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

More documents

Recommendations

Info

MIL-HDBK-502: ACQUISITIONALOGISTICS6.2.2 Differences Between Detail And Performance RequirementsReliability• Performance specifications would set requirements in terms of meantime between failure, operational availability, etc.• Detail specifications may achieve reliability by requiring a knownreliable design.Maintainability• Performance specifications would specify requirements in terms ofmean time to repair, maintenance frequency, skill levels of repairpersonnel, time required for maintenance, etc.• Detail specifications may specify exact designs to accomplishmaintenance actions.Reliability and Maintainability ParametersReliability and maintainability parameters affect readiness, mission success,manpower and maintenance costs, and other logistics support costs. Forthese categories reliability and maintainability can be expressed quantifiablyas shown in Figure 6-1:ReliabilityMaintainabilityReadiness mean time between mean time to(or availability) downing events restore systemMission Success mission time between mission time to(or dependability) critical failures restore functionsMaintenance mean time between direct man-hours perManpower Cost maintenance maintenance actionLogistic Support Cost mean time between total cost to remove a part atdemandsall levels of maintenanceFigure 6-1. Reliability and Maintainability6-7
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
Page 3: MIL-HDBK-502: ACQUISITIONALOGISTICS
Page 9 and 10: MIL-HDBK-502: ACQUISITIONALOGISTICS
Page 102 and 103:
MIL-HDBK-502: ACQUISITIONALOGISTICS
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
Page 110 and 111:
Page 112 and 113:
Page 114 and 115:
Page 116 and 117:
Page 118 and 119:
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Page 138 and 139:
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?