Presolicitation notice from the Department of Defense, Department of the Navy, and NAVSUP Weapon Systems Support is seeking to procure a detector for ice. This item, with National Stock Number (NSN) 7R-6340-012122907-VH, is used for aircraft alarm and signal systems. The government requires source approval prior to contract award due to the item's flight critical nature and inadequate technical data. Only previously approved sources have been solicited. Interested parties must submit the necessary information for source approval. The proposed contract action is for supplies or services for which the government intends to negotiate with only one source. All responsible sources may express their interest and capability to respond. The solicitation includes information on qualification requirements and applicable trade agreements. The item must be acquired from/repaired by a specified source as defined by DoD-STD-100, as suitable technical data or manufacturing/repair knowledge is not available from other sources.