DAE notice new guys torque in one pass instead of crisscross?

Had a kid on a 737 brake job at our MSP hangar last month run every bolt down to spec in a straight line, one right after the other, and the wheel half came back with a slight warp. The manual wants a crisscross pattern in stages for a reason, it spreads the load so the flange doesn't pull to one side. I've been doing it star pattern since my A&P days and never cooked a wheel. Am I crazy or is this just not getting taught in school anymore?

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henrys746d ago

Been seeing this more and more with the newer guys, schools drill the torque value but skip right over the sequence. The star pattern isn't just a suggestion, it walks the load around the flange so nothing pulls hard to one side while the metal is still settling. A single pass front to back on a big wheel is asking for a warp, and that kid just learned it the hard way.

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