FAR 52.232-11
Extras.
As prescribed in 32.111 (c)(2) , insert the following clause, appropriately modified with respect to payment due dates in accordance with agency regulations, in solicitations and contracts when a fixed-price supply contract, fixed-price service contract, or transportation contract is contemplated: Extras (Apr 1984) Except as otherwise provided in this contract, no payment for extras shall be made unless such extras and the price therefor have been authorized in writing by the Contracting Officer. (End of clause)
Source: acquisition.gov — FAR
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