# Butler Avionics, Inc. ## Posts - [Repair vs. Replacement: A Practical Guide for Aging Learjet Avionics](https://butleravionics.com/repair-vs-replacement-a-practical-guide-for-aging-learjet-avionics/): General Manager, Butler Avionics When an avionics system starts acting up on an older Learjet, the first question most owners ask is the wrong one. They ask what it costs to replace, when the more useful question, at least at first, is whether the system needs to be replaced at all. A failing or degraded unit does not automatically mean an upgrade is due. In many cases, a repair gets the aircraft back to full function faster and cheaper than a replacement would, and understanding when that is actually true, rather than assuming it, is the first real decision point. What… - [BUTLER/AVCON NON-HALON AIRCRAFT FIRE EXTINGUISHERS EASA AND CAA APPROVED](https://butleravionics.com/butler-avcon-non-halon-aircraft-fire-extinguishers-easa-and-caa-approved/): EASA and CAA Issue STC for Avcon Non-Halon Replacement Portable Fire Extinguisher Solution New Century, KANSAS, December 4, 2025 – Butler National Corporation (OTCQX: BUKS), a leader in the growing global market for aircraft modification, maintenance, repair and overhaul (MRO) and a recognized provider of gaming management services, announces European Union Aviation Safety Agency (EASA) and United Kingdom Civil Aviation Authority (CAA) Supplemental Type Certificate (STC) approvals for the Avcon installation of non-halon portable fire extinguisher replacements in Learjets. Avcon received EASA STC No. 10088775 and CAA STC No. 00484 approving the replacement of existing halon fire extinguishers across the full… - [Butler Avionics Has EASA Approval of Class A TAWS STC for Learjet 35/36 Series Airplanes](https://butleravionics.com/butler-avionics-has-easa-approval-of-class-a-taws-stc-for-learjet-35-36-series-airplanes/): New Century, KANSAS, September 22, 2025 – Butler Avionics, Inc., a leading aircraft special mission integrator and avionics modification facility, and wholly owned subsidiary of Butler National Corporation (OTCQX: BUKS) announces European Union Aviation Safety Agency (EASA) Supplemental Type Certificate (STC) approval of the Class A TAWS (Terrain Awareness and Warning System), EASA STC No. 10088109, for Learjet Model 35/35A/36/36A airplanes. Butler received FAA STC ST04538CH and now has EASA STC approval for the Class A TAWS for the Learjet Model 35 and 36 series airplanes, which are installed with the Garmin GTN 750/750Xi Navigator. The Class A TAWS system features… - [Butler Avionics Announces EASA-Approved Replacement 2-inch Standby Altimeter and Attitude Indicator](https://butleravionics.com/butler-avionics-announces-easa-approved-replacement-2-inch-standby-altimeter-and-attitude-indicator/): RVSM Standby Altimeter Fix and Attitude Indicator Replacement Now EASA Approved for Learjets NEW CENTURY, KANSAS, February 19, 2025 – Butler Avionics with its affiliate Avcon Industries Inc., subsidiaries ofButler National Corporation (OTCQX: BUKS), and leading integrators and providers of support systems for business, commercial and military aircraft, announces the issuance of European Union Aviation Safety Agency (EASA) approval of a replacement 2-inch standby altimeter and separate standby attitude indicator installation into the Learjet Model 24, 25, 28, 29, 31, 31A, 35, 35A, C-21A, 36, 36A, 55, 55B, 55C and 60 airplanes. The EASA STC (No.10087798) approval of FAA STC (No.