Out of Tolerance Impact Review

This review is one step in a larger programme. Using it for work that belongs to a neighbouring template produces records that are hard to report on later.

ISO 9001 cl.7.1.5 does not tell you how to run this review; it tells you that you must. It requires determining whether previously reported measurement results were adversely affected once equipment is found unfit, and taking appropriate action, without prescribing a look-back method, which is left to be defined and followed consistently.

The duty to assess the effect of a calibration failure comes almost entirely from the quality and food safety management standards a site is certified to, rather than from a single national regulation naming test equipment.

The fields ask for a date, a direction and a batch count. What determines whether the review is defensible is how far those answers are actually chased down.

Findings on this review cluster around the gap between what was checked, usually the equipment, and what should have been checked, usually the product measured with it.

A filling line checkweigher, used as the monitoring instrument for a minimum fill weight critical control point, failed its weekly verification, reading light by more than tolerance. Quality opened the review the same day, marked direction as reading low, and pulled the production log for the day of the failure. The gauge was recalibrated, checked again, and passed. Retesting Possible was marked Yes on the strength of that recheck, and Product Conformity Confirmed was recorded as Probable. No batches were held.

The verification interval was weekly, so the gauge could have been drifting for up to nine days before the failure was caught, not one. A customer complaint about underweight cartons weeks later traced back to production before the day the log had covered, and the nine-day trace showed most of that run already despatched. The retest had confirmed the equipment was now correct; it had never asked whether the nine days of packs it had cleared were correct, the actual question the review existed to answer.

The review asks the right questions about the equipment. What fails is tracing the product with the same rigour, particularly when the retest checks the gauge and stops there.

KnowQuality

Holds the review against the test equipment register and calibration history, so the look-back window is calculated from the actual last known good date.

KnowMaintain

Links the review to the calibration work orders for the equipment, so a shortened interval or increased frequency decision reaches the maintenance schedule.

KnowLogistics

Tracks where affected batches physically are, on site, in transit or despatched, so the disposition decision matches reality rather than the production log alone.

Ella

Flags CCP-linked measurements where conformity is marked Probable with no recorded product retest, and holds the review open until answered.

Out of tolerance

A calibration or verification result outside the acceptable range for the equipment, confirming it was not measuring accurately at the point it was checked.

Last known good date

The date of the previous calibration or verification the equipment passed, which sets the start of the look-back window for what may have been affected.

Critical control point (CCP)

A step where control is essential to prevent or eliminate a food safety hazard; a measurement used at a CCP carries a higher standard of proof when the measuring equipment fails.

Retesting

Confirming the product itself, not just the equipment, still meets specification. A recalibrated gauge passing its own check is not a retest of the product measured before the recalibration.

Hold

A quarantine placed on product still physically on site to prevent its release or use while its status is being determined, tracked in its own record and referenced from this review.