This is a sole-source procurement for a flight-critical part requiring existing Government source approval prior to award. The Government intends to negotiate with only one pre-approved source, but will consider capability statements from other potential sources. Proposals from non-approved sources must include detailed source approval information as outlined in specific NAVSUP WSS brochures. The Government will consider proposals received within 45 days of the synopsis publication for the purpose of determining future competition. The part requires unique design and manufacturing capabilities held by the approved source.