Division 3.2.2 Reliability and Availability

For Class A system, the global reliability and availability objectives for the Subsystem are apportioned between the On-board and Track-side Assemblies. The detailed requirements are specified in the Basic Parameter defined in section 4.2.1 (Control-Command safety characteristics relevant to interoperability).

The quality of the maintenance organisation for all systems comprising the Control-Command Subsystem shall ensure that the level of risk is controlled as constituents age and wear. The quality of the maintenance shall ensure that safety is not prejudiced because of these activities. See section 4.5 (Maintenance rules).