Powerful and versatile for single and twin-engine helicopters, the 1,000 shaft horsepower class PT6B is a 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 7 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


PT6B engines have been delivered to power helicopters around the world for emergency medical services, business and utility operations.

Incorporating 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.


The 1,000 shaft horsepower class PT6B series, a single engine configuration, has been produced in 7 models and its versatility has been demonstrated in a wide variety of applications.

Engine Thermodynamic Power Class* (SHP) Mechanical Power Class* (SHP) Output Shaft Speed (RPM) Height**(inches) Width**(inches) Length**(inches)
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.

Application (4)

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