AVCON INDUSTRIES ACQUIRES FAA STC-APPROVED INSTALLATION OF NON-HALON AIRCRAFT FIRE EXTINGUISHERS IN LEARJETS

FAA Approval of Non-Halon Replacement Portable Fire Extinguisher

OLATHE, Kan., Aug. 21, 2025 /PRNewswire/ -- Avcon Industries, Inc. and its affiliate Butler Avionics Inc., subsidiaries of Butler National Corporation (OTCQX: BUKS) and leading manufacturers and systems integrators for special mission aircraft modifications, announce Federal Aviation Administration (FAA) Supplemental Type Certificate (STC) approval for the installation of non-halon portable fire extinguisher replacements in Learjet Models 24, 25, 29, 31, 31A, 35, 36, 35A (C-21A), 36A, 40, 45, 55, 55B, 55C, 60, 60XR, 70, and 75 aircraft.

Avcon received FAA STC No. ST12087CH authorizing the replacement of existing halon fire extinguishers across the full line of Learjet aircraft. This STC allows for the installation of Halotron BrX-filled fire extinguishers, which are designed for ease of retrofit and compliance with European Union Aviation Safety Agency (EASA) requirements. An application is being made for EASA validation of the Avcon fire extinguisher STC approval. The new extinguishers are designed to be size-equivalent replacements, having minimal impact on fit and compatibility.

Halon has been designated as an Ozone-Depleting Substance. Halon production has been banned in EU member states since 1994, although it has been allowed for certain "critical uses," including in some aircraft systems.  Pursuant to European Union regulations and the Montreal Protocol, regulatory bodies, including EASA, have required that hand-held Halon fire extinguishers in airplane cabins and crew compartments be replaced with suitable alternatives by December 31, 2025.  

"Avcon and Butler Avionics teamed with a leading specialty fire extinguisher vendor to make available non-halon fire extinguishers to comply with the pending EASA mandate, and obtain STC installation approval for Learjets," said Patrick Hupp, Avionics Manager. "The new extinguishers are engineered for straightforward installation in the same location as existing units, with provisions for additional mounting locations in some legacy Learjet models. We are working diligently to obtain EASA approval for the replacement fire extinguisher installation. Avcon and Butler Avionics are also working to add additional models to the STC-approved model list (AML). Avcon and Butler continue their commitment to supporting legacy aircraft with cost-effective regulatory solutions."

For more details, call 913-829-4606 or email [email protected].

Butler Avionics Business:
Since its inception in 1969, Butler Avionics, Inc. offers avionics integration, installation and repair services.  Butler Avionics works with its parent company, Butler National Corporation, and affiliate Avcon Industries, Inc. to provide custom and regulatory avionics solutions for business, air transport and general aviation aircraft.  Butler Avionics is a FAA Repair Station.

Avcon Industries Business:
Avcon Industries, Inc. operates in the Aerospace business and focuses on the modification of business and commercial aircraft, which includes both complex structural modifications and system integrations.  Avcon specializes in providing products and services to the business marketplace, the forestry and atmospheric research space, the Intelligence, Surveillance and Reconnaissance (ISR) sector, and the air ambulance segment.

Avcon is recognized for providing solutions to regulatory-driven aircraft modifications.

Avcon Industries, Inc. is a wholly owned subsidiary of Butler National Corporation.  Butler National Corporation is a publicly traded stock company with at ticker symbol:OTCQX: BUKS.

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SOURCE Avcon Industries, Inc.