Heat Treat Pyrometry AMS2750 Readiness Checklist

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

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Furnace classification and instrumentation

Each furnace has a documented class and instrumentation typeCRITICALThe class matches the most demanding specification it is used forCRITICALFurnace working zone dimensions are defined and recordedControl, recording and over-temperature sensors are identified per furnaceSensor locations and numbering are documentedRecording instruments are in service and the chart or electronic record is retrievableFurnace identification is posted and matches the records

Thermocouples and calibration

Thermocouple types and wire grades are documented for each useCRITICALCalibration is traceable to national standardsCRITICALCalibration certificates are on file and reviewed for acceptanceInstrument calibration due dates are tracked in one systemExpired or out-of-tolerance sensors are tagged and removedReuse limits for expendable thermocouples are defined and followedCorrection factors are applied consistently where they are allowed

System accuracy tests and uniformity surveys

System accuracy test intervals are defined per furnace class and instrumentation typeCRITICALTemperature uniformity survey intervals are defined per furnace classCRITICALTest procedures are written and approvedTest sensors are calibrated and used within their limitsFailed tests trigger documented containment and a reaction planCRITICALSurvey results are reviewed against the allowed uniformity rangeLoad configurations tested are representative of productionNext due dates are visible to the furnace operators

Load records and traceability

Every load has a record of furnace, cycle, date and operatorCRITICALLoad thermocouple use is recorded where the spec requires itRecords link to the lot or work order and the certificateCRITICALOut-of-range alarms are logged with dispositionQuench delay and quench media records are kept where requiredHardness or test results are linked to the load recordRecords are retained for the contract or specification period

People and system controls

Operators are trained on pyrometry requirements and sign offProcedures reference the current revision of the specificationsCustomer flow-down requirements are logged by part numberAn internal audit of pyrometry records was done in the last 12 monthsCorrective actions from prior audits are closed with evidencePreventive maintenance covers burners, fans, seals and controllers

Mark each item when evidence exists, not when it is believed to exist. Items flagged as critical should be closed before an external audit. This checklist supports preparation and does not replace the governing specification or customer requirements.

Furnace due dates that block overdue work

Optional: we can review how calibration and survey due dates connect to work order release in your ERP.

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How to use it

Work through each group furnace by furnace, with the actual records in front of you rather than from memory. Tick an item only when you can show the document, chart or certificate. Items marked critical are those that most often lead to major findings. Print the checklist or export it to Excel to assign owners and due dates for open items. Repeat before each audit and after any major furnace repair or control change.

Check records, not recollection
Close critical items first
Assign an owner and date to each open item

What the standard is about

AMS2750 is the aerospace pyrometry specification, and customers and Nadcap use it to judge heat treat process control. In outline it classifies furnaces by uniformity and instrumentation type, then sets how often system accuracy tests (SAT) and temperature uniformity surveys (TUS) must be done, how sensors must be calibrated, and which records must be kept. The exact classes, tolerances and intervals are in the current edition and in each customer spec, so use the standard itself for the numbers. This checklist only checks that you have a defined, documented and followed system.

Furnace class and instrumentation type set the test intervals
SAT checks the control chain against a reference sensor
TUS maps temperature variation across the working zone

Common findings and ERP angle

Typical audit findings include overdue tests, a furnace used for a job that needs a tighter class than it holds, missing correction factors, sensors reused beyond limits and load records that do not tie to the certificate. Many of these are scheduling and data problems. Put furnace due dates into the maintenance or calibration module so work orders cannot be released to an out-of-date furnace, and link the load record to the lot so the certificate pulls the real cycle data.

Block scheduling on an overdue furnace test
Tie load records to lot and certificate
Track thermocouple reuse counts

Frequently Asked Questions

What does AMS2750 cover?

It is an aerospace specification for pyrometry in heat treatment. It covers furnace classes, instrumentation types, thermocouple calibration, system accuracy tests, temperature uniformity surveys and records. The current edition and customer flow-downs define exact tolerances and intervals.

What is the difference between SAT and TUS?

A system accuracy test compares the furnace control or recording sensor against a calibrated test sensor to check measurement error. A temperature uniformity survey places sensors across the working zone to measure how much temperature varies. Both have required intervals.

Is this checklist enough to pass a Nadcap audit?

No. It helps you prepare and find gaps. Passing depends on meeting the full specification, customer requirements and the audit criteria in force, plus having a working system with records that stand up to review.

How often should I run this checklist?

Run it before every external audit, after furnace repairs or controller changes, and at least once a year as part of internal audits. Some shops run it quarterly on the highest risk furnaces to catch overdue tests early.

If your furnace due dates, load records and certificates are kept in separate places, we can help link them in your ERP or maintenance system so overdue tests block work. This checklist is free and needs no sign-up.

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Heat Treat Pyrometry (AMS2750) Readiness Checklist