The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of pressure altimeters, identified by NSN 7R-6610-017108368-QF. The procurement involves a quantity of six units, which are critical for flight operations, and requires government source approval prior to contract award due to the technical data limitations for open competition. Interested vendors must provide necessary documentation for source approval along with their proposals, as offers lacking this information will not be considered. For further inquiries, interested parties can contact Jacob A. Tarlini at (215) 697-3563 or via email at JACOB.TARLINI@NAVY.MIL, with proposals due within 45 days of the notice publication.