PSA: Hit my 10,000th torque wrench calibration check and it was on a C-130 rudder bolt

I work at a base in Oklahoma and we do monthly torque checks on every wrench in the hangar. Last Wednesday I pulled out my old clicker and the reading was 8 foot-pounds off from the standard. Turns out I had been under-torquing rudder bolts on a C-130 for about 60 flights before the night shift caught it on a routine inspection. Nobody got hurt but it scared me enough to double-check every calibration log now. Has anyone else had a close call like this from a simple tool drift?

3 comments

3 Comments

alice_allen55d agoMost Upvoted

Hold up, was this the same clicker you'd been using for all of those 60 flights or had it been rotated out between checks? I'm curious if the drift showed up gradually or just suddenly jumped off the mark, because that kind of thing makes a big difference for how you set up your future maintenance schedule.

troychen5d ago

And you're saying that's the whole story, but then you gotta wonder if someone didn't just reset the thing mid-flight without logging it, because that would totally throw off any drift pattern you thought you were tracking. I've seen that happen where a crew swaps out a tool to keep running and nobody bothers to note the serial number change until way later, then all of a sudden you're blaming a gradual creep that was actually just a fresh unit with different baseline error. The whole "was it rotated" question cuts to the heart of whether you can trust the data at all or if you're just guessing at a pattern that doesn't exist yet. If nobody can confirm it wasn't swapped, then building a maintenance schedule off that sixty-flight stretch feels like building a house on sand.

wright.leo5d ago

Bet on it being gradual, that kind of creep is way more common than a sudden jump in my experience. Idk maybe it's just me but I'd lean into catching it early so you can map out a real schedule for when those adjustments actually start hitting.