… - [Avcon Industries Acquires STC-Approved Installation of Non-Halon Aircraft Fire Extinguishers in Learjets](https://butleravionics.com/avcon-industries-acquires-stc-approved-installation-of-non-halon-aircraft-fire-extinguishers-in-learjets/): FAA Approval of Non-Halon Replacement Portable Fire Extinguisher OLATHE, KANSAS, August 21, 2025 – Avcon Industries, Inc. and its affiliate Butler Avionics Inc., subsidiaries of Butler National Corporation (OTCQX: BUKS), 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… - [Butler Avionics Announces EASA-Approved STC for Replacement Clock with USB Chargers in Learjets](https://butleravionics.com/butler-avionics-announces-easa-approved-stc-for-replacement-clock-with-usb-chargers-in-learjets/): Learjet Crew USB Charging Now EASA-Approved for CHRONOS® Digital Clock NEW CENTURY, KANSAS, August 15, 2025 – Butler Avionics, a subsidiary of Butler National Corporation (OTCQX: BUKS), a leading intergrator and provider of support systems for commercial and military aircraft and a recognized provider of management services in the gaming industry, announces the issuance of a European Union Aviation Safety Agency (“EASA”) Supplemental Type Certificate (“STC”) approval for a replacement clock that includes USB-A and USB-C chargers in Learjet Model 31A, 35, 35A, C21A, 36, 36A, 55, 55B, 55C, 60 and 60XR airplanes. The EASA STC approval of STC No. ST00235MC… - [Coming Soon: Non-Halon Aircraft Fire Extinguisher Solution for Learjets](https://butleravionics.com/coming-soon-non-halon-aircraft-fire-extinguisher-solution-for-learjet/): STC Program in Process for a Replacement Portable Fire Extinguisher for Learjet Aircraft Avcon Industries Inc. and Butler Avionics, subsidiaries of Butler National Corporation, are preparing to introduce a non-halon portable aircraft fire extinguisher replacement solution for the full range of Learjets. Designed to meet EASA regulations consistent with various global environmental standards, the new portable fire extinguishers utilize Halotron BrX, a next-generation clean agent alternative. These extinguishers are engineered as size-equivalent replacements for legacy halon extinguishers, minimizing downtime and simplifying retrofit. Avcon Industries Inc. and Butler Avionics collaborated with a leading manufacturer of firefighting products to deliver a compliant and… - [Butler Avionics Receives FAA Approval for TAWS-A STC Installation in Learjet 30 Series Aircraft](https://butleravionics.com/butler-avionics-receives-faa-approval-for-taws-a-stc-installation-in-learjet-30-series-aircraft/): Butler Avionics, Inc., a subsidiary of Butler National Corporation (OTCQX: BUKS), a provider of avionics solutions and FAA-certified repair station, announces Federal Aviation Administration (FAA) approval Supplemental Type Certificate (STC) No. ST04538CH for the installation of Class A Terrain Awareness and Warning System (TAWS-A) in Learjet 30 series aircraft. The FAA issued STC ST04538CH to Butler National Corporation, covering Learjet Models 35, 35A (C-21A), 36, and 36A when installed with the Garmin GTN 750 Navigator. The installation provide the Learjet aircraft with enhanced flight safety features that meet Part 25 airworthiness requirements, including: This FAA-approved solution is designed to reduce the… - [Butler Avionics Announces Garmin G700TXi STC for Learjet 35/36 Series](https://butleravionics.com/butler-avionics-announces-garmin-g700txi-stc-for-learjet-35-36-series/): NEW CENTURY, KANSAS, August 28, 2024 – Butler National Corporation (OTCQX: BUKS), a leading manufacturer and provider of support systems for commercial and military aircraft and a recognized provider of management services in the gaming industry, announces the receipt of Federal Aviation Administration (“FAA”) Supplemental Type Certificate (“STC”) approval of the installation of the Garmin G700TXi Flight Display System “Glass Cockpit” into the Learjet Model 35/35A(C-21A)/36/36A airplanes with FC-530 or 535 autopilots. The FAA STC approval, STC Number ST02036WI