Section 914.502 - Conditions for use(c) Use of the two-step sealed bidding method shall be approved by the Head of the Contracting Activity. The contracting officer shall submit a written request for approval justifying its use in accordance with 48 CFR 14.502 .50 FR 12184, Mar. 27, 1985, as amended at 76 FR 7692, Feb. 11, 2011