Avcon Industries Expands Capabilities with FAA Certifications for Challenger 604, 605, and 650 Models

Avcon Industries Secures FAA Supplemental Type Certifications

Avcon Industries, Inc., a well-regarded subsidiary of Butler National Corporation, is proud to announce that it has successfully obtained two supplemental type certificates (STCs) from the Federal Aviation Administration (FAA) for the Bombardier Challenger platforms 604, 605, and 650. This significant achievement marks a milestone in enhancing the special mission capabilities of these aircraft.

On June 9, 2026, the company disclosed that the newly issued STCs permit the installation of innovative fuselage underside rail mounting provisions designed for sensors and other mission-specific equipment (STC No. ST12213CH) as well as a specially-designed fuselage underside-mounted radome (STC No. ST12278CH). These new modifications expand the operational scope of the Challenger series, which is already well recognized for its versatility and reliability in various intelligence, surveillance, reconnaissance, and maritime patrol missions around the globe.

Marcus Abendroth, the President of Avcon Industries, expressed his enthusiasm: “We are thrilled to provide these extended capabilities for the Challenger 604, 605, and 650 models. These aircraft are widely used across the world for critical missions due to their impressive range, spacious cabin, and operational adaptability. The diligent efforts of our team have enabled us to obtain these important certifications, reflecting our commitment to technical excellence.”

Similar to the established functionality of Avcon's Special Mission Rail systems which have been integrated into King Air and Caravan aircraft, the rail provisions designed for the Challenger series accommodate advanced mission sensors, including large radar systems and state-of-the-art electro-optical/infrared (EO/IR) equipment.

The Avcon Special Mission Radome utilizes cutting-edge materials that are specifically engineered to provide optimal transmissivity characteristics compatible with advanced synthetic aperture radar (SAR) systems alongside other sophisticated intelligence sensors.

Abendroth further added, “These certifications significantly broaden our special mission portfolio, positioning the Challenger 604, 605, and 650 as prime choices for customers requiring enhanced range, endurance, payload capacity, and mission versatility. This achievement aligns with our strategic vision to diversify our special mission aircraft modification offerings across a range of platforms.”

For aviation enthusiasts and customers interested in learning more about the Avcon Challenger Special Mission modification or other products available from Avcon, the company encourages inquiries directed to Christian Vila or Kalifa Dieme at Avcon Industries. They can be contacted at +1 (913) 780-9595 or by visiting their website at www.avconindustries.com.

About Avcon Industries, Inc.

Avcon Industries, Inc. specializes in engineering, structural modifications, and systems integration solutions tailored for business and commercial aircraft, providing special mission aircraft modifications serving various sectors including search and rescue, atmospheric research, and air ambulance services. The company is acclaimed for its expertise in regulatory-driven modifications that significantly broaden operational capabilities.

As a wholly owned subsidiary of Butler National Corporation, which trades publicly under the ticker symbol BUKS and is headquartered in Olathe, Kansas, Avcon Industries continues to expand its reputation in the aerospace manufacturing and modification industry.

Forward-Looking Statements

This announcement may contain forward-looking statements under applicable securities laws, which pertain to future events and performance reflective of management’s expectations. These statements encompass Avcon's growth, the anticipated demand for certified systems, and the potential operational advantages of the newly certified modifications. Investors are advised to exercise caution as these statements are subject to numerous risks and uncertainties that could lead to actual results differing materially.