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FMEA and FMECA Process

How to Perform a FMEA Analysis?

What are the
effects of box
failures on the
system?
What are the
effects of
board failures
on the box?
What are the
effects of part
failures on the
board?
Facts and Tips About FMECA:

  • FMECAs should begin as early as possible. This allows the analyst to affect the
    design before it is set in stone. If you start early, as you should, expect to have
    to redo portions as the design matures.

  • FMECAs take a lot of time to complete.

  • FMECAs require considerable knowledge of system operation necessitating
    extensive discussions with software/hardware Design Engineering and System
    Engineering.

  • Spend time developing ground rules with your customer up front.  
The FMECA Analysis Process:

    1) Define the system

    2) Define ground rules and assumptions

    3) Construct system block diagrams

    4) Identify failure modes

    5) Analyze failure effects / causes

    6) Feed results back into design process

    7) Classify failure effects by severity

    8) Perform criticality calculations

    9) Rank failure mode criticality

    10) Determine critical items

    11) Feed results back into design process

    12) Identify means of failure detection, isolation and compensating provisions

    13) Document the analysis. Summarize uncorrectable design areas, identify
    special controls necessary to mitigate risk.

    14) Make recommendations

    15) Follow up on corrective action implementation / effectiveness
Be sure and visit our FMEA Examples page for additional FMEA information and
FMECA examples.
The example below is a bottoms-up approach to a Design FMEA, but a tops-down
approach could also be used. Also, this example shows a hardware FMEA
approach, but the system you are analyzing could represent hardware, functions,
interfaces or a combination of all these items, which make up the design.
fmea fmeca
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