This is a sole-source procurement for a flight-critical part requiring existing Government source approval. The Government intends to negotiate with only one pre-approved source, but unapproved sources may submit proposals and capability statements. Unapproved bidders must submit detailed technical data for source approval alongside their proposal, following specific NAVSUP WSS procedures. The Government will consider proposals received within 45 days of the synopsis publication for the purpose of determining future competition. Interested parties may also identify their capability to provide a commercial alternative within 15 days of this notice.