When is a new strip generated in air traffic control?

A new strip is generated in air traffic control primarily after each fix the aircraft crosses. This is because the strip serves as an updated record of the aircraft's current situation and trajectory, reflecting important changes in its flight path, such as waypoints or fixes. Each fix represents a pivotal point in the flight plan, and generating a new strip upon crossing these fixes ensures that the controllers have the most current information on the aircraft’s position, intended route, and other pertinent details that inform their decision-making process.

This system enhances situational awareness and helps maintain safety and efficiency in operations, as controllers can track the aircraft's progression and comply with any necessary adjustments or communications.