Can we talk about torque wrench calibration?

I've been using the same Snap-On torque wrench for 7 years in the hangar and never thought twice about it until last week when a senior mechanic checked it against his calibrated one and I was off by 8 ft-lbs on a 90 ft-lbs setting. Now I'm wondering if half the bolts I've torqued on engine mounts have been wrong this whole time. How often do you guys actually send your torque wrenches out for calibration?

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2 Comments

parkernelson4mo ago

Snap-On says every year but in aviation that's way too long. Every 6 months minimum on engine work, and get a dedicated calibration log for each wrench so you aren't guessing.

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thea_carter4mo ago

Six months, log everything, never guess.

4