45 CFR 1630.6 - Timetable and basis for granting prior approval.
(a) The Corporation shall grant prior approval of a cost if the recipient has provided sufficient written information to demonstrate that the cost would be consistent with the standards and policies of this part. If the Corporation denies a request for approval, it shall provide to the recipient a written explanation of the grounds for denying the request.
(b) Except as provided in paragraphs (c) and (d) of this section, the Corporation may not assert the absence of prior approval as a basis for disallowing a questioned cost, if the Corporation has not responded to a written request for approval within sixty (60) days of receiving the request.
(c) If additional information is necessary to enable the Corporation to respond to a request for prior approval, the Corporation may make a written request for additional information within forty-five (45) days of receiving the request for approval.
(d) If the Corporation has made a written request for additional information about a cost as provided by paragraph (c) of this section, and if the Corporation has not responded within thirty (30) days of receiving in writing all additional, requested information, the Corporation may not assert the absence of prior approval as a basis for disallowing the cost.