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AVCON RECEIVES FAA SUPPLEMENTAL TYPE CERTIFICATES FOR SPECIAL MISSION BOMBARDIER CHALLENGER 604, 605, AND 650 PLATFORMS

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Butler National (OTCQX: BUKS) subsidiary Avcon Industries received two FAA Supplemental Type Certificates for Bombardier Challenger 604, 605, and 650 aircraft.

The STCs cover underside rail mounting provisions for mission sensors (STC ST12213CH) and an underside-mounted radome (STC ST12278CH), expanding Avcon’s special mission platform portfolio.

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Positive

  • Two new FAA STCs for Challenger 604/605/650 special mission platforms
  • Certification of fuselage underside rail mounting provisions for mission sensors
  • Certification of fuselage underside-mounted radome for advanced radar systems
  • Expansion of Avcon special mission platform portfolio across multiple aircraft
  • Challenger platforms positioned for long-range ISR and maritime patrol missions

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  • None.

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Two new STCs expand The Avcon Special Mission Platforms to include Challenger Aircraft

NEW CENTURY, Kan., June 9, 2026 /PRNewswire/ -- Avcon Industries, Inc., a subsidiary of Butler National Corporation (OTCQX: BUKS) and leading aerospace manufacturer and systems integrator specializing in special mission aircraft modifications, has received two Federal Aviation Administration (FAA) Supplemental Type Certificates (STCs) for the Bombardier Challenger 604, 605, and 650 platforms.

The newly issued Avcon STCs approve the installation of the Avcon fuselage underside rail mounting provisions for sensors and mission equipment (STC No. ST12213CH) and the Avcon fuselage underside-mounted radome (STC No. ST12278CH) on Challenger 604, 605, and 650 aircraft (Type Certificate Data Sheet CL600-2B16).

"We are pleased to extend applicability of the Avcon Special Mission fuselage-mounted rail and radome systems to the Challenger 604, 605, and 650 platforms," said Marcus Abendroth, President of Avcon Industries. "The Challenger platform is widely utilized worldwide for intelligence, surveillance, reconnaissance, maritime patrol, and other special mission applications due to its combination of range, cabin volume, and operational flexibility. The Avcon team worked diligently to secure these certifications, and we appreciate their commitment, expertise, and technical achievement throughout the program."

Similar to the proven functionality of the Avcon Special Mission Rail systems installed on King Air and Caravan aircraft, the Challenger rail provisions are generically designed to support the integration of state-of-the-art mission sensors, including large radar systems and electro-optical/infrared (EO/IR) equipment. The Avcon Special Mission Radome incorporates advanced materials engineered to provide a range of transmissivity characteristics compatible with sophisticated synthetic aperture radar (SAR) systems and other advanced intelligence sensors.

Abendroth added: "These certifications significantly expand the Avcon special mission platform portfolio and position the Challenger 604/605/650 as an attractive option for customers requiring greater range, endurance, payload capacity, and mission flexibility. The Challenger certifications represent another step in the Avcon strategy to expand its portfolio of special mission aircraft modification solutions across multiple aircraft platforms."

For more information about the Avcon Challenger Special Mission modification or other Avcon Special Mission Products, please contact Christian Vila or Kalifa Dieme at Avcon Industries at +1 (913) 780-9595 or visit www.avconindustries.com.

About Avcon Industries, Inc.
Avcon Industries, Inc. provides engineering, structural modification, and systems integration solutions for business and commercial aircraft. The company performs special mission aircraft modifications serving business aviation, search and rescue, atmospheric research, ISR (Intelligence, Surveillance and Reconnaissance), forestry, and air ambulance markets, among others. Avcon is widely recognized for its expertise in regulatory-driven aircraft modifications that expand mission versatility.

Avcon Industries, Inc. is a wholly owned subsidiary of Butler National Corporation (OTCQX: BUKS), a publicly traded company headquartered in Olathe, Kansas.

Forward Looking Statements
This press release contains forward-looking statements within the meaning of applicable securities laws. These statements relate to future events or future performance and reflect management's expectations, estimates, and projections regarding, among other things, Avcon Industries expansion of approved modifications for the Bombardier Challenger 604, 605, and 650 platforms, anticipated customer demand for the certified systems, the continued development and certification of new capabilities across additional platforms, and the expected operational and mission benefits of the STCs described herein. Forward-looking statements are often identified by words such as "may," "will," "expect," "anticipate," "continue," "explore," "extend," or similar expressions.

These statements are based on current expectations and assumptions and are subject to a number of risks and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements, including but not limited to: changes in FAA regulatory requirements or certification timelines; shifts in defense and special mission market demand; the availability of customer aircraft for modification; supply chain and manufacturing constraints; and other factors beyond the company's control. Readers are cautioned not to place undue reliance on forward-looking statements. Avcon Industries, Inc. and Butler National Corporation undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by applicable law.

Media Contact
Marcus Abendroth
President – Avcon Industries, Inc.
Email: marcus@avconindustries.com
Phone: +1 (913) 780-9595

Learn more: www.avconindustries.com
Corporate site: www.butlernational.com

Cision View original content:https://www.prnewswire.com/news-releases/avcon-receives-faa-supplemental-type-certificates-for-special-mission-bombardier-challenger-604-605-and-650-platforms-302795483.html

SOURCE Avcon Industries, Inc.

FAQ

What FAA certifications did Avcon receive for Bombardier Challenger 604, 605, and 650 aircraft (BUKS)?

Avcon received two FAA Supplemental Type Certificates for Challenger 604, 605, and 650 aircraft. According to Avcon, the STCs cover fuselage underside rail mounting provisions (STC ST12213CH) and a fuselage underside-mounted radome (STC ST12278CH) for special mission applications.

How do the new Avcon FAA STCs affect Butler National (OTCQX: BUKS) special mission offerings?

The new FAA STCs expand Avcon’s special mission offerings to Challenger 604, 605, and 650 platforms. According to Avcon, these certifications broaden its portfolio of modification solutions across multiple aircraft, supporting intelligence, surveillance, reconnaissance, maritime patrol, and other special mission roles.

What capabilities do Avcon’s rail mounting provisions add to Challenger 604/605/650 aircraft?

The rail mounting provisions enable installation of various state-of-the-art mission sensors on Challenger aircraft. According to Avcon, the generically designed rails support large radar systems and electro-optical/infrared (EO/IR) equipment, similar to existing Avcon Special Mission Rail systems on King Air and Caravan platforms.

What is the purpose of the Avcon underside-mounted radome on Challenger special mission jets?

The underside-mounted radome is designed for advanced radar and intelligence sensors on Challenger jets. According to Avcon, it uses advanced materials engineered for transmissivity characteristics compatible with sophisticated synthetic aperture radar (SAR) systems and other high-end intelligence sensors.

Why are Challenger 604, 605, and 650 aircraft attractive special mission platforms for Avcon and BUKS?

Challenger 604, 605, and 650 aircraft combine range, cabin volume, and operational flexibility for special missions. According to Avcon, they are widely utilized for intelligence, surveillance, reconnaissance, maritime patrol, and other missions, now supported by Avcon’s certified rail and radome systems.

How do the new Challenger certifications fit into Avcon’s long-term strategy under Butler National (BUKS)?

The Challenger certifications support Avcon’s strategy to expand special mission modification solutions across multiple aircraft platforms. According to Avcon, they significantly broaden the special mission platform portfolio and position the Challenger 604/605/650 for customers needing greater range, endurance, payload, and mission flexibility.