What might a red gear indicator light signify?

A red gear indicator light typically signifies a malfunction in the landing gear system. This warning light alerts the pilot to potential issues, such as a gear not being fully extended or retracted, problems with the landing gear actuators, or other system inconsistencies that require immediate attention. Because this light is red, it indicates a critical situation that could affect the safety of landing or takeoff.

In contrast, a fully deployed or correctly positioned landing gear would normally be indicated by green lights, not red. Likewise, the status of landing gear doors being closed would also be indicated by a signal that suggests normal operation rather than a malfunction. Thus, the presence of a red light serves as a vital warning that requires verification and possibly immediate troubleshooting.