IEC 62278:2002 pdf download

IEC 62278:2002 pdf download.Railway applications – Specification and demonstration of reliability, availability, maintainability and safety (RAMS).
common cause failure
failure which is the result of an event(s) which causes a coincidence of failure states of two or more components leading to a system failing to perform its required function
3.7
compliance
demonstration that a characteristic or property of a product satisfies the stated requirements.
3.8
configuration management
discipline applying technical and administrative direction and surveillance to identify and document the functional and physical characteristics of a configuration item, control change to those characteristics, record and report change processing and implementation status and verify compliance with specified requirements
3.9
corrective maintenance
maintenance carried out after fault recognition and intended to put a product into a state in which it can perform a required function
3.10
dependent failure
failure of a set of events, the probability of which cannot be expressed as the simple product of the unconditional probabilities of the individual events
down time
time interval during which a product is in a down state
[IEC 60050(191), modified]
3.12
failure cause
circumstances during design, manufacture or use which have led to a failure
[IEC 60050(191)]
3.15
fault mode
one of the possible states of a faulty item, for a given required function
(IEC 60050(191)]
3.16
fault tree analysis
analysis to determine which fault modes of the product, sub-products or external events, or
combinations thereof, may result in a stated fault mode of the product, presented in the form of
a fault tree
3.17
hazard
physical situation with a potential for human injury and/or damage to environment
3.18
hazard log
document in which all safety management activities, hazards identified, decisions made and solutions adopted are recorded or referenced. Also known as a “Safety Log”
[ENV 50129]
3.19
logistic support
overall resources which are arranged and organised in order to operate and maintain the system at the specified availability level at the required life cycle cost
3.20
maintainability
protiability that a given active maintenance action, for an item under given conditions of use can be carried out within a stated time interval when the maintenance is performed under stated conditions and using stated procedures and resources
[IEC 60050(191))
3.21
maintenance
the combination of all technical and administrative actions, including supervision actions, intended to retain an item in, or restore it to, a state in which it can perform a required function
[IEC 60050(191)]
3.22
maintenance policy
description of the inter-relationship between the maintenance echelons, the indenture levels and the levels of maintenance to be applied for the maintenance of an item
[IEC 60050(191)]
3.23
mission
objective description of the fundamental task performed by a system
3.24
mission profile
outline of the expected range and variation in the mission with respect to parameters such as time, loading, speed, distance, stops, tunnels, etc. in the operational phases of the life cycle
3.25
preventive maintenance
maintenance carried out at predetermined intervals or according to prescribed criteria and intended to reduce the probability of failure or the degradation of the functioning of an item
(IEC 60050(191))
3.26
Railway Authority
body with the overall accountability to a Regulator for operating a railway system
NOTE Railway Authority accountabilities for the overall system or its parts and life cycle activities are sometimes split between one or more bodies or entities. For example:
— the owner(s) of one or more parts of the system assets and their purchasing agents:
— the operator of the system:
— the maintainer(s) of one or more parts of the system;
— etc.
Such splits are based on either statutory instruments or contractual agreements. Such
responsibilities should therefore be clearly stated at the earliest stages of a system life cycle
3.27
railway support industry
generic term denoting supplier(s) of complete railway systems, their sub-systems or component parts
3.28
reliability and maintainability programme
documented set of time scheduled activities, resources and events serving to implement the organisation structure, responsibilities, procedures, activities, capabilities and resources that together ensure that an item will satisfy given reliability performance and maintainability performance requirements relevant to a given contract or project
3.29
RAMS
acronym meaning a combination of Reliability, Availability, Maintainability and Safety
3.30
reliability
probability that an item can perform a required function under given conditions for a given time interval (t1, t2)
[IEC 60050(191)]
3.31
reliability growth
condition characterised by a progressive improvement of a reliability performance measure of an item with time.