According to the explanations and examples in the previous paragraphs, FMECA analysis is done on components/assemblies level. In addition, the analysis can be performed on the functional blocks level.

Inside one assembly, components can be grouped by functional blocks. In a functional block, functions are defined for a group of components. You can enter more then one functional block (FB) for each component. In this way you can hide components and work (enter FM->NHE->EE chains etc.) with functional blocks. This significantly reduces the work required to enter Failure Modes for an assembly with a large number of small and insignificant components.

The Failure Rate of the functional block is equal to a total FR of all components included into the block.