S3 AeroDefense
S3 AeroDefense is a Milwaukee-based OEM-authorized distributor, FAA/EASA-approved repair station, and engineering services provider delivering military aircraft spares, MRO, and custom technical solutions to global defense operators across 55+ countries.
- Company typePrivate
- Founded2005
- HeadquartersMilwaukee, United States
- Headcount101–250
- GTM typeB2B
- OfferingServices
What S3 AeroDefense does
S3 AeroDefense (formerly S3 International) is a privately held aerospace aftermarket services company founded in 2005 and headquartered in a 73,000-square-foot facility in Milwaukee, Wisconsin. The company operates as an OEM-authorized stocking distributor and an FAA/EASA/UK CAA-approved repair station, providing military aircraft spare parts distribution, FAA Part 145 component-level repair and overhaul, and customized engineering and technical solutions (depot setup, aircraft modernization, program management, test stand design) to global military operators. S3 holds exclusive worldwide aftermarket distribution rights for Honeywell Control Systems and Moog's Military Global Sustainment, alongside multi-year Collins Aerospace agreements covering C-130 wheels and brakes across 70+ countries, and is an authorized distributor and repair center for Arrowhead, Parker, Triumph, CEF, TIGHITCO, Rogerson Kratos, Whippany, Essex, and Eaton product lines.
The business serves 55+ countries on six continents, supporting 16+ fixed-wing and rotary-wing defense platforms including the F-5, F-15, F-16, F-18, C-130, C-17, C-27J, P-3, T-50, CN-235, C-295, AH-64, CH-47, UH-60, Bell 412, and KUH-1. Revenue is generated through three streams: OEM-authorized spares distribution (hardware sales), component repair and overhaul services, and customized engineering/technical solutions, all on a custom-quoted, multi-year contract basis with military operators, MROs, and government customers worldwide. The customer base is concentrated in U.S. and allied defense ministries, with the U.S. Department of War relationship recently enabled by CMMC Level 2 certification achieved in March 2026. The company carries a dense regulatory stack (CMMC Level 2, AS9110C, ISO 9001:2015, AS9120, FAA/EASA/UK CAA Part 145, FAA SMSVP) and is led by co-founders Aksel Sidem (President), Jeff Wnuk (SVP Operations), and Sebastien Imbert (SVP Sales), with the Dermond family (former Derco Aerospace operators) providing board oversight.
S3 AeroDefense firmographics
Firmographics- Name
- S3 AeroDefense
- Legal name
- S3 AeroDefense LLC
- Website
- https://s3aerodefense.com
- Company type
- Private
- Founded year
- 2005
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- S3 AeroDefense is a Milwaukee-based OEM-authorized distributor, FAA/EASA-approved repair station, and engineering services provider delivering military aircraft spares, MRO, and custom technical solutions to global defense operators across 55+ countries.
- Ownership category
- akta.pro rank
S3 AeroDefense industry classification
Industry- Product category
- Military Aviation Aftermarket Support
- NAICS
- Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing (334511), Other Aircraft Parts and Auxiliary Equipment Manufacturing (336413), Aerospace Product and Parts Manufacturing (33641)
- SIC
- Search, Detection, Navagation, Guidance, Aeronautical Sys (3812), Aircraft Parts & Auxiliary Equipment, Nec (3728), Aircraft & Parts (3720)
- akta.pro primary industry
- Aerospace Landing Gear Components & Subsystems (IMABANAK)
Keywords
Where S3 AeroDefense is headquartered
LocationHeadquarters
- HQ city
- Milwaukee
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
S3 AeroDefense business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Supply Chain, Operations, Technology or R&D, Infrastructure, Marketing or Sales
Revenue model
- OEM Authorized Spares Distribution: S3 operates as an authorized stocking distributor for leading OEMs including Arrowhead Products, Collins Aerospace, Honeywell Aerospace, Moog, Triumph Aerospace, Parker Aerospace, and others. The company maintains in-stock inventory to support immediate customer needs for routine maintenance and urgent requirements.
- Component Repair and Overhaul Services: S3 operates an FAA and EASA-approved repair facility as an authorized repair center for CEF, Collins Aerospace, Honeywell, Moog, Triumph Aerospace, and Whippany Actuation Systems. The company performs component-level repairs and complex overhauls including airborne electrical power generation, hydraulic flight control, landing gear, air turbine starters, rotor drive gearboxes, fuel distribution, and mechanical/pneumatic/hydraulic components.
