This solicitation is for 27 units of NSN 7R-6150-015773456-H1, with delivery FOB origin. The item is flight critical and requires Government source approval before award; only previously approved sources have been solicited. New sources must submit the required source approval information per the NAVSUP WSS brochures, and offers lacking complete data will not be considered. The approval process for new sources normally cannot be completed in time to delay award. The Government is not using commercial item acquisition procedures, but interested parties may express capability to supply a commercial item within 15 days of this notice.