I have a few questions regarding the requirements of IPC-6012B
classification "3A" (ref. "IPC-6012B Performance Specification Sheet for
Space and Military Avionics"):

- Why does the Performance Sheet define NEGATIVE ETCHBACK (3.6.2.8) as being
unacceptable?

- The description of "Through Via Plugging" requires clarification - is the
Performance Sheet indicating that Vias and Through Holes cannot be plugged?
If so, why?

Thanks,

Dave Schaefer

Bristol Aerospace

(204)775-8331 ext 3186

 

 

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