ERTMS/ETCS RAMS Requirements Specification Chapter 2 - RAM

EEIG ERTMS Users GroupChangeability:The activities of modification and of defect removalshall be facilitated, and the effort needed for adaptingsoftware to environment changing (i.e., operatingsystem, hardware architecture, etc.) shall be minimised.Stability:The risk that undesirable effects may occur as aconsequence of a modification shall be minimised.Testability:Software testing and validation activities consequent toa modification shall be facilitated as much as possible.2.2.2.3.2 Preventive MaintenanceFor Preventive Maintenance, at system level, qualitative requirements only aredefined.® Each Contractor/Sub-contractor/Supplier responsible for the provision ofERTMS/ETCS equipment or parts, shall declare, providing appropriatedocumentation, the Preventive Maintenance Requirements necessary forensuring the required RAM Performance, as defined in this specification, forthe equipment under its competency.® The Preventive Maintenance Requirements, defined by each Contractor/Subcontractor/Suppliershall comply with the Logistic Support Requirementsdefined in this specification and shall require the agreement of the CustomerProject Management for becoming effective requirements to be verified anddemonstrated in the further phases of the System Lifecycle by means ofappropriate activities of the RAM Programme.2.2.2.3.3 Corrective MaintenanceThe Corrective Maintenance Requirements are subdivided in two categories:General Quantitative Requirements and Specific Quantitative Requirements.• General Corrective Maintenance Quantitative Requirements regard themaximum standstill times tolerable in the case of any unscheduled repairs;they represent operative requirements [2.4].• Specific Corrective Maintenance Quantitative Requirements regard the allowedtimes for detecting/locating faults, replacing faulty modules and restarting thesystem interested by the failure occurred; they represent design requirementsDoc. Ref.: 02s1266- page 28/83