adequately with technical uncertainties
& Quality Management
according to established standards
The only publicly available mechanical MTBF calculation standard is
NSWC-11 (National Surface Warfare Center, Crane Division, 2011). Since
this special standard addresses only dedicated military
shipboard equipment, it has almost no importance for mechanical
components in general.
For electronic equipment however, the analyst can chose between the
list is ordered
by recognition in Europe.
Mil-HDBK-217 is the most popular standard in Europe, followed by
These two standards however are also globally the most
Each of these standards have unique advantages and disadvantages. The
failure rates on component level across standards can be terribly
different even for the same component type.
Sometimes the analyst has a real choice and can therefore identify the
best suitable standard from an engineering viewpoint.
In most cases however the analyst must use the standard mandated by
the customer, authoritiy, political interests and conventions of
the particular industry.
statements could be made depending on
- In comparison with other standards, Mil-HDBK-217 yields always
the worst results, even with the use of ANSI/VITA 51.1
- Choosing Mil-HDBK-217 is technically almost always on the safe
- Telcordia Issue 4 and IEC-TR-62380 almost always yield the best