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Level of Repair Analysis Student Version

Systems Reliability, Supportability and Availability Analysis. Level of Repair Analysis Student Version. Introduction. Level of Repair Analysis utilized to develop support concept of system during acquisition process Complex system with thousands of assemblies, sub-assemblies, components, etc.

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Level of Repair Analysis Student Version

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  1. Systems Reliability, Supportability and Availability Analysis Level of Repair AnalysisStudent Version

  2. Introduction • Level of Repair Analysis utilized to develop support concept of system during acquisition process • Complex system with thousands of assemblies, sub-assemblies, components, etc. • Optimal provision of repair and maintenance facilities to minimize overall life-cycle costs • LORA Concept: • Organizational Repair • Discard at Point of Failure • Depot Repair • Intermediate Repair • Contractor Repair

  3. Illustrative Example

  4. When LORA is performed Initial Sustainment Level of Repair Analysis

  5. Major Phases What is the most cost effective support solution? Where can I perform maintenance? What can be repaired?

  6. Standards • MIL-PRF-49506 • MIL-HNBK-502 • AR 700-127 • AR 750-1

  7. Sparing to Availability • Standard initial provisioning computations for computing stockage requirements old way of doing business • Retail stockage criteria • Operating level at ORG, DSU, and GSU • Availability • Different ways of calculating • Inherent, Achieved and Operational LDT, ADT, MTTR

  8. Optimization Approach Maintenance Policy Availability Constraint Cost Ceiling Cost > $max A0 < 95 % Recommended Policy Cost above optimum Solution Space Optimum Policy Field Repair/Replace Strategy Depot Repair/Replace Strategy Distance from Organizational Unit

  9. Important Definitions • End Item • Highest level of Indenture • System, an end item, a major assembly of an item, or an item itself • LRU/NLRU • LRU removed and replaced • Restores end item to operationally ready condition • Directly from the end item • SRU/NSRU • SRUs are items that are part of an LRU • SRU will repair the failed LRU • SRU repair is off-equipment maintenance

  10. Important Inputs • Twelve Categories (DoD COMPASS model) • System information • Supply • Common labor • Transportation • Support equipment • Repairmen • End item • Line Replaceable Unit (LRU) • Shop Replaceable Unit (SRU) • Non-reparable LRU/SRU

  11. Important Outputs • Maintenance concept • Allocation and cost of support equipment and repairmen • Replacement task distribution • Maintenance task distribution • Amount and cost of initial spares • Cost of consumption spares • Overall Life Cycle Logistics Cost (LCLC) of the system ALWAYS KEEP THE MODEL ASSUMPTIONS IN MIND

  12. Optimized Maintenance Policy

  13. Identification of Candidates • LORA process is primarily applied to corrective maintenance actions after the Failure Modes and Effects Criticality Analysis (FMECA) has been performed. • Preventive and corrective maintenance actions are analyzed separately

  14. Non-Economic Analysis • Provides a means of examining the factors that determine the maintenance level for repair analysis candidates. • Addresses the pre-empting factors that override cost considerations or existing repair analysis decisions on similar systems. • A pre-empting factor is a restraint, stipulation, or special requirement that forces the repair or discard decision to a specific maintenance level or limits the support alternatives available

  15. Non-Economic Analysis (cont.) • The non-economic LORA is a logical sequence of questions concerning factors that affect the level at which repair or discard can be performed. • questions in the following non- economic analysis table should be asked of each item on the repair analysis candidate list • response—“yes” or “no”—reflects the maintenance level where repair or discard decisions are restricted and the reason for the restriction • analyst determines a preliminary maintenance concept based on the “yes” responses • “No” responses should be determined, but need not be reported

  16. Importance of Non-Economic LORA • Constraints Determination • Preempting factors, which override cost considerations or existing LORA decisions

  17. Break

  18. Sensitivity Analysis

  19. Sensitivity Analysis Example (Class Exercise)

  20. Indenturing Example 1: Too Many Levels

  21. Indenturing Example 1 (cont.)

  22. Indenturing Example 1 (cont.)

  23. Indenturing Example 2: Multiple LRUs

  24. Indenturing Example 3: LRU within LRU

  25. Break

  26. COMPASS SOFTWARE

  27. COMPASS Software Introduction https://www.logsa.army.mil/lec/compass/

  28. Unit Price Turn Around Times Labor Rates Contractor Costs Target Availability Inputs Support Structure Failure Rate COMPASS uses mixed integer programming to connect a multitude of inputs to arrive at an optimal result. Non-linear programming is used to calculate initial spares. Outputs Cost Resources Required Maintenance Policy Obtained from Army Slides

  29. COMPASS Inputs • Two categories • System level • Component level • System level Inputs • Population characteristics • Operating Environment • Support structure concept • Component level inputs • Indentured system • Repairable inputs • Contractor repair

  30. LRU Data

  31. NLRU Data

  32. SRU Data

  33. NSRU Data

  34. Additional Inputs

  35. COMPASS Output Reports

  36. Putting it All Together: Comprehensive Example

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