48 CFR §1232.770-7

1. (a)The contracting officer shall insert the clause at 1252.232-71, Limitation of Government's Obligation, in—
   1. (1)Solicitations and contracts for severable services when incremental funding of a fixed-price, time-and-material, or labor-hour contract due to a CR is anticipated; or
   2. (2)Contracts or orders for severable services when incremental funding of a fixed-price, time-and-material, or labor-hour contract is authorized and DOT or its operating administrations are operating under a CR (see 1232.770-4).
2. (b)The contracting officer shall insert the information required in paragraphs (a) and (c) of clause 1252.232-71. Contracting officers are authorized, in appropriate cases, to revise paragraph (a) of clause 1252.232-71 to specify the work required under the contract, in lieu of using contract line item numbers, as well as revise paragraph (c) of the clause to specify a different notification period and percentage. The 30-day period may be varied up to 90 days, and the 75 percent can be varied from 75 up to 85 percent.