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

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MIL-HDBK-502: ACQUISITIONALOGISTICSanalysis. These summaries may also be used by the government to developinitial fielding plans for the end item’s support structure. The conclusionsmay include actions and recommendations for influencing the systemdesign; and a list of which items should be repaired and which should bediscarded. These summaries may identify for each item being repaired thelevel of maintenance at which the repair should be performed and theassociated costs. They may identify, for the system support structure, theoperational readiness achieved and the placement and allocation of spares,support equipment, and personnel.These summaries may also include supporting information for the analysisperformed. For example:• a list of the input data (e.g., failure rates, repair times, etc.) andtheir corresponding values• sources of the data• operational scenario modeled• assumptions made• constraints (i.e., non-economic factors) imposed on the system• maintenance alternatives considered (i.e., use of supportequipment/personnel, BIT/BITE, and supply and maintenancefacilities)• the analytical method or model used to perform the economicevaluations• discussion of the sensitivity evaluations performed and resultsobtainedInput data for maintenance repair analysis can come from logisticsmanagement information files; other systems engineering analyses orprograms (e.g., transportation analysis, safety assessment, reliability,availability and maintainability); and historical data bases for similarsystems.Economic evaluations may consider cost factors (e.g., spare parts,transportation, inventories, labor, and training) and performance factors(e.g., mean time to repair, operational availability, and mean time betweenfailures). Non-economic evaluations may consider preemptive factors (e.g.,safety, vulnerability, mobility, policy, and manpower) that restrict orconstrain the maintenance level where repair or discard can be performed.Sensitivity evaluations should be conducted to assess how variations ininput parameters affect the baseline maintenance concept and associatedrisks. Two significant areas that may be assessed during sensitivityevaluations are changes in repair level assignments for an item and total lifecycle cost. Figure 7-3 presents a sample summary layout.7-9
MIL-HDBK-502: ACQUISITIONALOGISTICSREPAIR ANALYSIS SUMMARYSUMMARY: Analysis was performed based upon planned fielding to all 46 sites currently employing the AutonomousRobotics System (ARS) as well as the 23 sites where fielding is planned. The IPCS will replace existingPCSs at the current sites and will be fielded with the ARS at the other 23. As the ARS Test Set has already beendeveloped, fielded to the existing sites, and programmed for the other sites, its cost was considered sunk. Developmentcosts for the revised test program set have been included. Training costs have not been included, as no additionaltraining requirements exist over current training program. No additional equipment costs are foreseen forthe contact team. Annual operating time of 2400 hours per system was considered, per existing ARS specification.ITEM Remove/Replace Repair DisposeIPCS n/a USER n/aCONTROL UNIT USER ORG DEPOTKEYBOARD ORG TOSS 1 CONTACT TEAMINTERFACE UNIT ORG CONTACT TEAM DEPOTDISPLAY ASSY CONTACT TEAM DEPOT n/aDISPLAY DEPOT DEPOT DEPOTCABINET DEPOT DEPOT DEPOTCCA DEPOT MANUFACTURER n/aCPU ORG CONTACT TEAM DEPOTPOWER SUPPLY CONTACT TEAM TOSS CONTACT TEAMCCA Controller CONTACT TEAM DEPOT DEPOTCCA Memory CONTACT TEAM TOSS 2 DEPOTANTENNA ASSY n/a n/a n/aANTENNA USER n/a 3 USERCABLE ASSY USER CONTACT TEAM CONTACT TEAMPOWER ASSY n/a USER n/aBATTERY ASSY USER n/a DEPOT 4CABLE ASSY USER CONTACT TEAM DEPOTAC/DC CONVERTER USER TOSS CONTACT TEAM.NOTES:1 While most repairs by removing and replacing components is not cost effective, a general cleaning in the contactshelter with existing ARS equipment may return some items to service.2 Although the capability exists to replace blown memory chips and the overall support costs are slightly lowerthan the toss option (see page 3 for cost comparison matrix), the low failure rate of the card (see input valuesbeginning on page 6) together with the rapidly expanding capabilities of the technology lead us to recommendtossing the memory cards. . 3 No analysis of antenna was performed, as is simply not repairable.4 Disposal at depot is selected not based upon economics but rather on environmental laws and concerns. Thisdecision was documented during the Critical Design Review and the information is simply presented here to be allinclusive of the system.Assumptions and Sensitivities:1. No estimates of failure rates were available from the manufacturer of the display CCA. While the new CCA ismarketed as far more reliable, the value of the old CCA was used. Sensitivity analysis performed using values from75% to 150% showed no change in maintenance policy.Figure 7-3. Sample Repair Analysis Summary7-10
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MIL-HDBK-502 - Barringer and Associates, Inc.

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