Turbine Conversions, Ltd. (TCL) was established in October 1990 with a mission to develop innovative turbine-powered conversion options for agricultural aircraft. Founded by William (Bill) Hatfield, a pioneer in the agricultural aviation industry with nearly 50 years of experience, TCL has grown into a global leader in aircraft modification and aviation solutions. In recognition of his lasting contributions to the industry, Bill was inducted into the National Agricultural Aviation Museum’s Hall of Fame.
Bill and his wife, Nancy, began their journey in agricultural aviation by founding Hatfield Spraying Service (HSS) in 1970 in Nunica, Michigan, shortly after Bill earned his pilot’s license and degree from Western Michigan University. Their early adoption of turbine technology—including the installation of the third Frakes Turbo Cat in Bill’s Ag Cat in the early 1970s—set the stage for their continued innovation in the field.
In 1989, their expertise caught the attention of Melex USA, which led to a collaboration on the development of a turbine conversion for the PZL M18 Dromader. To facilitate this project, Turbine Conversions, Ltd. was born. The company received its first Supplemental Type Certificate (STC) for the Dromader with a Pratt & Whitney turbine engine in 1990.
Over the past 35 years, TCL has secured a total of 40 STCs and expanded its offerings to include turbine conversion kits featuring both Pratt & Whitney and GE engines for agricultural aircraft—Ag Cat, Air Tractor 400 & 500 series, Thrush, and, most recently, the Akadi C206, TCL’s first civil aviation STC program.
In addition to turbine conversion kits, TCL has developed a robust product line including the industry-favorite Single Point Fueling System (SPF), the Hatfield Hydraulic Fire Gate (HHFG), and other specialized equipment designed to enhance safety, efficiency, and productivity in ag aviation.
As part of its long-term commitment to family values and sustainable growth, TCL has successfully transitioned to its second generation of leadership. Bill and Nancy’s daughter, Ann Hatfield Grahek, now serves as Vice President and General Manager, ensuring the company remains grounded in its founding principles while continuing to innovate. Her husband, Mark Grahek, leads the Sales team, bringing strong customer relationships and industry insight to the forefront of TCL’s global reach.
TCL continues to forge new partnerships around the world, committed to delivering the highest quality products at fair and competitive prices. With ongoing expansion efforts in South America and Africa, TCL is strengthening its international presence and ensuring that agricultural operators across the globe have access to reliable, performance-driven solutions.
TCL is a dynamic company focused on the design, development, and production of quality aviation products. Our strength lies in our diverse and experienced engineering and design team, whose collective knowledge drives continuous innovation. As we look to the future, we remain dedicated to supporting and advancing the agricultural aviation industry through strategic global partnerships, exceptional customer service, and enduring family values.