- Customized Engineering and Technical Solutions: S3 provides tailored solutions including depot setup and training, aircraft modernization, reverse engineering, system integration, proposal development, program management, and test stand design and fabrication.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | B2B aerospace parts and services with custom quoting |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels4 records
S3 AeroDefense product offering
Product offeringCore offering
S3 AeroDefense is an OEM-authorized stocking distributor of military aircraft spare parts and an FAA/EASA-approved repair station providing component-level repair and complex overhaul for fixed-wing and rotary-wing defense platforms. The company also delivers customized engineering and technical solutions including depot setup, aircraft modernization, system integration, proposal development, program management, and test stand design and fabrication.
Product overview
S3 AeroDefense is an award-winning provider of military aircraft spares, component repair services, and customized technical solutions to global military operators. The company operates from a 73,000-square-foot facility in Milwaukee, Wisconsin and serves customers in over 55 countries across six continents. Their core offerings include: (1) Spares Distribution – a global supplier of OEM-authorized military aircraft spare parts supporting legacy and active fixed-wing (F-5, F-15, F-16, F-18, C-130, C-17, C-27J, P-3, T-50, CN-235, C-295) and rotary-wing (AH-64, CH-47, UH-60, Bell 412, KUH-1) defense platforms across categories including avionics, powerplant, fuel systems, electrical power, hydraulics, ECS, flight controls, landing gear, fire protection, lighting, and GSE; (2) MRO Services – FAA and EASA-approved repair facility and authorized repair center for CEF, Collins Aerospace, Honeywell, Moog, Triumph Aerospace, and Whippany Actuation Systems, providing component-level repairs and complex overhaul; (3) Customized Engineering & Technical Solutions – supporting depot activation, sustainment, modernization, testing, and fleet readiness including depot setup & training, aircraft modernization, engineering services, proposal development, program management, and test stand design. The company holds strategic partnerships with industry-leading OEMs including Honeywell (exclusive worldwide distributor), Collins Aerospace, Moog (worldwide distributor for Military Global Sustainment), Arrowhead Products, Parker Aerospace, Triumph Group, and others.
Differentiator
Problem solved
Functional benefit
Products and services
- Spares Distribution Global supply of OEM-authorized military aircraft spare parts for legacy and active fixed-wing and rotary-wing defense platforms (F-5, F-15, F-16, F-18, C-130, C-17, C-27J, P-3, T-50, CN-235, C-295, AH-64, CH-47, UH-60, Bell 412, KUH-1). S3 is an authorized stocking distributor for Arrowhead Products, Collins Aerospace, Honeywell Aerospace, Moog, Triumph Aerospace, Parker Aerospace, and other OEMs, supporting customers in 55+ countries.
- Maintenance, Repair & Overhaul (MRO) Services In-house repair shop providing component-level repairs and complex overhaul programs for modern military aircraft components, including airborne electrical power generation, hydraulic flight control, landing gear, air turbine starters, rotor drive gearboxes, fuel distribution, and mechanical/pneumatic/hydraulic components. FAA #9S3R896B and EASA #145.6559 approved repair station, with UK CAA UK.145.50699 certification. AS9110C and ISO 9001:2015 certified quality management. Authorized repair center for CEF, Collins Aerospace, Honeywell, Moog, Triumph Aerospace, and Whippany Actuation Systems.
- Customized Engineering & Technical Solutions Tailored engineering and technical services for military aircraft operators worldwide, including depot setup and training, aircraft modernization, reverse engineering, system integration, proposal development, program management, and test stand design and fabrication. Supports performance-based logistics and long-term fleet readiness.
- CEF Industries Ball Screw Assembly Repair Service OEM-authorized repair center service for CEF Industries (a Transdigm company) C-130 ball screw assemblies, capable of overhauling, repairing, or replacing units in any condition. CEF ball screw assemblies offer high duty cycle, high-speed operation, and extended operational life.
