Honeywell TPE331 Engine Conversion Program

Honeywell tpe 331

The Honeywell TPE331 engine is a turboprop engine, originally designed in 1959 for the United States military. It was designed to power helicopters and rival the scaled-down versions of larger engines that other competitors were putting on the market at the time. When it finally entered production in 1963, its popularity quickly soared—with 700 engines delivered by 1973.

The Honeywell TPE331 Series of engines powers many turboprops on the market today, including, but not limited to:

  • Twin Commander 680/690/840/980/1000
  • Beech B100 King Air
  • Cessna 441 Conquest II
  • Mitsubishi MU-2
  • Fairchild SA 226/227 

The Honeywell TPE331 can also be fitted as a replacement for the original engines of (among others):

  • Beechcraft Model 18
  • Cessna 208 Caravan
  • Cessna Skymaster (Conroy Stolifter)

Today, with over 13,000 engines delivered and more than 120 million flight hours under its belt, the TPE331 is one of the most reliable and trusted turboprop engines in the industry today.

Honeywell TPE331 Specs

The Honeywell TPE331 is a single-shaft, direct drive turboprop with an integral gearbox. Its compact style lends itself to a variety of airframe installations. The direct drive feature is unique and allows for faster engine response times and a considerable increase in fuel efficiency. The operating altitude is 35,000 feet.

Horsepower ratings differ for airframe installations with the -10 capable of 1000 SHP. 

The engine is typically derated for better performance at altitude, and varies with airframe requirements.


Diameter: 22 inches (530mm)

Dry weight: 375 lbs. (approx.)

Compressor: Two-stage centrifugal

Combustion Chamber: Singular annular, Reverse Flow

Turbine: Three-stage axial

Maximum power output: 840 to 1000 SHP depending on model.

Overall pressure ratio: 10.55:1

The evolution of the Honeywell Engine

Pilots who fly aircraft powered by a Honeywell TPE331 know that it has exceptional horsepower and best-in-class fuel economy. It has a quick throttle response for shorter take-offs and long maintenance intervals, making it an ideal engine.

Several conversion programs are available and many airframes have been modified for use of the TPE series engines. By installing a 331 engine with a  conversion modification, it helps the aircraft:

  • Have a shorter take-off
  • Climb faster
  • Cruise further
  • Improve fuel efficiency

The conversions also aim to lower overall operating costs because of how efficiently the engine runs with the new components.

In years past, and through product development, the TPE331 has been greatly enhanced for better power and altitude performance. Certified in 1978, the -10 (or Dash 10) has earned a reputation for its performance and reliability across private, agricultural, utility, and military markets.

Upgrade Your Honeywell TPE331 Engine

The Dash 10 offers exceptional performance because the upgraded hot section results in a higher thermodynamic rating than other models —roughly 20% higher. This means that the TPE331-10 can maintain its maximum flat rate power until 16,000 feet compared to about 6,000 feet on earlier versions.

When converting to a Dash 10 engine, the process involves:

  • Removing the two engines from the aircraft
  • Upgrading the turbine sections with the Dash 10 components
  • Making any other engine modifications necessitated by the conversion
  • Upgrading the airframe with new parts to accommodate the reworked engines
  • Installation of the Dash 10 power plants

Currently, the conversion is available for TPE331-5 powered models. The Dash 10 components are manufactured by Honeywell, which licenses the conversion of Dash 5 engines to Dash 10 all under a Honeywell warranty.

Count on Winner Aviation to Upgrade Your Honeywell

Winner Aviation is the world’s oldest Honeywell TPE331 Factory Authorized Service Center. If your aircraft currently hosts the TPE331-5, talk with us about the Dash 10 conversion program and if it’s right for your needs.

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