Hypothetical situation:

Gull wing lead, land pattern error, zero heel (also zero toe) fillet.
Hardware would not meet Class 3 workmanship requirements.

An equation is being used to decide if the pad to gull wing lead lap
solder joint is adequate to survive the intended thermal cycling
environment.

This would have been a question for Werner but I am sure there are
others here who can shed some light on this for me.

I know that part of the justification for why we have set our IPC
standards where they are is partly based on years of testing.

How could a mathematical calculation such as "Steinberg equation"
justify a lack of Class 3 gull wing lead heel fillet?

Any help is appreciated.





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