scope:

1.1 This European Standard: - defines RAMS in terms ofreliability, availability, maintainability and safety and theirinteraction; - defines a process, based on the system lifecycle andtasks within it, for managing RAMS; - enables conflicts betweenRAMS elements to be controlled and managed effectively; - defines asystematic process for specifying requirements for RAMS anddemonstrating that these requirements are achieved; - addressesrailway specifics; - does not define RAMS targets, quantities,requirements or solutions for specific railway applications; - doesnot specify requirements for ensuring system security; - does notdefine rules or processes pertaining to the certification ofrailway products against the requirements of this standard; - doesnot define an approval process by the safety regulatory authority.1.2. This European Standard is applicable: - to the specificationand demonstration of RAMS for all railway applications and at alllevels of such an application, as appropriate, from completerailway routes to major systems within a railway route, and toindividual and combined sub-systems and components within thesemajor systems, including those containing software; in particular:- to new systems; - to new systems integrated into existing systemsin operation prior to the creation of this standard, although it isnot generally applicable to other aspects of the existing system; -to modifications of existing systems in operation prior to thecreation of this standard, although it is not generally applicableto other aspects of the existing system. - at all relevant phasesof the lifecycle of an application; - for use by RailwayAuthorities and the railway support industry. NOTE: Guidance on theapplicability is given in the requirements of this standard.