48 CFR § 1813.003
Policy. (NASA supplements paragraph (g))
November 17, 2020
(g) Acquisitions under these simplified acquisition procedures shall be fixed-price, except as provided under the unpriced purchase order method in FAR 13.302-2.
[63 FR 40189, July 28, 1998, as amended at 64 FR 5620, Feb. 4, 1999]