variety of applications

The 1,000 shaft horsepower class PT6B series, a single engine configuration, has been produced in 6 models and its versatility has been demonstrated on a wide variety of applications. More recently, the PT6B-67A engine was developed with the PT6C-67A and PT6C-67C engine models providing the basis. 

About the PT6B engine family

More than 469 PT6B series engines power aircraft in service with 160 operators in 50 countries, having accumulated more than 1.7 million flying hours in such applications as emergency medical service, business and utility operations.

Global Customer Support

Operators of PT6B 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. 

PT6B Series engines incorporate the latest technologies to exceed our customers' expectations

Key innovative design features have been introduced to the PT6B Series over the years to further increase its appeal in the market. The PT6B-37A has an automatic fuel control and an electronic power turbine governor with a manual back-up – a unique feature for single engine operations.

The PT6B Series is derived directly from the PT6T-3D power section with an offset output gearbox, including clutch system. The basic engine configuration is exactly the same as that of the PT6T and 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 offset reduction gearbox. In fact, the base engine hot section is very similar to the PT6A-34 airline turboprop, thus continuing the heritage of airline-level dependability in Pratt & Whitney's helicopter engines.



Power Class*
(Shaft Horsepower)

Power Class*
(Shaft Horsepower)

Output Shaft




PT6B-37A 1,000 900 4,373 35 19.5 64.5
PT6B-36 1,000 900 6,409 32 19.5 59.2
* Powers are approximate values at take-off. Available at sea level, standard day, static conditions, uninstalled.
** Dimensions are approximate values.

Applications (4)

  • PT6B-36A

    Sikorsky S-76B
  • PT6B-36B

    Sikorksy S-76B
  • PT6B-37A

    Leonardo A119 Koala
  • PT6B-67A

    AVIC Changhe Aviation Z8F/AC313

Services & support to keep you flying

Need support?

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