This is a procurement for a flight-critical part requiring Government source approval prior to contract award, with only previously approved sources being solicited. The Government intends to negotiate with only one source under FAR 6.302-1, but all responsible sources may submit proposals or capability statements. Proposals received within 45 days of the synopsis publication will be considered by the Government. Interested parties may also identify their capability to satisfy the requirement with a commercial item within 15 days of this notice. The time required for approval of a new source is normally too long to delay an award.