Torque tool calibration guide
This guide is for tooling and quality engineers who control torque tools in a hangar. It covers calibration certificates, in-service checks and calibration hierarchies, citing Norbar documentation and FAA AC 43.13-1B.
Calibration certificates
- Norbar torque wrenches ship with ISO 6789-2 calibration certificates [1].
- Accredited calibration (for example UKAS-accredited) gives traceability for audits [2].
In-service checks
- Line-side testers such as Norbar TruCheck give a quick confidence check between calibrations [3].
- Data-management testers such as T-Box XL record results [3].
Calibration hierarchy
- Some airlines run their own torque calibration using beam-and-weight master systems [3].
- Fastener torque values come from the aircraft or engine manual; FAA AC 43.13-1B gives general practices [4].
Restricted-access fasteners
- Where a standard wrench cannot reach, engineer-to-order fittings such as a cranked ring spanner kit can be specified [3].
- Any adapter changes the effective length, so record the adapter with the wrench in the tool control system and follow the manufacturer's instructions for setting torque with it.
Building a tool-control routine
- Assign each wrench a unique ID and recall date taken from its calibration certificate [1].
- Run a line-side confidence check before critical tasks and quarantine any tool that fails it [3].
Manufacturer referenced in this guide
Norbar
Norbar Torque Tools manufactures torque wrenches, torque measurement instruments and calibration equipment used by aircraft manufacturers, airlines and space programmes for controlled tightening of fasteners…
Torque & Controlled TighteningCalibration & MetrologyAircraft Maintenance Tools
Related category
Torque & Controlled Tightening · All aviation guides
Frequently asked questions
Which standard covers torque wrench calibration?
ISO 6789-2, cited on Norbar certificates [1].
Is a confidence check a calibration?
No. A line-side check confirms the tool is still in range between formal calibrations [3].
This guide is general information. It does not replace the aircraft maintenance manual, the operator's approved procedures or the rules of the competent civil aviation authority.
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