An method for the rapid manufacturing of aerospace replacement parts 100 is provided, including removing an in-service aerospace part from an aerospace system 120. The board is positioned on top of wheels, half wheels or some other supporting structure, allowing an individual standing on the board to move the board around to work the maze. Methods of correlating and combining Mode A, Mode C, and Mode S messages to enhance target tracking in a passive surveillance system are provided. A data processor of the monitor may then be employed to analyze acoustic data and timing information to distinguish acceptable noise from leak information.