Which rule states that all safety wires must be tight after installation but not overly tensioned?

The rule regarding safety wiring is critical for ensuring the integrity and reliability of fasteners in aviation applications. The concept that all safety wires must be tight after installation but not overly tensioned is rooted in the need for securing fasteners against unintended loosening while also allowing for slight movement during dynamic operation. Overly tensioned wires can lead to fatigue or failure, while loose wires may not provide adequate security.

This principle is outlined in the established protocols for safety wiring, which dictate that the safety wire must be secure enough to withstand vibrations and other forces. However, excessive tension can cause damage to both the wire and the component it is securing, as well as potentially affect the operational capability of the aircraft.

The other options refer to broader categories that may involve safety practices or installation procedures but do not specifically highlight the nuance of wire tension after installation as the focus of safety wiring rules does. This reinforces the importance of understanding this particular guideline to maintain aircraft safety and operational integrity.