More than an engine

500 to 1,900 Shaft Horsepower Class


The PT6A engine family is the world's most popular engine in its class and is one of Pratt & Whitney's greatest success stories. Experience gained from the PT6A has helped spawn many of the engine families that have made Pratt & Whitney a world leader in the gas turbine engine market.

The PT6A Engine Family Continues to Advance, Incorporating the Latest Technologies in The Drive to Exceed Our Customers' Expectations

The best of both worlds: Proven technology built upon a remarkable body of engineering achievement that has written new chapters in aviation history in collaboration with our partners, and disruptive technology that continues to make new aircraft applications possible.  

Flexible engine architecture and modular reverse flow design simplify installation in both single- and twin-engine installations as well as tractor and pusher propeller configurations. 

Simple, on-wing maintenance is possible for most tasks, where other engines might need a shop visit. 

Easy access to all external components means there’s no other engine in General Aviation that’s easier to maintain than the PT6A. 

The novel PT6A configuration has proven to be a key attribute to its success: its rearward, reverse flow inlet and forward facing turbine section providing fast maintenance turn-around through on-wing hot section refurbishment in most aircraft installations. The PT6A is a two-shaft engine with a multi-stage compressor driven by a single-stage compressor turbine and an independent shaft coupling the power turbine to the propeller through an epicyclic concentric reduction gearbox.


The PT6A family of engines embodies three series of models with increasing power levels, referred to as PT6A "Small," "Medium" and "Large."

Engines Thermodynamic Power Class* (ESHP***) Mechanical Power Class*   (SHP)    Propeller Speed (Max. RPM)    Height** (Inches) Width** (Inches)    Length** (Inches)
PT6A' Small' (A-11 to A-140) 600 to 1075  500 to 900  1,900 to 2,200  21 to 25  21.5  61.5 to 64
PT6A 'Medium' (A-41 to A-62) 1,000 to 1,400 850 to 1,050  1,700 to 2,000 22 19.5  66 to 72
PT6A 'Large' (A-64 TO A-68) 1,400 to 1,900 700 to 1,900 1,700 to 2,000 22 19.5  69 to 75.5 

* 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.

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