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48 CFR · Federal Acquisition Regulation and Defense supplement

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The codified text (eCFR, as of 2026-10-02). Under the Revolutionary FAR Overhaul ↗, agencies follow class deviations with new text for many parts while the formal rules go through the Federal Register: check the solicitation and your contract's clauses, which rule.

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32 sections with “major modification”

  • FAR 2.101 Definitions.
    … (see 9.505-1(b)) to ensure the effective operation and maintenance of a weapon system or major system as defined in OMB Circular No. A-109 or to provide direct support of a weapon system that is essential to research, development, producti…
  • FAR 27.409 Solicitation provisions and contract clauses
    …the clause at 52.227-21, Technical Data Declaration, Revision, and Withholding of Payment—Major Systems, in contracts for major systems acquisitions or for support of major systems acquisitions. This requirement includes contracts for detai…
  • DFARS 234.7002 Policy.
    (a) Major weapon systems. (1) A DoD major weapon system may be treated as a commercial product, or acquired under procedures established for the acquisition of commercial products, only if— (i) The Secretary of Defense determines that— (A…
  • DFARS 252.215-7010 Requirements for Certified Cost or Pricing Data and Data Other Than Certified Cost or Pricing Data.
    … determination, and if available, a Government point of contact; (B) For subsystems of a major weapon system and components and spare parts of a major weapon system or subsystem of a major weapon system that have not previously been determ…
  • FAR 22.1003-6 Repair distinguished from remanufacturing of equipment.
    …turing when the criteria in either paragraphs (a)(1) or (2) of this section are met. (1) Major overhaul of an item, piece of equipment, or materiel which is degraded or inoperable, and under which all of the following conditions exist: (i…
  • FAR 46.407 Nonconforming supplies or services.
    …fficer ordinarily must reject supplies or services when the nonconformance is critical or major or the supplies or services are otherwise incomplete. However, there may be circumstances (e.g., reasons of economy or urgency) when the contrac…
  • FAR 52.234-2 Notice of Earned Value Management System—Preaward Integrated Baseline Review.
    …VM system will be compliant with the EIA-748 guidelines. (c) Offerors shall identify the major subcontractors, or major subcontracted effort if major subcontractors have not been selected subject to the guidelines. The prime Contractor and…
  • FAR 52.234-3 Notice of Earned Value Management System—Postaward Integrated Baseline Review.
    …VM system will be compliant with the EIA-748 guidelines. (c) Offerors shall identify the major subcontractors, or major subcontracted effort if major subcontractors have not been selected, planned for application of the guidelines. The pri…
  • FAR 52.234-4 Earned Value Management System.
    …cer may require an IBR at— (1) Exercise of significant options; or (2) Incorporation of major modifications. (e) Unless a waiver is granted by the CFA, Contractor proposed EVMS changes require approval of the CFA prior to implementation.…
  • DFARS 202.101 Definitions.
    …ice of the Secretary of Defense. (For emergency acquisition flexibilities, see 218.270.) Major defense acquisition program is defined in 10 U.S.C. 4201. Material weakness means a deficiency or combination of deficiencies in the internal c…
  • DFARS 215.403-1 Prohibition on obtaining certified cost or pricing data (10 U.S.C. chapter 271 and 41 U.S.C. chapter 35).
    …ducts or commercial services, except see 234.7002(e) for pricing commercial subsystems of major weapon systems and components and spare parts of major weapon systems and of subsystems of major weapon systems. (B) When applying the commerci…
  • DFARS 236.570 Additional provisions and clauses.
    …er— (i) 252.236-7003, Payment for Mobilization and Preparatory Work. Use this clause for major construction contracts that require— (A) Major or special items of plant and equipment; or (B) Large stockpiles of material which are in exces…
  • DFARS 252.234-7002 Earned Value Management System.
    …t award; (2) The exercise of significant contract options; and (3) The incorporation of major modifications. During such reviews, the Government and the Contractor will jointly assess the Contractor's baseline to be used for performance …
  • DFARS 208.7003-2 Assignments under coordinated acquisition.
    …e only from the original source for follow-on contract); (j) Items directly related to a major system and which are design controlled by and acquired from either the system manufacturer or a manufacturer of a major subsystem; (k) Items su…
  • DFARS 252.211-7003 Item Unique Identification and Valuation.
    …e designation means a combination of letters and numerals assigned by the Government to a major end item, assembly or subassembly, as appropriate, to provide a convenient means of differentiating between items having the same basic name and…