allows the installation of the Garmin G700TXi System in the Learjet Model 35/35A(C-21A)/36/36A airplanes with the FC-530/FC-535 autopilot. The replacement of the… - [FAA Approved Replacement 2-inch Standby Altimeter and Attitude Indicator](https://butleravionics.com/faa-approved-replacement-2-inch-standby-altimeter-and-attitude-indicator/): *RVSM Standby Altimeter Fix and Attitude Indicator Replacement FAA Approved for Learjets* NEW CENTURY, KANSAS, July 9, 2024 – Butler National Corporation (OTCQX: BUKS), a leading manufacturer and provider of support systems for commercial and military aircraft and a recognized provider of management services in the gaming industry, announces the issuance of a Federal Aviation Administration (“FAA”) Supplemental Type Certificate (“STC”) approval of a replacement 2-inch standby altimeter and separate standby attitude indicator into the Learjet Model 24, 24B/D/E/F, 25, 25B/C/D/F, 28, 29, 31, 31A, 35, 35A, C-21A, 36, 36A, 55, 55B, 55C and 60 airplanes. The FAA STC approval, STC Number… - [Charging Power in Your Learjet Cockpit New USB-Charger Clock!](https://butleravionics.com/usb-charging-power-in-your-learjet/): Introduction We at Butler Avionics understand the new need for powering portable electronic devices (PEDs) in your cockpit with the latest technology is essential for maintaining flight standards. We proudly offer the FAA-approved STC (Supplemental Type Certificate) No. ST00235MC to install the Mid-Continent CH93 Chronos Digital Clock with a USB Charger part 25. This STC includes Learjet models 24, 25, 31/31A, 35, 36, 55, and 60 series. Why Upgrade to the CH93 Chronos Digital Clock with charger? Versatile USB Charging Options One of the features of the CH93 Chronos Digital Clock is its built-in USB charging ports. The clock has multiple… - [Cessna-182 Garmin Upgrades](https://butleravionics.com/1ircw8bywgn8h7k7fqyrdh4tlnjkzi/): August 24, 2021 – Butler Avionics completes another legacy Cessna 182 upgrade featuring the Garmin GFC 500 autopilot, dual G5 attitude and HSI indicators and the Garmin GTN 750 Comm/Nav/GPS navigator. Butler Avionics has defined this cost-effective package to provide a long-term avionics upgrade for the Cessna 182. “The price point for the GFC 500 with the other components provide an enhanced level of safety and a tremendous increase of functionality compared to the factory-installed equipment. The functionality is so helpful for the novice pilot to the ATP!” Commented Chad Caylor, MEII/CFII and Avionics Manager. - [Butler Avionics obtains FAA STC approval of Garmin GTN 750Xi/650Xi](https://butleravionics.com/butler-avionics-obtains-faa-stc-approval-of-garmin-gtn-750xi650xi/): Butler Avionics obtains FAA STC approval of Garmin GTN 750Xi/650Xi Navigator Upgrades. The FAA amended STC ST02230SE to provide for the installation of the Xi Navigators in Learjets. - [Butler Avionics Receives Learjet 31A STC Approval of ADS-B for TCAS-II Equipped Aircraft](https://butleravionics.com/butler-avionics-receives-learjet-31a-stc-approval-of-ads-b-for-tcas-ii-equipped-aircraft/): Butler National Corporation (OTC QB: BUKS), a leader in aircraft special mission and avionics modification, announces Federal Aviation Administration (“FAA”) Supplemental Type Certificate (“STC”) approval of the Butler National ADS-B(Out) avionics solution in the Learjet Models 31 and 31A with TCAS II. - [Butler Avionics Receives Learjet 31A STC Approval of ADS-B](https://butleravionics.com/butler-avionics-receives-learjet-31a-stc-approval-of-ads-b/): Butler Avionics, Inc., a subsidiary of Butler National Corporation (OTC QB: BUKS), received Federal Aviation Administration (“FAA”) Supplemental Type Certificate (“STC”) approval for its ADS-B(Out) solution in the Learjet 