PT6A

The PT6A-114A is flat-rated to produce 675 shaft horsepower (shp). Compared to its baseline counterpart (the PT6A-114 used in the initial Caravan models), the -114A features improvements that provide higher thermodynamic limits and greater power availability in "hot and high" (high elevation/high temperature) conditions.

Its key design attributes include:

Reverse-flow design: Improves accessibility for on-wing hot section inspections and maintenance.

High durability: Tailored for operations requiring frequent cycles (short flights), remote off-runway landings, and heavy hauling.

Versatile operations: Commonly utilized by cargo carriers, regional passenger airlines, medevac operators, and skydiving outfitters.

Primary Applications:

Cessna 208 and 208B Caravan I: The PT6A-114A serves as the standard powerplant for both the short-body Caravan and the stretched Super Van 9.

Reims-Cessna F406 Caravan II: While less common in North America, this twin-engine French utility and surveillance aircraft is another approved application for the -114A/114 engine family.

The Pratt & Whitney Canada PT6A-11AG is a highly specialized, 550-shaft-horsepower turboprop engine built explicitly for agricultural aviation. Its primary applications include heavy duty crop dusting, aerial seeding where it handles frequent takeoffs, high-cycle operations, and dusty environments.

Air Tractor AT 402A/402B
Schweizer G-164B AG-Cat Turbine

Air Tractor AT 402A/402B
Air Tractor AT 502B
Frakes Turbo Cat Model A/B/C
Schweizer G-164B AG-Cat Turbine

Cessna 208 Caravan (Select cargo and utility variants)

Cessna 425 Conquest I

Beechcraft King Air Models (Specific early/commuter variants)

Thrush/Schweizer Ag-Cat Series (Aerial application and dusting)

Air Tractor Series (Select utility models)

PZL-106 Turbo-Kruk

Cessna 208 Caravan, Pilatus PC-12, Beechcraft King Air series, and Viking Twin Otter.

Air Tractor (e.g., AT-500 series) and Thrush models.

Texan II and Embraer EMB-312 Tucano. [1, 2, 3, 4]

The Pratt & Whitney Canada PT6A-21 is a 550 shaft horsepower (SHP) turboprop. It is a de-rated derivative of the PT6A-27, purpose-built to provide robust reliability, excellent "hot and high" altitude performance, and a Time Between Overhaul (TBO) of 3,600 hours.

Its primary airframe applications include:

Beechcraft King Air C90 Series: The most prolific application, powering the C90A, C90B, and C90SE.

Turbine Conversions: Widely used for retrofitting piston aircraft into turbine power, notably the Beechcraft Bonanza (e.g., Royal Turbine Duke and Turbine Air Bonanza).

Utility & Regional: The Evektor EV-55 Outback and selected Cessna 206 conversions.