This procurement is for three units of a flight-critical part that requires existing Government source approval prior to contract award, and only pre-approved sources have been solicited. The acquisition is partially set aside for small business concerns. Interested parties who are not approved sources must submit specific source approval information with their proposal, as detailed in the provided NAVSUP WSS brochures. The Government is not using commercial item acquisition policies for this requirement, but parties may identify their capability to provide a commercial equivalent within 15 days of this notice. Delivery is FOB Origin.