During contract performance, contractor requests for overtime exceeding the amount authorized in paragraph (a) of the clause at FAR 52.222-2, Payment for Overtime Premiums, must be approved at a level above the contracting officer. Such approval should be reflected by the signature of the approving official on the contracting officer's written determination made in accordance with FAR 22.103-4.
48 C.F.R. §§2822.103-4