In aircraft maintenance, what does a "red tag" indicate?

A "red tag" in aircraft maintenance signifies that a component is out of service due to maintenance or replacement needs. This denotes a clear status that a part or system is not in a condition suitable for operation, ensuring that maintenance personnel and flight crews are aware of the component's unserviceable status. The use of a red tag helps maintain safety and compliance with operational standards, preventing any inadvertent use of faulty equipment that could jeopardize flight safety.

The significance of the red tag lies in its role as a visual warning and an important part of the maintenance documentation process. It indicates that further inspection or repairs are necessary before the aircraft can return to service, thus playing a critical role in maintaining operational integrity and safety.

Other possible interpretations, such as indicating readiness for service, scheduling for a test flight, or signaling that repairs have been completed, do not align with the established color-coding and tagging system used in aviation maintenance practices. The red tag specifically alerts personnel to a need for maintenance intervention.