Avcon Industries, Inc. and Butler Avionics, Inc., both subsidiaries of Butler National Corporation, have announced a significant development in aircraft safety. Avcon Industries has received Federal Aviation Administration (FAA) Supplemental Type Certificate $(STC)$ approval for the installation of non-halon portable fire extinguisher replacements in a range of Learjet models. This approval allows the installation of environmentally-friendly Halotron BrX-filled fire extinguishers, replacing existing halon extinguishers across the Learjet fleet. Avcon and Butler Avionics collaborated with a specialty fire extinguisher vendor to achieve this milestone, demonstrating their commitment to providing cost-effective regulatory solutions for legacy aircraft. The new extinguishers are designed for easy installation, with options for additional mounting locations in some Learjet models.