Under what condition should a harness be immediately removed from service?

A harness is a critical piece of safety equipment designed to protect individuals when working at heights. It plays a vital role in preventing injuries during falls. Each of the conditions mentioned indicates a serious compromise to the integrity and safety of the harness.

When visible wear is present, it can indicate that the materials are degrading and may not provide the necessary support in the event of a fall. Damaged hardware, such as buckles or D-rings, can fail under stress, risking the user's safety. If a harness has been involved in a fall, even if there is no visible damage, internal stresses may have compromised its structural integrity, making it unsafe for continued use.

Thus, any one of these conditions necessitates the immediate removal of the harness from service to ensure the wearer’s safety. The correct response is that all of these conditions warrant taking the harness out of service.