Avcon Industries, Inc., a subsidiary of Butler National Corporation, announced on August 21, 2025, that it has received Federal Aviation Administration (FAA) Supplemental Type Certificate (STC) approval, ST12087CH. This approval authorizes the installation of non-halon portable fire extinguisher replacements across a wide range of Learjet models, including Models 24, 25, 29, 31, 31A, 35, 36, 35A (C-21A), 36A, 40, 45, 55, 55B, 55C, 60, 60XR, 70, and 75 aircraft.
The 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. Halon has been designated an Ozone-Depleting Substance, and EASA regulations, in line with the Montreal Protocol, mandate the replacement of hand-held Halon fire extinguishers in airplane cabins and crew compartments with suitable alternatives by December 31, 2025.
Avionics Manager Patrick Hupp stated that Avcon and Butler Avionics collaborated with a specialty fire extinguisher vendor to make these non-halon solutions available. The new extinguishers are size-equivalent replacements, ensuring minimal impact on fit and compatibility, and are engineered for straightforward installation. An application is currently being made for EASA validation of this STC approval.
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