encyclopedia

FAIL OPERATIONAL

A characteristic design which permits continued operation in spite of the occurrence of a discreet failure. (NTSC)

FAIL OPERATIONAL FAIL SAFE

A system characteristic which permits continued operation on occurrence of a failure while remaining acceptably safe. A second failure results in the system remaining safe, but non-operational. (NTSC)

FAIL-SAFE DESIGN

A design principle in which each of the elements which make up a system is analyzed to determine the potential consequence of failure of that element, alone or in combination with any or all other elements of the system, to…

FAIL-SAFE SAFETY

A characteristic of a system and its elements, the object of which is to ensure that any fault or malfunction will not result in an unsafe condition. (NTSC)

FAILED COMPONENT

A component which has ceased to perform its intended function. (NTSC)

FAILURE ANALYSIS

The logical and systematic examination of a system to identify and analyze the probability, causes, and consequences of potential and real failure. (NTSC)

FAILURE ASSESSMENT

The process by which the cause, effect, responsibility, and cost of an incident (reported problem) in the transit system is determined and reported. (NTSC)

FAILURE CRITICALITY ANALYSIS

Study of the potential failures that might occur in any part of a system in relation to other parts of the system in order to determine the severity of effect of each failure in terms of a probable resultant safety…

FAILURE EFFECT ANALYSIS

The study of the potential failures that might occur on any part of a system in order to determine the probable effect of each on all other parts of the system. (NTSC)