ABSTRACT
Equipment DT is derived by using reliability and maintainability parameters and support parameters. e DT is the sum of EMT, AWP time, and AWM time, and it can be expressed as follows:
DT EMT AWP AWM= + +
is parameter indicates repair time for corrective (unscheduled) maintenance. e EMT is a function of failure rate (FR), maintenance action rate, maintenance action to failure ratio, and MTTR. e AWP time combines mean operating hours between demands, not-repairable rates for the equipment, and expected available inventory to determine the expected length of time for which a part is not available. e AWM time is the expected length of time for which equipment cannot be worked on due to any other considerations such as unavailable personnel, administrative delays, logistics delays other than spare parts (e.g., SE) delays, and weather delay. is is usually derived from Želd data.