31A. - [Butler Avionics Announces EASA STC Approval of GTN Navigator for Learjet 35/36](https://butleravionics.com/butler-avionics-announces-easa-stc-approval-of-gtn-navigator-for-learjet-3536/): Butler Avionics, Inc, a subsidiary of Butler National Corporation (OTC QB: BUKS), a leader in aircraft special mission and avionics modifications, engineering, integration, manufacturing and gaming industry service management, announces European Aviation Safety Agency (“EASA”) Supplemental Type Certificate (“STC”) approval of the Butler National Garmin GPS / Navigation / Communication Navigator GTN 750/650/725/625 installation in the Learjet Model 35, 35A, 36, 36A and Model 24/25 Series aircraft. - [Butler Avionics Announces EASA STC Approval for Learjet 35/36/60 ADS-B](https://butleravionics.com/butler-avionics-announces-easa-stc-approval-for-learjet-353660-ads-b/): Butler Avionics, Inc, a subsidiary of Butler National Corporation (OTC QB: BUKS), a leader in aircraft special mission and avionics modifications, engineering integration, manufacturing, and gaming industry service management, announces European Aviation Safety Agency (“EASA”) Supplemental Type Certificate (“STC”) approval of the Butler National ADS-B(Out) avionics solution in the Learjet Model 35, 35A, 36, 36A and Lear 60. - [Butler Announces Learjet 35/36 and Learjet 24/25 STC for ADS-B Compliance](https://butleravionics.com/butler-announces-learjet-3536-and-learjet-2425-stc-for-ads-b-compliance/): Butler National Corporation (OTC Pink: BUKS), a leading manufacturer and provider of support systems for commercial and military aircraft and a recognized provider of management services in diverse business groups including the gaming industry, announces Federal Aviation Administration (“FAA”) Supplemental Type Certificate (“STC”) approval to install the Butler National ADS-B(Out) avionics solution into the Learjet Model 24/25 and Learjet Model 35/36 series airplanes. - [Butler Announces FAA Approval of AHC-3000A Retrofit STC](https://butleravionics.com/butler-announces-faa-approval-of-ahc-3000a-retrofit-stc/): Butler National Corporation (OTCQB: BUKS), a leader in the growing global market for aircraft structural modification, maintenance, repair and overhaul (MRO) and a recognized provider of management services in diverse business groups, announces it’s subsidiary, Avcon Industries, Inc, received Federal Aviation Administration (“FAA”) approval of the installation of the Rockwell Collins AHC-3000A Attitude Heading Reference System into the Learjet Model 60 ## Pages - [Accessibility Statement](https://butleravionics.com/accessibility/): [privacykit policy=”accessibility”] - [Terms of Service](https://butleravionics.com/terms-of-service/): [privacykit policy=”terms”] - [Cookie Policy](https://butleravionics.com/cookie-policy/): [privacykit policy=”cookies”] - [Privacy Policy](https://butleravionics.com/privacy-policy/): [privacykit policy=”privacy”] - [Apply](https://butleravionics.com/apply/): [ajba_application_form] - [Home](https://butleravionics.com/) - [Open Positions](https://butleravionics.com/careers-jobs/): [bjb_job_listings] - [STC'S](https://butleravionics.com/our-stcs/) - [Services](https://butleravionics.com/services/) - [Resources](https://butleravionics.com/resources/) - [Installations](https://butleravionics.com/installations/) - [Contact](https://butleravionics.com/contact/) - [Insights](https://butleravionics.com/insights/) - [Careers](https://butleravionics.com/careers/) - [Airplane Troubleshooting](https://butleravionics.com/airplane-troubleshooting-2/) - [About](https://butleravionics.com/about/) ## Optional - [Agent (MCP protocol)](websites-agents.hostinger.com/butleravionics.com/mcp) [comment]: # (Generated by Hostinger Tools Plugin)