48 CFR § 6.001 - Applicability.
This part applies to all acquisitions except -
(b) Contracts awarded using contracting procedures (other than those addressed in this part) that are expressly authorized by statute;
(c) Contract modifications, that are within the scope of the contract, including the exercise of priced options that were evaluated as part of the original competition (see 17.207(f));
(d) Orders placed under requirements contracts or definite-quantity contracts;
(e) Orders placed under indefinite-quantity contracts that were entered into pursuant to this part when -
(1) The contract was awarded under subpart 6.1 or 6.2 and all responsible sources were realistically permitted to compete for the requirements contained in the order; or
(2) The contract was awarded under subpart 6.3 and the required justification and approval adequately covers the requirements contained in the order; or
(f) Orders placed against task order and delivery order contracts entered into pursuant to subpart 16.5.