Quantifiable outcome
- Honeywell UH-60 Air Turbine Starter delivers 5x reliability improvement with 4,000+ hours MTBF vs. previous models
- +2 more outcomes
Companies that use S3 AeroDefense
Customer profileNamed customers3 records
Segments4 records
Ideal customer profiles4 records
S3 AeroDefense technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
S3 AeroDefense partnerships and signals
Strategic signalPartnerships
15 partnerships are on record, tiered major, core and minor.
- Integrated Procurement TechnologiesmajorThree-year parts distribution agreement for C-130 Hercules wheels and brakes, strengthening logistics and hardware support for international C-130 operators. Partnership is part of Collins Aerospace's expanded distribution network alongside S3 AeroDefense and Derco.
- DercomajorThree-year parts distribution agreement for C-130 Hercules wheels and brakes under Collins Aerospace network. Derco, a Sikorsky Helicopter Company, has over $40 million in sales history with S3 co-founders. Partnership supports fleet readiness for C-130 operators worldwide.
- Moog, Inc.coreS3 AeroDefense secured Worldwide Distribution rights for Moog's Military Global Sustainment program, strengthening their role as an Authorized Repair Center. The partnership provides comprehensive support for Moog's primary and secondary flight control systems including pitch and roll trim actuators, power drive units, leading edge actuation, and active vibration control systems for military aircraft platforms.
- Rogerson KratosmajorDistribution agreement to support UH-60 and C-130 avionics upgrades, including Bell 412 Smart Display Digital Avionics Upgrade solution for mixed fleet operations.
- Honeywell AerospacecoreS3 AeroDefense is the exclusive worldwide aftermarket distributor for Honeywell Control Systems, including the UH-60 Air Turbine Starter (exclusive worldwide distributor) and military lighting systems (Grimes Lighting). S3 was named Honeywell Defense & Space 2024 Channel Partner of the Year for outstanding performance. Honeywell products supported include generators, air turbine starters, LED searchlights, and PAR 46/PAR 64 lighting systems.
- TIGHITCOcoreExclusive distribution agreement for TIGHITCO repairs, including UH-60 Main Rotor Spindle Repair and CH-47 Swash Plates. The agreement was announced at Farnborough, UK, expanding S3's rotary-wing support capabilities.
- Collins AerospacecoreS3 AeroDefense serves as an authorized distributor and repair center for Collins Aerospace, supporting avionics systems, NP2000 EPCS Propeller System Upgrade (C-130H select territories), and wheels and brakes. S3 is also an authorized repair center for Collins C-130 hydraulic pumps, valves, and wheel and brakes. The partnership was formalized through three-year parts distribution agreements for C-130 wheels and brakes supporting international operators in more than 70 countries.
- CEF IndustriescoreS3 is an OEM authorized repair center for CEF Industries, capable of overhauling, repairing, or replacing C-130 ball screw assemblies in any condition. CEF Industries is a Transdigm company with 65+ years of experience in mechanical and electro-mechanical actuation systems for aerospace.
- Arrowhead ProductsmajorAuthorized stocking distributor for Arrowhead Products, specializing in metallic and composite ducting assemblies for environmental control systems, bleed air, cooling, and anti-icing applications across multiple military platforms.
- Triumph AerospacemajorAuthorized stocking distributor and authorized maintenance center for Triumph Group products supporting various military aircraft platforms.
- Parker AerospacemajorAuthorized stocking distributor for Parker Aerospace products supporting hydraulic, pneumatic, and flight control systems across military platforms including F-16, F-18, CH-47, and Bell 412.
- Whippany Actuation SystemsmajorAuthorized repair center for Whippany Actuation Systems, providing repair capabilities for actuation products supporting military aircraft platforms.
- Essex IndustriesmajorSupplier partnership for Essex LOX converters (liquid oxygen systems) for F-18 Hornet and UH-60 Black Hawk life-support applications, delivering up to 4,300 gaseous liters at 75-120 PSIG.
- Vertex SolutionsminorPartnership providing mixed reality immersive training solutions for F-16 Fighting Falcon pilot readiness enhancement.
- EatonminorSupplier partnership for Eaton engine-driven pumps (P/N 887750, NSN 1650-01-465-0735) delivering critical hydraulic power for F-15 Eagle flight control systems.
Scale indicators7 records
Recent moves6 records
Expansion highlights6 records
S3 AeroDefense competitors and assessment
Company assessmentDirect peers
- AAR Corp: Public aerospace aftermarket provider offering parts distribution and MRO services to military and commercial operators including government and DoD customers. Closest scaled public peer to S3's spares-plus-MRO business model.
