FMEA Maintainability Analysis
FMEA analysis can be extended to identify maintainability design features requiring corrective action and to establish early criteria for:
• Maintenance Planning Analysis (MPA).
• Logistics Support Analysis (LSA).
• Test planning.
• Inspection and checkout requirements.
To extend a FMEA to include maintainability analysis, use a worksheet that includes columns for indicating the maintenance activities to be performed. In MIL-STD-1629, the Task 103 worksheet displays columns necessary for maintenance planning. These columns are described in Table 6-7.
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Column
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Description
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Failure Predictability
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Indicates operational performance variations peculiar to the failure trends for this item that can be used to predict failures. Includes data that must be collected and explains how it is to be used to predict the failure. Identifies any tests or inspections that must be performed to detect evidence of conditions that cause the failure mode.
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Failure Detection Means
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Indicates how the failure mode is to be detected by the organisational level maintenance technician and to what indenture level it is to be localised. If more than one failure mode causes the same failure indication, presents the method by which ambiguities are to be resolved. Describes any monitoring or warning devices that indicate impending failure. Indicates any planned test or inspections that can detect occurrence of the failure mode.
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Basic Maintenance Actions
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Describes the basic actions that the maintenance technician must take to correct the failure. Identifies special design provisions for modular replacement and any adjustments and calibrations required after repair.
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In the FMEA report, maintainability analysis worksheets generally follow the failure mode and effects worksheets and the criticality analysis worksheets for the same indenture level.
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Damage Mode and Effects Analysis (DMEA) is also an extension of a FMEA. For additional information on DMEAs, refer to Task 104 in MIL-STD-1629.
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