Editing Availability (section)

=== Methods and techniques to model availability ===

[[Reliability block diagram|Reliability Block Diagrams]] or [[Fault Tree Analysis]] are developed to calculate availability of a system or a functional failure condition within a system including many factors like:

* Reliability models
* Maintainability models
* Maintenance concepts
* Redundancy
* Common cause failure
* Diagnostics
* Level of repair
* Repair status
* Dormant failures
* Test coverage
* Active operational times / missions / sub system states
* Logistical aspects like; spare part (stocking) levels at different depots, transport times, repair times at different repair lines, manpower availability and more.
* Uncertainty in parameters

Furthermore, these methods are capable to identify the most critical items and failure modes or events that impact availability.