This is a specialized procurement for 29 units of a flight-critical part that requires existing Government source approval prior to contract award. The Government intends to negotiate with only one pre-approved source but will consider capability statements from other responsible sources within 45 days of the notice's publication. Interested parties who are not already approved sources must submit specific source approval information with their proposal, as detailed in the provided NAVSUP WSS brochures. The Government will not delay an award to wait for a new source to gain approval.