BUTLER/AVCON NON-HALON AIRCRAFT FIRE EXTINGUISHERS EASA AND CAA APPROVED

Butler National Corporation (OTCQX: BUKS) announced that EASA and UK CAA issued Supplemental Type Certificates for Avcon's non-halon portable fire extinguisher replacements for Learjet aircraft.

Rhea-AI Summary

Butler National Corporation (OTCQX: BUKS) announced that EASA and UK CAA issued Supplemental Type Certificates for Avcon's non-halon portable fire extinguisher replacements for Learjet aircraft.

EASA STC No. 10088775 and CAA STC No. 00484 approve Halotron BrX-filled, size-equivalent extinguishers across a full Learjet model list; FAA previously issued STC No. ST12087CH. The approvals enable compliance with EU/Montreal Protocol rules requiring replacement of hand-held halon extinguishers by December 31, 2025. Avcon and Butler plan to stock kits with FAA Form 8130 and associated paperwork for rapid installation.

Positive

• EASA STC No. 10088775 approved for Avcon replacement extinguishers
• CAA STC No. 00484 approved covering full Learjet model list
• FAA previously issued STC No. ST12087CH for the same solution
• Approvals enable compliance with Dec 31, 2025 EU halon mandate
• Replacement units are size-equivalent with minimal fit impact

Negative

• December 31, 2025 compliance deadline creates installation timing pressure
• Some legacy Learjet models require additional mounting provisions

Argus Dec 4 session

+0.84% close to close Open Argus

Details

News Market Reaction – BUKS

On Dec 4, the day this news came out, BUKS closed 0.84% above the previous close.

Data tracked by StockTitan Argus for the Dec 4 session.

Key Figures

Halon ban start: 1994 Replacement deadline: December 31, 2025 EASA STC number: 10088775 +5 more

Halon ban start

1994

Halon production banned in EU member states since 1994

Replacement deadline

December 31, 2025

Mandated date to replace hand-held halon extinguishers

EASA STC number

10088775

EASA approval for Avcon non-halon Learjet extinguishers

CAA STC number

00484

UK CAA approval for Avcon non-halon Learjet extinguishers

FAA STC number

ST12087CH

Earlier FAA approval for non-halon Learjet extinguishers

Avionics business start

1969

Year Butler Avionics, Inc. was founded

Current price

$2.728

Pre-news trading price for BUKS

52-week high

$2.62

Pre-news 52-week high level for BUKS

Historical Context

5 past events · Latest: Dec 04

5 events

1. Dec 04

   Regulatory approvals

   24h Move

   +0.8%

   EASA and UK CAA STCs for non-halon Learjet fire extinguishers.

2. Sep 29

   Industry recognition

   24h Move

   +3.7%

   Northrop Grumman Silver Award for Butler National - Tempe performance.

3. Sep 11

   Earnings results

   24h Move

   +3.9%

   Strong Q1 FY2026 revenue, margin expansion and higher net income.

4. Aug 21

   Regulatory approval

   24h Move

   -0.9%

   FAA STC approval for non-halon fire extinguishers in Learjets.

5. Aug 13

   Share repurchase

   24h Move

   +0.7%

   Announcement of 2.41M share buyback and new $5M repurchase program.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Key Terms

supplemental type certificate, halon, ozone-depleting substance, montreal protocol, +1 more

5 terms

supplemental type certificate regulatory

"EASA and United Kingdom Civil Aviation Authority (CAA) Supplemental Type Certificate (STC) approvals"

A supplemental type certificate (STC) is an official approval from aviation regulators that allows a change or upgrade to an already certified aircraft or its components, like installing new engines, avionics, or structural modifications. For investors, STCs matter because they create permitted markets for aftermarket parts, upgrades, and maintenance services—similar to a quality stamp that lets a shop legally sell and install a costly retrofit, affecting future revenue, licensing income, and the resale value of aircraft.

halon technical

"Halon has been designated as an Ozone-Depleting Substance."

Halon is a class of man-made gases once widely used in fire suppression systems because they extinguish flames without leaving residue, acting like a silent fire extinguisher that floods a room and stops combustion. It matters to investors because halons are tightly regulated or banned in many places for damaging the ozone layer, so buildings, aircraft, or equipment that still use them face costs to replace systems, potential compliance liabilities, and limited supply or salvage markets that can affect asset value.

ozone-depleting substance technical

"Halon has been designated as an Ozone-Depleting Substance."

