The control register is the reality check
Ask most maintenance organisations what tool control means and you will hear '145.A.40(b) — calibration.' That is true but too narrow. The tooling control obligation is spread across several provisions, and the AMC guidance makes the practical expectation explicit: a clear labelling system and a control register for precision tooling, with a record of calibrations and the standards used.
The control register is where the regulation stops being abstract. It tracks tools per part number — description, control classification, reference instruction, servicing and calibration intervals — and per serial number: where the item lives (workshop, line station, hangar, line maintenance) and what its status is. For an organisation spread across several workshops, line stations, and hangars, EASA's own guidance says a database should be expected.
Separate concepts, not one status column
The hardest part of a register is that the facts do not collapse into a single field. A tool can be serviceable but checked out. It can be owned by one company yet stored in a shared warehouse. It can be physically present but blocked because calibration expired. Serviceability, calibration validity, custody, ownership, and location are different questions that need to be tracked separately — and then recombined to answer where it is, whether it is valid, who holds it, and when it will be ready again.
Serviceability monitoring is a control, not a reminder
The AMC calls for a labelling system showing the next inspection, servicing, or calibration due date, and unserviceable status. A spreadsheet can warn that calibration is approaching; it cannot reliably stop the tool going out. The decisive control happens when a mechanic tries to issue the tool: an expired calibration-controlled item must not leave the store, full stop.
That is the only-we invariant in Aviamatic's design: expired calibrated tools cannot be issued, including by supervisor override. The correct measurement standard — the manufacturer's recommendations, or ISO 10012 where none — drives the interval, and calibration is performed by laboratories accredited to ISO/IEC 17025 by an ILAC-MRA signatory, traceable to national or international standards.
The incumbent is the manual status quo
The real competitor is not a broad MRO platform — it is the spreading spreadsheet, the token board, the paper logbook. Those tools carry no complete record of location, status, and calibration provenance, and answering an auditor's question means reconstructing a day from screenshots and memory.
Aviamatic operationalises the register EASA expects: per-serial-number location and status across the approved scope, calibration records and traceability in one auditable place, and append-only audit events so an auditor's question is answered in minutes rather than days.
An honest boundary
We keep the evidence; we do not replace the authority. Aviamatic is not the regulator, does not certify, does not perform calibration, and does not write or approve your MOE. Your approved data, the 145.A.70(a) exposition procedures (2.4 acceptance, 2.5 calibration, 2.6 use of tooling), and airworthiness decisions stay with your organisation. Our job is the trusted, auditable record that supports them.