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The Instant Units is a calculated field that is equal to the number of units entered, multiplied by the PA, UPA, OE, and PF. Notably, UA is not included, as the Use of Availability is determined by the schedule. Conceptually, the Instant Units is the exact number of trucks expected to be available for use at any instant over the schedule.
Although the Instant Units is the mode of the number of trucks that are expected to be available, the number of trucks that will be available on any day is based on a binomial probability distribution. However, there’s no practical way of using this probability distribution in APS, so we are just using an approximation of the mode (not an integer).
Notably, UA is not included, as the Use of Availability is determined by the schedule. Conceptually, the Instant Units is the exact number of trucks expected to be available for use at any instant over the schedule.
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If UA is specified, it is still possible to run out of hours at the end of each period. Therefore, if Dispatch mode is enabled, it is strongly recommended to set UA to be 100%. |
Fleet Use of Availability
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