Recording Variable Data for GD&T and Dimensional Tolerances in FAI
Published .
Related
- ASME Y14.5
Topics
- fai
- gd-t
- inspection
- documentation
- variable-data
- as9102
- metrology
A supplier submitted a First Article Inspection (FAI) package for a machined component with several engineering requirements defined by Geometric Dimensioning and Tolerancing (GD&T), including a profile of a line callout. Upon review, the prime contractor's quality engineer noted that the inspection results for these features were recorded as 'Pass' on the FAI forms. The report lacked any quantitative measurement data for these characteristics.
The FAI package was non-compliant because it failed to include variable (quantitative) data for design characteristics that have numerical acceptance criteria. Per AS9102, recording only attribute data like 'Pass' or 'Accept' is insufficient for dimensional features, as the actual measured result must be documented.
Key Takeaways
- The supplier had to update the FAI package to include specific measurement results for all GD&T and dimensional features on Form 3 before resubmitting for approval.
- The FAI package was non-compliant because it failed to include variable (quantitative) data for design characteristics that have numerical acceptance criteria.
- Per AS9102, recording only attribute data like 'Pass' or 'Accept' is insufficient for dimensional features, as the actual measured result must be documented.
Common Mistakes
- Missing balloon numbers on the drawing.
- Title block requirements not accounted for on Form 3.
- Drawing notes not captured as characteristics.
Best Practice
Ensure all design characteristics with specified numerical limits, including GD&T features like profile, are reported with quantitative variable data in the First Article Inspection Report. Relying on attribute 'Pass/Fail' documentation for dimensional requirements does not satisfy the intent of AS9102 and can lead to FAI rejection.
Reflects the recommended position based on community discussion and expert review.
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