Hot take: is the 'tight is right' rule actually causing more hangar rash than loose tolerances?

My old lead mechanic argued last week that torquing everything to the high end of spec prevents vibration failures, but after a 737 nacelle door hinge cracked on an overnight check, I started wondering if that extra 3 foot-pounds is what killed it - anyone else seen this go both ways?

2 comments

2 Comments

quinnmitchell4d ago

That extra 3 foot-pounds on a hinge that's already seeing cyclic loading from door operations is a classic case of good intentions going sideways. I've seen torque values on nacelle door hinges creep up over time as mechanics chase "feel" over spec, and the stress risers don't care about your precision. Maybe the real problem isn't tight or loose but inconsistent application across the fleet.

wren2173d ago

Feel that. Inconsistency kills more hardware than a few foot-pounds ever will.