  • DFARS 252.225-7009 Restriction on Acquisition of Certain Articles Containing Specialty Metals.
    …e item of this contract. High performance magnet means a permanent magnet that obtains a majority of its magnetic properties from rare earth metals (such as samarium). Produce means— (i) Atomization; (ii) Sputtering; or (iii) Final con…
  • FAR 31.105 Construction and architect-engineer contracts.
    …equipment, that are not included in the rental rate are allowable. (B) Costs incident to major repair and overhaul of rental equipment are unallowable. (C) The allowability of charges for construction equipment rented from any division, s…
  • FAR 45.101 Definitions.
    …ractor's operation at any one plant or separate location; or (3) A separate and complete major industrial operation. Demilitarization means rendering a product unusable for, and not restorable to, the purpose for which it was designed or …
  • FAR 49.109-7 Settlement by determination.
    …dditional information, schedules, and analyses as appropriate. The TCO shall explain each major item of disallowance. The TCO need not reconsider any other action relating to the terminated portion of the contract that was ratified or appro…
  • FAR 52.216-7 Allowable Cost and Payment.
    …(G) Reconciliation of books of account (i.e., General Ledger) and claimed direct costs by major cost element. (H) Schedule of direct costs by contract and subcontract and indirect expense applied at claimed rates, as well as a subsidiary s…
  • FAR 52.245-1 Government Property.
    …ractor's operation at any one plant or separate location; or (3) A separate and complete major industrial operation. Demilitarization means rendering a product unusable for, and not restorable to, the purpose for which it was designed or …
  • DFARS 201.170 Peer reviews.
    …GI 201.170-2(a)) for all procurements with an estimated value of $1 billion or more under major defense acquisition programs for which the Under Secretary of Defense for Acquisition and Sustainment (USD(A&S)) is the milestone decision autho…
  • DFARS 215.403-3 Requiring data other than certified cost or pricing data.
    …Commercial products or commercial services. For determinations of price reasonableness of major weapon systems acquired as commercial products, see 234.7002(e).
  • DFARS 215.408 Solicitation provisions and contract clauses.
    …ld-Cost Review, in all solicitations and contracts for the development or production of a major weapon system, as defined in 234.7001.
  • DFARS 225.772-1 Definitions.
    …trust, corporation or division of a corporation, or organization that demonstrates that a majority of the equity interest in such entity is ultimately owned by U.S. nationals is not a foreign entity. (31 CFR 800.212) Government of a covere…
  • DFARS 228.370-1 Definitions.
    …ractor's operation at any one plant or separate location; or (3) A separate and complete major industrial operation. Covered aircraft means an aircraft owned by or to be delivered to the Government and, when determined by the contracting …
  • DFARS 237.7204 Format and clauses for educational service agreements.
    …iculum” means a series of courses having a unified purpose and belonging primarily to one major academic field. It will usually include certain required courses and elective courses within established criteria. Examples include Business Adm…
  • DFARS 242.302 Contract administration functions.
    … contract administration functions related to IR&D projects and B&P projects performed by major contractors, see 242.771-3(a). (12) Also perform all payment administration in accordance with any applicable payment clauses. (13)(A) Do not …
  • DFARS 243.107-70 Notification of substantial impact on employment.
    … Secretary of Defense is required to notify the Secretary of Labor if a modification of a major defense contract or subcontract will have a substantial impact on employment. The clause prescribed at 249.7003(c) requires that the contractor …
  • DFARS 252.219-7004 Small Business Subcontracting Plan (Test Program).
    …th separately by— (A) North American Industrial Classification System (NAICS) code; (B) Major defense acquisition program, as defined in 10 U.S.C. 4201; (C) Contract number, if the contract is for maintenance, overhaul, repair, servicing…
  • DFARS 252.225-7052 Restriction on the Acquisition of Certain Magnets, Tantalum, and Tungsten.
    … this contract. Subsystem means a functional grouping of items that combine to perform a major function within an end item, such as electrical power, attitude control, and propulsion. Tungsten heavy alloy means a tungsten base pseudo allo…
  • DFARS 252.228-7001 Ground and Flight Risk.
    …ractor's operation at any one plant or separate location; or (3) A separate and complete major industrial operation. Contractor's premises means those premises, including subcontractors' premises, designated in the Schedule or in writing …

FAR (chapter 1)

DFARS (chapter 2, Defense)

Source: eCFR, 48 CFR chapters 1 and 2 (GPO GovInfo bulk data) ↗. Rule changes in progress: FAR, DFARS. Terms: glossary.