What FAI checks
- Documentation — BOM revision, assembly drawing, approved deviations.
- Materials — component values, package and polarity against the BOM.
- Print — paste volume and alignment from SPI data.
- Placement — offset and rotation, especially for fine pitch.
- Solder — fillet shape, wetting and voids (X-ray for hidden joints).
- Test — ICT, flying probe or functional results against the test plan.
Who signs
The line engineer signs internally; the customer reviews when the build is new, the BOM changed or the product is safety-related. A first article held pending approval should stop the run, not merely be filed.
Record
Keep the report with the lot. If a defect appears later, the FAI is the baseline that shows whether the process changed.
