adequately with technical uncertainties
& Quality Management
according to established standards
principle of MTBF calculations is described here.
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 literally no importance for mechanical
components in general.
For electronic equipment however, the analyst can chose between the
list is ordered
with respect to recognition in Europe.
Mil-HDBK-217 is the most popular standard in Europe, followed by
These two standards however are the most
common ones even on global level.
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 those standards mandated by
customers, authorities, 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, with or without the use of ANSI/VITA 51.1
- By choosing Mil-HDBK-217 the analyst is almost always on the safe
side with respect to customer questions and acceptance.
- Telcordia Issue 3 and IEC-TR-62380 almost always yield the best
- Telcordia Issue 4 may yield even better results, however
as of late 2016 I have no experience with issue 4.