Tighter Tolerances than Control Plan

#1
Is it acceptable to TS-16949 / AIAG to have work instructions / online controls that are dimensionally tighter than what you have written in the Control Plan? In the Control Plan are the dimensional and tolerance characteristics needed for the specific component. We want to be "better" than what they are asking for.
Appreciate our input.
 
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#2
Welcome to the Cove!

IATF, through TS16949 is interested in reducing defects, reducing costs of quality, improving process capability and increasing efficiency and effectiveness all at the same time. It is therefore absolutely acceptable to tighten your control limits, when doing so would help lower the likelihood of producing defective units and not going broke from the effort.

I would list the tighter limits in the control plan, and reference the original specifications if that helps.
 
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