Repair Station Tool Calibration Tracking: What the Rules Require and What Actually Works
Walk any shop floor with an inspector and you can predict the first move: they pick up a torque wrench, read the cal sticker, and ask to see the record behind it. If the answer starts with "let me find the spreadsheet," the tone of the whole visit changes. Repair station tool calibration tracking is one of the easiest things to get right on paper and one of the most common places shops take findings, because the tracking system is usually a spreadsheet that was accurate the day someone built it and has drifted ever since.
What the rules actually require
Two pieces of Part 145 do most of the work here. 14 CFR 145.109 requires the repair station to have the equipment and tools necessary to perform its work, and test and inspection equipment must be calibrated to a standard acceptable to the FAA, which in practice means traceable to NIST, another national standard, or the equipment manufacturer's standard. 14 CFR 145.211 requires your quality control manual to spell out your calibration procedures, including the intervals at which each piece of equipment gets calibrated.
Read that second part again, because it is where findings come from: the FAA holds you to the intervals and procedures written in your own manual. If your QCM says 12 months and the sticker says 14, the gap is the finding. As always, your Repair Station Manual, Quality Control Manual, and ops specs govern; nothing here is legal advice, and your PMI's interpretation is the one that counts.
What a real tracking system contains
Whether you run it on software or a clipboard, the system needs the same bones:
- A master tool list. Every calibrated tool and piece of test equipment, with an ID that matches the physical item. If it can make an airworthiness determination, it is on the list.
- Current cal data per tool. Date calibrated, date due, cert number, and who performed it, with the cert retrievable, not just referenced.
- Traceability. An unbroken documentation chain from the tool through any intermediate standards to the acceptable standard. The cal lab's cert usually carries this; your job is to keep it attached to the right tool.
- Due and overdue flags that fire early. The system should surface tools coming due before the inspector finds one that already is. A list you have to remember to check is not a flag.
- An out-of-service process. Overdue or suspect tools get tagged and pulled from the floor, and the record shows it.
- Personally owned tools. If your manual allows techs to use their own calibrated tools on customer aircraft, those tools follow the same tracking, same intervals, same certs.
The findings inspectors keep writing
The pattern repeats across shops: an overdue micrometer still sitting in a drawer on the floor, a cal cert nobody can produce for a tool that signed off a job last month, a tech's personal torque wrench with no record at all, and intervals in the QCM that quietly stopped matching what the cal lab actually does. None of these mean the shop does bad work. They mean the evidence is scattered, which is the same disease that makes Part 145 audit prep eat a week instead of an afternoon.
Where the work order system fits
Calibration records do not live alone. When an inspector pulls a closed work order, the questions chain together: who signed it, what parts went on, and were the tools used in calibration on the date of the work. Shops that keep work orders, discrepancy records, and signatures in one system, the way Orion does with its signed records, audit trail, and SHA-256 tamper hashes, spend the audit answering questions instead of excavating for documents. Orion is modular, so a shop can configure exactly the pieces it needs on published pricing, with the compliance core included in every base plan and unlimited users.
If your calibration tracking still lives in a spreadsheet nobody fully trusts, schedule a call and we will talk through how shops organize compliance records in one system.