Level of Repair Analysis

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

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. Simple LORA Case

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); • Nonreparable LRU; • Nonreparable SRU • Additional fields

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. LORA Candidate Identification • 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. 10 Minute Break

18. Shorthand LORA Example

19. Sensitivity Analysis

20. Sensitivity Analysis Example (Class Exercise)

21. Indenturing Example 1: Too Many Levels

22. Indenturing Example 1 (cont.)

23. Indenturing Example 1 (cont.)

24. Indenturing Example 2: Multiple LRUs

25. Indenturing Example 3: LRU within LRU

26. 10 Minute Break

27. COMPASS SOFTWARE

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

29. 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

30. 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

31. LRU Data

32. NLRU Data

33. SRU Data

34. NSRU Data

35. Additional Inputs

36. COMPASS Output Reports