Presolicitation notice from the Department of Defense, Department of the Navy, for the repair/modification of a high valve assembly. This assembly, categorized under miscellaneous aircraft accessories and components, is used in aircraft maintenance and repair. The notice specifies that the item requires government source approval due to its criticality in flight operations and the lack of adequate technical data for competitive acquisition. Interested parties must submit the necessary information for source approval along with their proposals. The notice also provides links to the NAVSUP Weapon Systems Support source approval information brochures. The proposed contract action is intended for a single source, but all responsible sources can express their interest and capability to respond to the requirement within the specified timeframe. The government is not using the policies contained in FAR Part 12 for this solicitation, but interested parties can identify their capability to provide a commercial item.