Ozone-depleting substances are chemicals that damage the Earth’s protective ozone layer, which acts like a sunblock blanket that shields life from harmful ultraviolet rays. Investors care because these chemicals are heavily regulated or banned, creating costs for companies that must replace them, clean up pollution, or face fines, while also shifting demand toward safer alternatives and new business opportunities.

montreal protocol regulatory

"Pursuant to European Union regulations and the Montreal Protocol, regulatory bodies"

An international environmental treaty that requires countries to phase out chemicals that damage the ozone layer, which shields the planet from harmful ultraviolet radiation. For investors, it matters because the treaty shapes demand, regulation and costs across industries that make or use affected chemicals—similar to how new traffic rules change which cars are legal to sell—creating risks for noncompliant firms and opportunities for companies that supply approved alternatives or cleaner technologies.

faa form 8130 regulatory

"We are committed to making the fire extinguisher kits with FAA Form 8130 approvals"

FAA Form 8130 is an official airworthiness certificate used to show that an aircraft, engine, or part meets U.S. safety and inspection standards before it can be sold, flown, or imported/exported. For investors, seeing this certificate is like finding a clean title on a used car — it reduces regulatory and operational risk, supports resale value, and signals the asset can legally enter service or be marketed to customers.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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EASA and CAA Issue STC for Avcon Non-Halon Replacement Portable Fire Extinguisher Solution

NEW CENTURY, Kan., Dec. 4, 2025 /PRNewswire/ -- 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 line of Learjet aircraft. This STC allows for the installation of Halotron BrX-filled fire extinguishers in compliance with EASA requirements. The new extinguishers are designed to be size-equivalent replacements, having minimal impact on fit and compatibility. The STC has an approved models list that includes: Learjet Models 24, 25, 29, 31, 31A, 35, 36, 35A (C-21A), 36A, 40, 45, 55, 55B, 55C, 60, 60XR, 70, and 75 aircraft. The Federal Aviation Administration (FAA) previously issued STC No. ST12087CH for the Avcon solution for replacement fire extinguishers.

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 are working diligently with a leading aviation fire extinguisher vendor to stock non-halon fire extinguishers to comply with the pending December 31, 2025 mandate. The EASA and CAA STC approval of the Avcon replacement fire extinguishers for Learjets are significant milestones," said Patrick Hupp, Avionics Manager. "I have had many inquiries for fire extinguishers to date. We are committed to making the fire extinguisher kits with FAA Form 8130 approvals and the associated STC paperwork available to customers with minimal time. We recognize the importance of meeting the deadline with an EASA and CAA STC-compliant solution. The EASA, CAA and FAA STCs reflect significant efforts to comply with the stringent issue paper requirements for fire extinguisher installations into airplanes. We believe that differentiates our solution for other non-STC options." Added Mr. Hupp. 

"The replacement non-halon extinguishers are engineered for straightforward installation in the same location as existing units, with provisions for additional mounting locations in some legacy Learjet models. The modification to replace the fire extinguisher should be accomplished very quickly. Avcon and Butler are known for cost-effective and timely regulatory aviation solutions." Concluded Mr. Hupp.

For more details, call 913-829-4606 or email sales@avconindustries.com.

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.

FOR MORE INFORMATION, CONTACT:

Patrick Hupp, Avionics Manager phupp@butleravionics.com or sales@avconindustries.com

Phone: +1 (913) 829-4606

THE WORLDWIDE WEB:
Please review www.avconindustries.com for pictures of our products and details about Avcon Industries, Inc.

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SOURCE Butler National Corporation

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Butler (BUKS) announce on December 4, 2025 about Learjet fire extinguishers?

Butler announced EASA STC No. 10088775 and CAA STC No. 00484 for Avcon non-halon Halotron BrX replacement extinguishers for Learjets.

Which Learjet models are covered by the Avcon EASA and CAA STCs (BUKS)?

The STC list includes Learjet Models 24, 25, 29, 31, 31A, 35, 36, 40, 45, 55, 60, 70 and others as specified in the approval.

How do the EASA/CAA approvals affect compliance with the EU halon phase-out for BUKS customers?

The approvals allow installation of Halotron BrX units that meet EASA/CAA rules, supporting compliance with the December 31, 2025 replacement mandate.

Has the FAA approved Avcon's non-halon extinguisher solution referenced by Butler (BUKS)?

Yes; the FAA previously issued STC No. ST12087CH for the Avcon replacement fire extinguisher solution.

Will Avcon/Butler supply ready-to-install extinguisher kits for Learjets (BUKS)?

Avcon and Butler stated they are stocking non-halon extinguishers and plan to provide kits with FAA Form 8130 and STC paperwork for quick installation.