PSC AS24

Overview

The Product and Service Code (PSC) system classifies what the U.S. government buys in contract reporting (e.g., FPDS data surfaced in SAM.gov). PSCs enable consistent tracking, analysis, and reporting, and are governed by GSA’s PSC Manual. ²

PSC AS24 designates Transportation R&D Services for Aerospace Research at the “R&D Administrative Expenses” stage. The PSC Manual defines the “4” stage as administrative expenses for R&D—such as operating costs of research facilities and equipment and other overhead—applied here to aerospace research programs. ¹

See also on G2X:

• G2X — PSC AS21
• G2X — PSC AS25

What this PSC covers

• Operating costs of aerospace research laboratories, test ranges, and other facilities supporting R&D missions. ¹
• Operation and maintenance costs for R&D equipment used in aerospace research activities. ¹
• Program administration, management, and other indirect/overhead expenses charged to aerospace R&D portfolios. ¹
• Administrative support services (e.g., finance, HR, logistics) when recorded as aerospace R&D overhead rather than direct research work. ¹
• Expenses necessary to run aerospace R&D programs that are not the performance of basic/applied research or experimental development themselves. ¹
• Excludes purchases of products in support of R&D; such items must be coded with the appropriate product PSC, not an R&D PSC. ¹

Related NAICS and PSC codes

Coding notes and boundaries

• The R&D PSC structure uses two letters plus two digits; the fourth digit indicates stage: 1 basic research, 2 applied research, 3 experimental development, 4 administrative expenses, 5 facilities/major equipment. ¹
• Do not assign an R&D PSC to products purchased in support of R&D; select the applicable product PSC instead. ¹
• Topic drives the “major area.” For example, environmental impacts (e.g., pollution control) are coded under Natural Resources & Environment rather than Aerospace Research. ¹

Frequently asked questions

• What exactly is PSC AS24?

  PSC AS24 is “Transportation R&D Services; Aerospace Research; R&D Administrative Expenses.” It captures the administrative/overhead costs for aerospace R&D programs rather than the execution of research or development tasks. ¹

• Which kinds of costs belong in AS24?

  Administrative expenses for R&D include operating costs of research facilities and equipment and other overhead costs; when those expenses support aerospace research, they fall under AS24. ¹

• How does AS24 differ from AS25?

  AS24 covers administrative/overhead expenses, while AS25 covers expenses for R&D facilities and major equipment (e.g., purchase or construction of R&D facilities or major movable instruments). ¹

• When should AS24 not be used?

  Do not use an R&D PSC for products or non-R&D items purchased in support of research; these are coded with product PSCs. Likewise, environmental topics belong under their own domains rather than Aerospace Research. ¹

• Is there an official NAICS crosswalk for AS24?

  Not specified by official sources ².

Useful resources

• G2X — PSC AS24
• Acquisition.gov — Product and Service Code (PSC) Manual, April 2025 (PDF). ¹
• Acquisition.gov — PSC Manual landing page. ²
• SAM.gov — Contract Award Data (FPDS authoritative source during migration). ³

References

1. Acquisition.gov. Product and Service Code (PSC) Manual, April 2025 (PDF). https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
2. Acquisition.gov. Product and Service Code Manual landing page. https://www.acquisition.gov/psc-manual
3. SAM.gov. Contract Award Data. https://sam.gov/contract-data