PSC K029

Overview

The Product Service Code (PSC) system is the federal standard for classifying goods and services in procurement records. PSCs are used in systems such as FPDS and SAM to label the principal product or service being acquired and to support spend reporting, category management, and contract-data analysis. The PSC list and manual are published and maintained on Acquisition.gov by OMB/GSA and serve as the authoritative source for valid PSC values used in federal reporting and system validation.¹

The PSC entry PSC K029 is listed in the PSC Manual as "Modification of Equipment- Engine Accessories." The manual provides the official code title but does not include an extended definition or itemized examples for K029; accordingly, the code title is the formal descriptor used when reporting modifications to engine accessory items in federal procurement records.¹

See also on G2X:

• G2X — PSC K029 overview
• G2X — PSC K028 (engines, turbines, components)
• G2X — PSC N029 (installation — engine accessories)

What this PSC covers

• Modification of engine accessory assemblies. Not specified by official sources.¹
• Alteration or retrofitting of accessory components. Not specified by official sources.¹
• Engineering changes to accessory interfaces and mounts. Not specified by official sources.¹
• Rework or conversion of accessory subsystems for compatibility. Not specified by official sources.¹
• Upgrades to accessory performance or durability. Not specified by official sources.¹

Related NAICS and PSC codes

• Official PSC-to-NAICS crosswalk entries for PSC K029 are not published as a single mandated mapping in the public PSC Manual worksheet on Acquisition.gov; agency FPDS records and the PSC spreadsheet are the authoritative sources for mappings used in reporting. Not specified by official sources.¹

Classification and reporting notes

• PSC selection rule: agencies must report the single Product or Service Code that best identifies the product or service procured; when multiple PSCs could apply, the code representing the largest share of contract value is reported in FPDS.²
• Data element behavior: FPDS treats the Product/Service Code as a mandatory 4-character element; the PSC Manual provides the authoritative list of valid codes for reporting and system validation in FPDS-NG.³

Frequently asked questions

• Q: What specifically does PSC K029 label on a contract?
  A: PSC K029 labels contract line items as "Modification of Equipment- Engine Accessories" per the PSC Manual title. The manual does not provide a list of specific accessories or a detailed definition beyond the code title.¹

• Q: How must agencies use PSC K029 in FPDS reporting?
  A: Agencies must select the PSC that best identifies the product or service being procured. When the primary work is modification of engine accessory items, PSC K029 is the appropriate code to report in the Product/Service Code field; FPDS validations require a valid PSC from the PSC Manual.²

• Q: Is there an official NAICS mapping for PSC K029?
  A: The PSC Manual does not publish a single mandated NAICS mapping for PSC K029; official crosswalks and principal NAICS are determined by reporting agencies and the FPDS contract record. Not specified by official sources.¹

• Q: Where are authoritative PSC definitions and the current code list found?
  A: The PSC Manual (current edition) and the downloadable PSC spreadsheet on Acquisition.gov are the controlling sources for PSC names, additions, and retirements; FPDS documentation explains how PSCs are collected and enforced in contract records.^{1 2}

Useful resources

• G2X — PSC K029 overview
• PSC Manual (current PSC list and manual).¹
• FPDS product/service code guidance (FPDS glossary and element definitions).²
• FPDS-NG data dictionary / Product or Service Code element specification.³

References

1. Acquisition.gov — PSC Manual (PSC Manual April 2025 PDF). https://www.acquisition.gov/content/psc-manual-april-2025.pdf
2. FPDS — Glossary / Product or Service Code (FPDS help). https://www.fpds.gov/help_V1_0/Glossary.htm
3. FPDS — FPDS-NG Data Dictionary / Product or Service Code element specification. https://www.fpds.gov/FPDS-Schema/schemaDocs/DataCollection/contracts/1.5/Contract.html