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Mean time to repair (MTTR) is a basic measure of the maintainability of repairable items. It represents the average time required to repair a failed component or device. [ 1 ] Expressed mathematically, it is the total corrective maintenance time for failures divided by the total number of corrective maintenance actions for failures during a ...
Mean time to recovery (MTTR) [1] [2] [3] is the average time that a device will take to recover from any failure. Examples of such devices range from self-resetting fuses (where the MTTR would be very short, probably seconds), to whole systems which have to be repaired or replaced.
where MTTR is the mean time to repair. The MTTF of a system is the sum of MTTF S and MTTF D. To understand the relationship between MTTF S and MTTF D consider the case of a switch that turns a motor on or off. The switch has two failure modes: the switch can fail stuck closed or the switch can fail stuck open.
Mean time to repair – Measure of the maintainability of repairable items; Power-on hours – The length of time that electrical power is applied to a device; Reliability engineering – Sub-discipline of systems engineering that emphasizes dependability; Residence time (statistics) – Statistical parameter of random process evolution
Field-tube A form of water-tube where the water tubes are single-ended, similar to a thimble water tube with an internal tube to encourage circulation. Firebar Replaceable cast-iron bars that form the base of the furnace and support the fire. These wear out frequently, so are designed for easy replacement. See also: Rocking grate. Firebox
The inclusion of delay times distinguishes mean down time from mean time to repair (MTTR), which includes only downtime specifically attributable to repairs. [1] Mean Down Time key factors: SYSTEM FAILURE. Identification & Recovery Time. First, the fact that the system is down must be identified, and maintainers notified & brought to action
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