Required Cookies amp Technologies. Some of the technologies we use are necessary for critical functions like security and site integrity, account authentication, security and privacy preferences, internal site usage and maintenance data, and to make the site work correctly for browsing and transactions. Horizontal Lifeline Safety Inspection. Most of the time, when equipment fails, it is due to lack of proper maintenance or inspection. Horizontal lifeline systems must be tagged out and inspected immediately after a fall but as with any equipment, horizontal lifelines also require routine inspections and maintenance.