PSC AS21: Transportation R&D Services; Aerospace Research; Basic Research
AS21 is the product and service code (PSC) federal agencies use for “Transportation R&D Services; Aerospace Research; Basic Research”, in the “R&D – Trans – Motor Veh” group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 0
- Federal contract spending, FY2025
- $4.9 million
- Share of contract dollars to small businesses, since FY2024
- 69%
Open count as of Oct 28, 2026, 8:02 PM ET. The search counts live, so its total can differ by a notice or two.
Where AS21 sits in the PSC Manual
- Category: Research and Development
- Group AS: Transportation R&D Services
- Group AS2: R&D – Trans – Motor Veh
- Code AS21: Transportation R&D Services; Aerospace Research; Basic Research
NAICS codes used with PSC AS21
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with AS21 most often:
| NAICS | Industry | Spent, last 3 years | Open with PSC AS21 |
|---|---|---|---|
| 541330 | Engineering Services | $12.9 million | — |
| 541715 | Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) | $4.5 million | — |
| 541910 | Marketing Research and Public Opinion Polling | $3.1 million | — |
| 336412 | Aircraft Engine and Engine Parts Manufacturing | $249,672 | — |
| 561990 | All Other Support Services | $98,701 | — |
| 334220 | Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing | $80,650 | — |
Open contracts under each code, with any PSC: NAICS 541330 · NAICS 541715 · NAICS 541910 · NAICS 336412 · NAICS 561990 · NAICS 334220
Who buys under PSC AS21
Agencies with the most contract dollars under AS21 over the last three fiscal years, per USAspending.gov. Each name links to that agency's open contracts and buying history:
| Agency | Obligated |
|---|---|
| Federal Aviation Administration | $18.3 million |
| National Aeronautics and Space Administration | $2.3 million |
| National Highway Traffic Safety Administration | $240,155 |
| Immediate Office of the Secretary of Transportation | $98,701 |
| Federal Highway Administration | $45,000 |
| National Park Service | $31,509 |
Federal spending under PSC AS21 by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $6.5 million |
| FY2025 | $4.9 million |
| FY2026 (incomplete) | $9.6 million |
Headline figures use FY2025, the last complete year. FY2026 is still incomplete and will rise until about early January 2027 as Defense data arrives: USAspending.gov publishes Defense contracts 90 days after they're signed.
Who wins PSC AS21 contracts
| Company | Obligated, last 3 years |
|---|---|
| Diakon Solutions LLC | $15.7 million |
| Woolpert, Inc. | $2.5 million |
| Dynamic Science, Inc. | $1.6 million |
| Crash Research & Analysis, Inc. | $1.6 million |
| RTX Corporation | $1.2 million |
| Northrop GrummanListed as Northrop Grumman Systems Corporation | $999,973 |
| President and Fellows of Harvard College | $98,701 |
| Freefly Systems Inc | $80,650 |
| Leidos, Inc. | $45,000 |
| Ajce Corporation | $31,509 |
Linked names have a FedReady profile, which shows the NAICS codes a business is registered as small under. Most large companies have none.
Large prime contractors (companies that hold the contract with the agency) subcontract part of their work to small businesses. See which primes subcontract, by NAICS code.
Research PSC AS21 work
By the NAICS codes this work goes with, the one with the most spending first: who won recently, contracts ending soon, agencies' planned buys and the large primes that subcontract it, nationwide. Each code shows only the pages that exist for it:
- 541330 Engineering Services: who won recently · contracts ending in the next 12 months · planned buys · large primes that subcontract
- 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology): who won recently · contracts ending in the next 12 months · planned buys · large primes that subcontract
- 541910 Marketing Research and Public Opinion Polling: who won recently · large primes that subcontract
Related PSC codes
- AS22 Transportation R&D Services; Aerospace Research; Applied Research
- AS23 Transportation R&D Services; Aerospace Research; Experimental Development
- AS24 Transportation R&D Services; Aerospace Research; R&D Administrative Expenses
- AS25 Transportation R&D Services; Aerospace Research; Expenses for R&D Facilities and Major Equipment
- AS26 R&D – Modal Transportation: Surface Motor Vehicles (Management/Support)
- AS27 R&D – Modal Transportation: Surface Motor Vehicles (Commercialized)
Frequently asked questions
What is PSC AS21?
AS21 is the research and development code in the federal Product and Service Code (PSC) Manual named “Transportation R&D Services; Aerospace Research; Basic Research”, under AS (Transportation R&D Services) and AS2 (R&D – Trans – Motor Veh). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC AS21?
Most federal contract dollars under PSC AS21 go with NAICS 541330 (Engineering Services), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC AS21?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. FedReady can match new ones to your business and email you, free.
Keep going
Sources: SAM.gov Contract Opportunities, USAspending.gov and the PSC Manual. How we count.