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MAINTAINABILITY ENGINEERING
Maintainability engineering should be performed during the conception and design phase of a given program, this is critical to ensure that high system availability is obtained at optimum Life Cycle Support Cost. Key in the availability calculation of a system is its down time, the time required to bring a failed system back to its operational state or capability.
This down time is normally attributed to maintenance activities. An effective way to increase a system's availability is to minimize the downtime. The minimized downtime does not happen at random, it is made to happen by actively ensuring that full consideration is given during the conceptual and design phase. Therefore the inherent maintainability characteristics of a system must be assured. The sub-topics that maintainability engineering consists of are the Maintainability Program, Maintainability Assessment, Maintainability Modeling, Maintainability Demo, Design for Maintainability, and Defect Reporting.
As part of the engineering and design process, are to assist in complying with supportability and other ILS program objectives and requirements typically using MIL-STD-471, MIL-STD-471A, MIL-STD-280, MIL-STD-470, MIL-STD-721, MIL-HDBK-472 to accomplish maintainability analysis.
At RMS Aerospace we can assist you in the following areas of Maintainability Engineering:
- Reliability Maintainability Program Development (RMPP)
- Maintenance Planning Analysis (MPA)
- Maintainability Assessment
- Maintainability Modeling
- Maintainability Demonstration (M-Demo)
- Maintenance Cost Analysis (MCA/LCC)
- Design for Maintainability Analysis (DMA)
- Defect Reporting System(DRS)
- MSG-3/RCM
Maintainability Program Plan Development (RMPP):
The Reliability and Maintainability (R&M) Program Plan (RMPP) describes necessary tasks, responsibilities, and controls that should be implemented in a project. (If a project is very hardware-intensive and or complex, the RMPP may be split into several documents). The primary function of the R&M effort is to document the procedures; ensure both high operational readiness and availability; reduce life cycle costs. The RMPP should address aspects of design and engineering in relation to Management, Schedule, Analytical Tasks, Control Tasks, Evaluation, and Design.
Maintenance Planning ANALYSIS (MPA)
The maintenance program plan MPP provides a concise narrative of significant maintenance actions for the item described by a maintenance plan. The MPP address the three levels of maintenance (O, I, D) and preventive and corrective actions, integrated maintenance concept as applies to a item, and any unusual depth or frequency of maintenance, including if item is planned to have maximum operating time limit (or other life limits) applied.
MAINTAINABILITY ASSESSMENT ANALYSIS (MAA):
The objective of the maintainability demonstration and assessment is to evaluate the maintainability characteristics of a given project, including qualitative assessment of support resources such as required personnel skill levels, ground support equipment GSE, component support equipment SE, maintenance manuals, tools, and the maintenance concepts for organizational and intermediate levels of maintenance.
maintainability modeling (mMA):
An analytical model maintainability assessment assessment MMA is conducted during the conceptual and development phases of equipment design. The MMA attempts to provide a simple practical approach to quantify equipment maintainability for design trade-off analysis. A single station multi-station model is used to simulate a typically repair cycle. Maintainability design features are incorporated as the “factor-inputs” to the maintainability process.
Maintainability Demonstration (M-Demo):
The maintainability demonstration M-DEMO test procedures and methods for project verification, demonstration, and evaluation of qualitative and quantitative maintainability requirements. It also provides for qualitative assessments of various logistics support factors related to and impacting maintainability and component downtime, e.g. technical manuals, personal, tools and test equipment maintenance concept and provisioning.
Maintenance Cost Analysis (MCA/LCC):
Maintenance cost analysis MCC/LCC determines maintenance costs associated with man-hours per flight hour MMH/FM trends based on regression analysis to determine the expected operational maintenance requirements. Failure data is analyzed to determine system and subsystems reliability. Two reliability models are used for this analysis: an exponential model which assumes a constant instantaneous failure rate, and a Weibull model which can represent either an increasing or a decreasing failure rate.
DESIGN for Maintainability analysis (DMA):
The design for maintainability analysis DMA would be effectively implemented using MIL-STD-1472D Human Engineering Design Criteria for Military Systems, Equipment and Facilities, and MIL-STD-46855B Human Engineering Requirements for Military Systems, Equipment and Facilities provide good resources when considering issues associated with human factors. Where there are specific maintainability requirements or goals, which must be obtained for a system, then there is a need to determine the system's quantitative maintainability characteristics.
Defect reporting And corrective action system (DrACAS):
Defect Reporting and corrective action systems DRACAS are typically a closed loop system designed and applied to various types of manufacturing environments, that requires all users to report all defects and analyzed by maintainability engineering departments for corrective action if necessary. A defect reporting system should work in unison with the FRACAS reporting system. The main objective of developing and collecting the Data is for maintainability analysis.
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