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Warning: stop torqueing hydraulic lines to the book spec
Last week I was doing a 300 hour inspection on a King Air and my lead told me to torque the hydraulic lines to feel instead of the chart, which went against everything I was taught in A&P school. I argued with him for 10 minutes until he showed me the maintenance manual for that specific fitting, which called for 20 percent less than the standard table I had memorized. Turns out the standard torque charts in the back of the AC 43.13 don't account for the softer aluminum fittings on older airframes, and over-torquing causes hairline cracks that won't show up until they leak on a customer. I've been doing this 11 years and just now learned to check the specific manual instead of trusting the general chart. Anybody else run into this on older Beechcraft or is it just me?
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