If the centerline is yellow, what should you do next?

When the centerline is yellow, it indicates that the aircraft is on a taxiway not intended for typical aircraft movement, often an area that could be hazardous or with limited access. In such situations, the appropriate response is to stop and request progressive taxi instructions from Air Traffic Control (ATC). This action ensures that the pilot receives specific guidance to navigate safely back to a designated area, minimizing the risk of taxiing into an unsafe position or onto an active runway.

Requesting progressive taxi instructions allows ATC to provide the necessary adjustments to the aircraft's route, ensuring safety and compliance with all operational procedures. Continuing to taxi without clarification could lead to potential hazards, while notifying the captain may not adequately address the immediate need for direction. Stopping the aircraft without contacting ATC could lead to unnecessary delays and does not utilize available resources for safe navigation. Thus, seeking progressive taxi instructions directly addresses the situation prompted by the yellow centerline.