System Failure Rate and Mean Time Between Failures
Upon completion of sub-system identification, serial and parallel configuration, etc., the final failure rate and Mean Time Between Failures (MTBF) of the system can be calculated. This calculation consists of the simple addition of the failure rates of each sub-system.
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Only add effective failure rates in the case of parallel and non-operational sub-systems.
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A total effective failure rate is often given in the diagram. (See Figure B-1.) The MTBF of the system can also be calculated by:
if Failure Rate has units of FPMH or 109 if in FITS).