Manual for Life Cost Based FMEA
Development & Design
operation field failure
prototype fabrication / testing assembly flaw
failure (cause) introduced
failure (effect) discovered
Figure 2. Initial Origin and Detection Stages of Failure
Detection Time: Time to realize and identify a certain type of failure that has
occurred and diagnose the exact location and its root cause.
Fixing Time: Time to fix each individual component.
remanufacturing, and reinstallation are some examples of activities that lead to fixing time.
Delay Time: Time incurred for a non-value activity such as waiting for
technicians to respond, set up time, and mailing/shipping time.
Loss Time: Time during which the system has been shut down and has not
produced any value.
Only applies to failures that happen during
operations stage. Delay time. Loss
Loss time is the sum of Detection time, Fixing time, time is used to calculate the opportunity cost of failure.
Table 5 shows a Life Cost-Based FMEA table that is filled-in for this methodology. The “Outputs” in this table are the 3 main components of Failure cost: labor cost, parts cost, and opportunity cost. Labor and opportunity costs are dependent on time and parts cost is dependent on material cost. Units for time penalties are in hours.
FMEA MANUAL By S. Rhee and C.M. Spencer