What does a flashing red light signal from the control tower indicate while on final approach?

A flashing red light signal from the control tower indicates that the airport is unsafe for landing. This signal is an urgent warning to the pilot to not attempt to land at that time. It is essential for ensuring the safety of the aircraft, crew, and passengers, as it could be due to various reasons such as poor weather conditions, wildlife on the runway, or runway maintenance.

In contrast, other signals have different meanings, such as a steady green light indicating a clear landing, or a steady red light that indicates to the pilot to give way to other aircraft. Recognizing and responding appropriately to these signals is crucial for maintaining safety in the airspace and at the airport.