That time at O'Hare last winter changed my torque sequence for good

I was working a night shift on a 737 brake job at O'Hare back in February. A senior mechanic walked over and showed me a different pattern for the axle nut torque sequence, and I haven't had a single re-torque call since. Anybody else pick up a trick from an old head mid-job that stuck with you?

2 comments

2 Comments

hugo_craig11d ago

Did that old timer show you the "three tightens and a back-off" method? I picked that up from a United vet at Newark years ago, and it saved me a ton of headaches on those older 737 axles. The trick was he had me mark the nut and the axle with a paint pen after the first torque, then do the final step with the socket backed off a quarter turn to seat the threads right. Haven't had a single nut spin loose since I started doing that.

ellis.rose11d ago

Hold up, you really think a quarter turn back-off is what's making that nut stay put? I mean, I get the whole thread seating idea, but that sounds more like a superstition than actual engineering. I've torqued plenty of axles on all kinds of planes and never had a nut spin loose just because I didn't mark it with a paint pen. Feels like you're adding extra steps that aren't really solving a problem that exists in the first place. Maybe your torque wrench was just off before and you were over-tightening stuff. Honestly, I think people overthink this stuff and just need to follow the manual as written.