The recommendations in booklet 31

The recommendations in booklet 31 deals with the mission time of safety-related electrical, electronic, and programmable electronic equipment of ropeways and addresses ropeway operators, manufacturers, inspection bodies, national authorities responsible for ropeways and notified bodies. In the course of time, the relevant standards for safety-related systems, (e.g. EN ISO 13849-1, EN IEC 62061 or EN 61131-6) have changed fundamentally. An important part of these changes is that a mission time of up to 20 years has been introduced.

Because the typical service life of the cable car is longer than the service life of the control system, measures are required to ensure the safety of the affected parts of the ropeway control system. Booklet 31 sets out strategies for possibly dealing with an extension of the mission time and suggests possible measures.