What are the advantages of using a 'Self-Locking' spiral retaining ring in high-vibration aerospace environments?

In high-vibration or high-RPM applications, standard rings can 'vibrate' out of the groove if the centrifugal or inertial forces momentarily exceed the cling force. A 'Self-Locking' spiral ring features a small 'tab' on an inner turn that locks into a 'slot' on an outer turn. This mechanical interlock prevents the ring from expanding radially. Once installed, the ring cannot be removed without a tool to disengage the tab. This provides a 'fail-safe' mechanism for critical components like turbine main-shaft bearings, where a ring failure would result in catastrophic engine loss.