SBA size standard
1,250 employees
Measured by average number of employees over the last 24 months
SBA table effective March 2023
Official definition
This U.S. industry comprises establishments primarily engaged in (1) manufacturing aircraft parts or auxiliary equipment (except engines and aircraft fluid power subassemblies) and/or (2) developing and making prototypes of aircraft parts and auxiliary equipment. Auxiliary equipment includes such items as crop dusting apparatus, armament racks, inflight refueling equipment, and external fuel tanks.
FY2025 federal spending
The Department of Defense bought 99% of the $19.8B obligated under 336413 in FY2025.
- Contract awards
- 81,665
- Contract vehicles (IDVs)
- 4,008
Top buying agencies
- Department of Defense$19.6B
- Department of Homeland Security$191.4M
- General Services Administration$33.5M
- National Aeronautics and Space Administration$10.9M
- Department of Transportation$5.4M
FY2025 federal contract obligations, USAspending.gov
NAICS 336413 obligated $19.8 billion in FY2025 across 81,665 contract awards, more awards than any other aerospace code by a wide margin. DoD is $19.6 billion of that, with DHS at $191 million and GSA at $34 million. The shape matters more than the buyer mix: average obligation under $250,000, the signature of DLA spares and sustainment buying.
What belongs here
Aircraft parts and auxiliary equipment other than engines and fluid power subassemblies, plus prototypes of the same. Auxiliary equipment is broad and includes armament racks, external fuel tanks, and inflight refueling equipment.
- Engines and engine parts, including propulsion overhaul, are 336412.
- Complete airframes and full rebuilds to original spec are 336411.
- Avionics sold as instruments and systems are 334511.
Competing in this code
This is where a small aerospace manufacturer actually gets a first federal award. 4,008 IDVs support the code, and DLA long-term contracts plus sustainment buys generate a continuous stream of solicitations sized for shops with 50 employees. Two things gate you: source approval on the specific part number, and Aviation Critical Safety Item handling, which carries qualification requirements that take longer than the contract cycle. Start the source approval request before the solicitation you want appears, not after.
NAICS 336413 FAQ
What is the SBA size standard for NAICS 336413?
SBA sets it at 1,250 employees, counted as a 24-month average headcount across your company and every affiliate, not revenue. At or under that number you are small on NAICS 336413 solicitations and eligible for the set-asides in this code.
Which agencies buy aircraft parts under NAICS 336413?
FY2025 obligations: DoD ($19.6 billion), DHS ($191 million), GSA ($34 million), NASA ($11 million), DOT ($5 million). DoD is 99 percent, and most of that volume runs through DLA Aviation rather than the acquisition program offices.
Why does NAICS 336413 have so many contract awards?
Because it is the sustainment code for aircraft spares. 81,665 awards carried $19.8 billion in FY2025, an average under $250,000 per award. DLA buys parts continuously against long-term contracts and spot requirements, which produces far more, and far smaller, awards than the platform codes above it.
What qualification do I need to sell parts under NAICS 336413?
Source approval on the specific part number, held by the engineering support activity for that platform. Parts designated Aviation Critical Safety Items carry additional qualification and traceability requirements. Neither can be obtained inside a normal solicitation response window, so approval has to be pursued ahead of the buy you are targeting.