Layered Process Audit (LPA) Checklist, Free Export

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12 critical items still open - these are the highest-risk gaps.

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Setup and work instructions

Current work instruction is posted at the station and matches the control plan revisionCRITICALSetup sheet or first-piece approval is completed for this shiftCRITICALOperator can state the key quality characteristics of the partTooling, fixtures and gauges are the correct revision and in good conditionProcess parameters on the machine match the setup sheetCRITICALOperator has current training records for this operationStandard work or job aid is legible and not damaged

Material and identification

Material at the point of use is correctly labeled and matches the work orderCRITICALOnly one part number is at the station unless segregated and identifiedFIFO is followed and no expired or quarantined material is presentCRITICALNonconforming material is in a labeled red bin or quarantine areaContainers and racks are identified with part number, lot and quantityRework or repair material is tracked separately with an approved procedure

Inspection and gauging

Gauges are within calibration date and show a valid labelCRITICALOperator performs the inspection frequency defined in the control planCRITICALInspection results are recorded legibly and on timeControl charts are plotted and out-of-control signals have a documented reactionGo and no-go or master samples are available and checked per scheduleCRITICALError-proofing devices are verified at the defined frequencyCRITICALVisual standards or boundary samples are at the station

Reaction and containment

Operator knows the reaction plan when a defect is foundCRITICALSuspect product from the last good check is contained and identifiedCRITICALOpen quality alerts or customer complaints are posted and understoodOperator can stop the line and escalate without penaltyPrevious audit findings at this station have been closed

Housekeeping and safety that affect quality

Work area is clean and free of foreign material that could contaminate the productNo unauthorized personal items, food or tools at the stationPackaging and shipping labels match the customer requirementCRITICALMachine guards and safety devices are in place

Mark each item as conforming or not. Any critical item that fails needs immediate containment and a corrective action. Rotate the audit layers: supervisors daily or per shift, managers weekly, plant leadership monthly.

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How to run layered process audits

Pick a process, select the questions that apply, and audit at the station while the process is running. Layer one is usually the production supervisor, layer two a quality or engineering lead, and higher layers plant management. Keep each audit to ten or fifteen minutes. Audit different shifts, and record both conforming and nonconforming answers so you can trend them. Print the list or export it to Excel to log results by station.

The thinking behind LPA

Layered process audits are widely used in automotive supply chains and are described in the AIAG CQI-8 guideline, and many OEMs require them after a quality escape. The idea is that if the operator, supervisor and manager all see the same process regularly, drift gets caught before it ships. The questions should come from your own PFMEA and control plan, focusing on high-risk steps and past failures. Generic questions that never fail are a signal to rewrite the list.

Use PFMEA severity and past complaints to choose questions
Rotate questions so auditors do not tick boxes
Escalate persistent failures to the management layer
Retire questions that have passed for a long time and add new ones

Common mistakes and ERP notes

The usual failures are audits done at the desk, auditors who only accept the answer they expect, and findings that never reach a corrective action. If your ERP or MES holds work orders and quality records, link each audit to the work order or lot being run so a failure can be traced to the exact product. Track closure time of findings, not just the number of audits completed.

Frequently Asked Questions

How often should layered process audits be done?

Frequency depends on risk. Many plants audit daily at the supervisor layer, weekly at the quality or engineering layer and monthly at the management layer. After a customer escape, customers often require a higher frequency for a set period.

Is LPA required by IATF 16949?

IATF 16949 requires process audits and manufacturing process audits, but does not name layered process audits. Many OEM customer-specific requirements ask for them, especially after quality problems, so check your customer requirements.

Who should perform the audits?

Auditors should be trained and should not audit their own work area only. Supervisors, quality staff, engineers and managers all take part. The value comes from different levels looking at the same process with the same questions.

How do I choose the questions?

Start with your PFMEA high-severity items, past customer complaints, and the control plan. Add questions on setup, material control, inspection and reaction plans. Review the list every quarter and replace questions that never find problems.

If you want audit results, scrap and complaint data viewed together from your ERP, Netray builds private dashboards on your own servers. The checklist works fully on its own.

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Layered Process Audit Checklist for Automotive Plants