PSC 1660

Overview

The Product Service Code system classifies what the U.S. government buys so obligations can be tracked and analyzed across FPDS and related acquisition systems. Codes are governed through the PSC Manual and selected based on the predominant item or service in each contract action. This standardization enables consistent reporting and category management across agencies. ¹

PSC 1660 covers aircraft‑specific environmental control components. Per the PSC Manual, it includes items designed for aircraft air conditioning, heating, and cabin pressurization, as well as specially designed components of onboard oxygen breathing systems. The class lists examples such as cabin supercharging equipment, pressure regulators, heat exchangers, air expansion turbines, heaters, duct assemblies, and thermal de‑icing equipment. ¹

What this PSC covers

• Cabin supercharging and pressurizing equipment used to maintain aircraft cabin altitude and comfort. ¹
• Specially designed aircraft oxygen system components, including canisters, cylinder assemblies, masks, fixed oxygen systems, and liquid oxygen converters. ¹
• Cabin pressure control devices such as regulators and selectors. ¹
• Environmental control heat transfer hardware, including heat exchangers and air expansion turbines (air‑cycle machine components). ¹
• Aircraft heaters and ventilating system components tailored for aviation applications. ¹
• Air conditioning and heating duct assemblies and air diffusers installed in aircraft. ¹
• Thermal de‑icing equipment that is part of the aircraft environmental/anti‑ice suite. ¹

Related NAICS and PSC codes

Inclusions and exclusions highlights

• Includes components specifically designed for aircraft air conditioning, heating, and pressurizing equipment; also includes specially designed components of aircraft oxygen breathing systems. ¹
• Excludes oxygen pressure signals and warning devices; general tubing; and ground‑type heaters and coolers (not aircraft‑installed). ¹
• Excludes valves designed for use with aircraft engines (2840) or guided missiles; includes specially designed aircraft valves for environmental/pressurization use. ¹
• For hydraulics, vacuum, and fluid de‑icing components, see 1650; for miscellaneous aircraft accessories (e.g., ventilators, inert gas generators), see 1680. ¹
• Non‑aircraft complete A/C units belong under 4120; general refrigeration/A‑C operating components are typically under 4130. ¹

Coding guidance for FPDS/SAM

• PSCs record “what” was bought in FPDS; select the PSC based on the predominant item on the action (FPDS data element 8A). Apply PSC 1660 when the primary deliverables are aircraft environmental control or cabin pressurization components. ¹
• The PSC Manual provides structure and examples; use it to distinguish closely related aircraft classes such as 1650 and 1680. ¹

Frequently asked questions

• What products fall under PSC 1660?
  Aircraft‑specific environmental control and pressurization components: cabin supercharging and pressure control devices, oxygen system components (canisters, masks, LOX converters), heat exchangers, air expansion turbines, heaters, ventilating parts, duct assemblies, diffusers, and thermal de‑icing equipment uniquely designed for aircraft installation. ¹

• Does PSC 1660 include oxygen equipment?
  Yes. It includes specially designed components of aircraft oxygen breathing systems—such as canisters, cylinder assemblies, masks, fixed oxygen systems, and liquid oxygen converters. Oxygen pressure signals and warning devices are excluded because they are not environmental/pressurization components. ¹

• How do I differentiate PSC 1660 from PSC 1650?
  Use 1660 for air conditioning, heating, pressurization, and related oxygen components. Use 1650 for hydraulic, vacuum, and fluid de‑icing components. Environmental/pressurization valves belong in 1660, not 1650. ¹

• Are complete non‑aircraft A/C units coded in PSC 1660?
  No. Complete air conditioning units and systems intended for general (non‑aircraft) use are coded to 4120. PSC 1660 applies to aircraft‑specific environmental or pressurization components, not facility or vehicular A/C systems. ¹

• Are engine valves or missile‑system valves ever coded under PSC 1660?
  No. Valves designed for aircraft engines belong to 2840, and missile‑system valves are coded to the appropriate missile classes. Only aircraft environmental or cabin pressurization valves are assigned to PSC 1660. ¹

Useful resources

• G2X — PSC 1660: https://app.g2xchange.com/psc/1660
• Acquisition.gov — Product and Service Code (PSC) Manual, April 2025 (current). ¹
• Acquisition.gov — PSC Manual landing page (downloads and governance). ²

References

1. Acquisition.gov, PSC Manual April 2025 (current), “Section D: Product Codes,” entries for 1650–1680; “Introduction” and coding guidance. https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
2. Acquisition.gov, Product and Service Code Manual (landing page with current/archived downloads). https://www.acquisition.gov/psc-manual