48 CFR § 4.705-3 - Acquisition and supply records.
(a) Store requisitions for materials, supplies, equipment, and services: Retain 2 years.
(b) Work orders for maintenance and other services: Retain 4 years.
(c) Equipment records, consisting of equipment usage and status reports and equipment repair orders: Retain 4 years.
(d) Expendable property records, reflecting accountability for the receipt and use of material in the performance of a contract: Retain 4 years.
(e) Receiving and inspection report records, consisting of reports reflecting receipt and inspection of supplies, equipment, and materials: Retain 4 years.
(f) Purchase order files for supplies, equipment, material, or services used in the performance of a contract; supporting documentation and backup files including, but not limited to, invoices, and memoranda; e.g., memoranda of negotiations showing the principal elements of subcontract price negotiations (see 52.244–2): Retain 4 years.
(g) Production records of quality control, reliability, and inspection: Retain 4 years.
(h) Property records (see FAR 45.101 and 52.245–1): Retain 4 years.