MIL-HDBK-1390
4.6.3 LORA report iterations. The LORA process is iterative. It begins with the initial LORA and
continues, with required updating, until submission and approval of the final LORA report. After the LORA report
is reviewed, the requiring authority should notify the performing activity as to the acceptance of the report or of the
necessity for redoing the LORA effort or report. The acceptance of the report not only means acceptance of the
recommended repair decision, but it also implies agreement with the technical data, repair times, test equipment
requirements, and other projections used in the analysis. In this regard, reviewing personnel should make sure that
any projections within the report are also acceptable. The request to redo a LORA or LORA report should be made
when the LORA recommendations are considered invalid. Corrections to technical data, test equipment, and spares
projections that do not change the recommended repair level should be annotated in the LORA report. Any
approved recommendations which have been suggested in a LORA review should be incorporated into the LORA
report for submission.
4.6.4 LORA on a fielded system. A fielded system LORA may be conducted to identify and evaluate
potential benefits derived through reexamination of the maintenance concept of the system. This type of LORA can
validate whether or not the actual maintenance concept used for the fielded system is in close agreement with the
maintenance concept determined in the LORA. If the maintenance concepts are not in agreement, then a new
analysis needs to be conducted to determine whether it would be beneficial to change from the current in-place
maintenance concept to the optimum maintenance concept identified by the new LORA.
4.6.5 Importance of sensitivity evaluations. Performing sensitivity evaluations as part of the LORA process
is important to the designer and to the end user. Sensitivity evaluations can serve as a means of understanding the
risks involved with a particular selection during stages of the acquisition process. Early in a program, many of the
input factors may be estimates based on expert opinion, similar system data, or best guess. By performing
sensitivity analysis, the designer can determine whether the repair level selected is firm or marginal. Sensitivity
evaluations test the stability of the system under varying conditions and the effect of uncertain data.
LORA decision process. FIGURE 2 represents the decision process that takes place during the
4.7
execution of the LORA program. The first step in the process is obtaining the preliminary design in which
engineering drawings are developed along with preliminary technical, logistic, and economic data. Using the
drawings, a list of candidates are determined that will be the source of the LORA evaluations and input to the LORA
model. The preliminary data for both the system and candidate items (i.e., MTBF, unit cost, support equipment, and
personnel requirements) are part of the LORA input data necessary to perform the LORA evaluations. Next is the
identification of any preempting factors (i.e., safety, repair feasibility, mission success, readiness, environmental
impacts) which would necessitate the performance of a noneconomic LORA evaluation. Regardless of any
preempting factors, an economic LORA evaluation should be performed in order to generate a LORA
recommendation identifying the least cost decision alternative. If this analysis recommends a repair decision, the
LORA process continues to the optimum repair level (i.e., depot, intermediate, organizational) according to the
service specific repair requirements. However, the analysis may recommend a discard decision as the least cost
alternative. Then the sensitivity evaluation is conducted to assess the economic risks of these LORA decisions when
uncertainty exists in the system design. The LORA repair versus discard decision is recorded in the LORA report
and will significantly influence the maintenance concept. The LORA report documents the results of each of the
maintenance alternatives for the candidate items, the results of the noneconomic and economic LORA evaluations,
the results of the sensitivity analysis, and any conclusions or recommendations made by the performing activity to
the requiring authority. If major changes are made to the system design or if the service specific timeframe for re-
examination has expired, the LORA input data elements will be updated to reflect these changes and the entire
LORA analytical process is repeated.
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