- Marshall Aerospace: UK-based military aerospace MRO and modification provider offering deep support on C-130, rotary-wing, and other defense platforms with international operator customer base highly comparable to S3's 55-country reach.
- Derco Aerospace: Milwaukee-based aerospace parts distributor founded by S3's chairman Eric Dermond, now formally a co-distributor under Collins Aerospace's C-130 wheels and brakes network alongside S3. Direct competitor and historical predecessor with overlapping C-130 Hercules focus, military customer base, and shared institutional DNA.
- StandardAero: Major MRO services provider supporting military rotary-wing and fixed-wing platforms with authorized repair capabilities comparable to S3's FAA/EASA Part 145 authorized repair center model. Directly comparable on helicopter component overhaul services.
- Integrated Procurement Technologies: Co-recipient alongside S3 of the January 2026 Collins Aerospace three-year C-130 wheels and brakes distribution agreement. Competes head-to-head for international military operator spares contracts with very similar OEM-backed distribution model.
Broad incumbents
- HEICO Corporation: Large aerospace aftermarket specialist with FAA-PMA parts distribution and authorized repair services (HEICO Aerospace, JetAvion) competing with S3's distribution-plus-MRO model across military and commercial platforms.
- Triumph Group: OEM partner (S3 is an authorized stocking distributor and maintenance center for Triumph Aerospace). Broader scope as a Tier-1 military airframe and component manufacturer with significant aftermarket support.
- TransDigm Group: Dominant aerospace proprietary components owner, including CEF Industries (key S3 OEM partner for C-130 ball screw repairs). Operates a broader portfolio across most aircraft systems, capable of vertically integrating aftermarket services that compete with S3.
- KLX Aerospace Solutions: Boeing-distributorship aerospace parts and MRO business with global aerospace aftermarket reach serving military and commercial operators. Direct comparability on parts distribution business model, scaled larger than S3.
Others
- Honeywell Aerospace: OEM partner that grants S3 exclusive worldwide aftermarket distribution of Honeywell Control Systems (UH-60 Air Turbine Starter, military lighting). Comparable indirectly as the ultimate product owner whose products S3 distributes, and which could otherwise insource aftermarket.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key highlights6 records
Customer concentration
S3 AeroDefense social profiles
Digital presenceS3 AeroDefense compliance and trust
Trust signalCompliance12 records
S3 AeroDefense financial estimates
Financial estimateRevenue estimate
Valuation estimate
S3 AeroDefense leadership team
Management profileNumber of profiles
Profiles7 records
S3 AeroDefense funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
S3 AeroDefense M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about S3 AeroDefense
What does S3 AeroDefense do?
S3 AeroDefense is an OEM-authorized stocking distributor of military aircraft spare parts and an FAA/EASA-approved repair station providing component-level repair and complex overhaul for fixed-wing and rotary-wing defense platforms. The company also delivers customized engineering and technical solutions including depot setup, aircraft modernization, system integration, proposal development, program management, and test stand design and fabrication.
Is S3 AeroDefense a public or private company?
S3 AeroDefense is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was S3 AeroDefense founded?
S3 AeroDefense was founded in 2005. It employs 101 to 250 people.
Where is S3 AeroDefense based?
S3 AeroDefense is headquartered in Milwaukee, United States, in the North America region.
How does S3 AeroDefense make money?
Three revenue lines are on record. OEM Authorized Spares Distribution is the primary driver. The others are component Repair and Overhaul Services and customized Engineering and Technical Solutions.
Who are S3 AeroDefense's main competitors?
Direct peers on record are AAR Corp, Marshall Aerospace, Derco Aerospace, StandardAero and Integrated Procurement Technologies. Broad incumbents are HEICO Corporation, Triumph Group, TransDigm Group and KLX Aerospace Solutions. Honeywell Aerospace is listed as an others.
Does S3 AeroDefense have an API?
No public API is recorded for S3 AeroDefense.
What industry is S3 AeroDefense in?
S3 AeroDefense's product category is Military Aviation Aftermarket Support. Its primary akta.pro industry code is IMABANAK, Aerospace Landing Gear Components & Subsystems. Its NAICS code is 334511 and its SIC code is 3812.