S3 Aerodefense LLC

S3 Aerodefense LLC, a Wisconsin-based small business aerospace defense contractor, supplies aviation spare parts, specialized aircraft components, and maintenance, repair, and overhaul services to the Department of Defense as a prime contractor on Defense Logistics Agency vehicles, the Coast Guard, and Navy, competing predominantly in full-and-open, non-set-aside federal procurements. The company operates as a limited liability partnership headquartered in Glendale, Wisconsin, with performance facilities in River Hills, Wisconsin, and Los Alamitos and Valencia, California, serving military aircraft readiness across transport, helicopter, and fixed-wing platforms through NAICS 336411 (Aircraft Manufacturing) and PSC codes spanning airframe components, environmental control systems, and fire detection hardware.

Customer concentration is extreme: DLA Aviation accounts for 1,687 of 2,292 prime awards (71% of the award count) and $195.5 million of $247.7 million combined potential value (79% of dollars). DLA Land and Maritime is the distant second customer with 443 awards and $21.3 million. The Coast Guard, Naval Supply Systems Command, and DLA Construction and Equipment together account for less than 4% of total potential value. S3 Aerodefense competes almost entirely under full-and-open competition; Total Small Business set-asides and other designated set-asides recur across approximately 15–20% of the prime footprint, but the vendor's dominant posture is unrestricted bidding against all competitors on DLA vehicles.

Recent representative work spans duct assemblies (bleed air, oil cooler, engine bleed, air conditioning), sensing elements for forward-looking infrared and fire detection systems, spark gas igniters and turbine spark plugs, flexible and rigid couplings, hose and connector assemblies, insulation blankets, navigational lights, bearings, fastening hardware, and overhaul services on generator units, gas engine starters, and aircraft actuators. Prime contracts awarded in 2026 include a $2.5 million definitive contract with DLA Aviation for 1,024 units of spark gas igniters for KC-135 aircraft (January 2026), a $807 thousand purchase order for duct assembly bleed components from DLA Aviation (December 2025), and a $566 thousand order from DLA Land and Maritime for fusible plugs (November 2025). The vendor holds five single-award indefinite delivery contracts with DLA Aviation, each valued at approximately $2.0 to $2.5 million and extending through 2027–2029, which serve as the primary vehicle for task-order work. A Basic Ordering Agreement with Army Contracting Command Warren under the BOAST program (April 2026 through April 2031) provides a zero-dollar framework for Class IX supplies. Additional IDVs with DLA Land and Maritime (multiple single-award vehicles valued at $350 thousand each) support ignition leads, duct assemblies, and spur gearshafts.

Activity has grown consistently: 208 awards in 2022 to 431 in 2025, with 110 recorded in 2026 (partial-year data). The source covers approximately 2,377 total awards, of which 2,292 are prime and 85 are sub-awards. Recompete exposure in the next twenty-four months is $36.3 million across 309 awards, primarily DLA Aviation task orders reaching completion or renewal. S3 Aerodefense subcontracts to major defense integrators including The Boeing Company (C-17 sustainment, KC-46 material support, virtual fleet requirements), Leidos (Romania foreign military sales repair work), and S&K Federal Services (Army security assistance foreign military sales repair of digital equipment and gas turbine starters). The vendor also performs as a sub to L3Harris (RC-135 sustainment) and Defense Systems & Solutions (V-22 materials), reflecting integration into broader aerospace sustainment ecosystems led by prime contractors.

Set-aside posture is mixed but tethered to small-business certification. The majority of S3 Aerodefense awards carry no set-aside designation and compete in full-and-open procurements, demonstrating the vendor's ability to win against unrestricted competition on DLA Aviation's supply chain. Roughly 15–20% of awards include Total Small Business designations, particularly on DLA Land and Maritime and Construction and Equipment IDVs, indicating selective use of small-business set-asides where available. The vendor does not hold 8(a), HUBZone, SDVOSB, or WOSB certifications named in the source material; S3 Aerodefense competes as a small business but without additional protected categories.

NAICS concentration reflects specialization: 866 awards under Other Aircraft Parts and Auxiliary Equipment Manufacturing (336413), 249 under Aircraft Manufacturing (336411), and 150 under Motor Vehicle Electrical and Electronic Equipment Manufacturing (336322). PSC codes are similarly focused: 728 awards for Airframe Structural Components, 265 for Aircraft Air Conditioning/Heating/Pressurizing Equipment, and 236 for Hose and Flexible Tubing. The portfolio demonstrates vertical depth in a narrow, high-value niche—military aircraft sustainment components and MRO—rather than horizontal breadth across federal markets. Obligated dollars total $196.4 million (79% of combined potential value), indicating strong execution and payment flow.

As a small business, S3 AeroDefense, LLC. is an award winning provider of military aircraft spares, component repair services, and supply chain solutions to global military operators. S3's global presence extends to over 55 countries on 6 continents.

S3 AeroDefense is driven by a vision to deliver cutting-edge and cost-effective solutions to military aviation aftermarket sectors.