The purpose of this step is Functional Failure Mode and Effects Analysis for MSI (maintenance significant items).

For items with single function regular FMECA analysis should be performed. For items with multiple functions defined as functional blocks the FMECA analysis should be performed for the functional blocks:

See chapter 18 "FMECA" for information about FMECA analysis module.

Additional possibility in FMECA analysis required for MSG-3 is specification of multiple causes of Failure Mode. All possible causes of a single failure mode should be specified in the "Cause" column. Put double backslash delimiter between different causes to perform MSG-3 analysis step 5 separately for each of the causes. If "Cause" column does not appear in FMECA grid switch it on using the FMECA Grid Customization options.