What should a pilot do upon receiving an alternating green and red light followed by a flashing red light while on final approach?

Upon receiving an alternating green and red light followed by a flashing red light, the pilot should abandon the approach. This signal indicates that the runway is unsafe for landing. The alternating green and red lights typically indicate that there is a situation on the runway that may pose a danger, while the flashing red light is a clear directive that the pilot must not land at that time.

It is essential for pilots to strictly adhere to these signals to ensure safety. The flashing red signal emphasizes the urgency of abandoning the approach and moving to another safe option, such as diverting to another airport or circling for another approach elsewhere. Prioritizing safety and compliance with traffic control guidance is crucial in these scenarios.