MIL-HDBK-502 - Barringer and Associates, Inc.

MIL-HDBK-502: ACQUISITIONALOGISTICS6.2.3 Sample Performance RequirementsAvailabilityThe following areas—availability, compatibility, transportability,interoperability, etc.—are some of those in which requirements should bestated in performance terms. In each category an example of asupportability requirement expressed in performance terms is provided.These examples illustrate only one of many requirements that might beimposed.A measure of the degree to which an item is in an operable andcommittable state at the start of a mission when the mission is called for atan unknown (random) time.ExamplesThe item will have an operational availability of .95 measured by the totaloperating time divided by the sum of the total operation time, totalcorrective maintenance time, total preventive maintenance time, and thetotal administrative and logistics down time.The vehicle will have a maintenance ratio (MR) of the total scheduled andunscheduled maintenance man-hours per hour of operation (excludingoperator/crew checks and daily operating service) that does not exceed thefollowing values: (1) ORG 0.140; (2) DS 0.043; (3) Total 0.183.Operational SustainabilityThe capability of an item or system, and its inherent support structure, toperform its intended missions over a sustained period of time.Example(Requirement) The portable control station will be capable of completinga sustained 4-day operation using only onboard equipment and spareswithout resupply or support from personnel other than the operators.(Verification) The operational test of the system will be used to verify therequirement is met. The test will consist of 2 systems performing 4 each ofScenario A, as identified in the ORD, and 2 each of Scenario B (surge), asidentified in the ORD. Nine of the 12 scenarios must be fully executedwithout outside resupply/assisted maintenance. Additionally, at least onesurge scenario must be completed without outside resupply/assistedmaintenance.6-8