PSA: I was torquing those little Beechcraft fuel line fittings all wrong for months

I was working on a Baron 58 in Tulsa, and a senior mechanic saw me using a crowsfoot on a 1/4 inch fitting without doing the math for the added leverage. He just said, 'You know that's off by about 15 foot-pounds, right?' I had no idea. I'd been doing it that way since I got my A&P. Anyone have a good method or a cheat sheet they use for crowsfoot torque calculations?

3 comments

3 Comments

taylor.phoenix1mo ago

Keep a little laminated chart in your toolbox.

river1901mo ago

I've done the same thing with a cheat sheet for torque specs. Laminate it and tape it inside the lid of my tool chest and it's held up for years now.

the_daniel1mo ago

Beecraft fuel fittings are tiny and easy to strip if you're going by a chart that's off anyway. I've seen guys torquing those things by feel for years with no issues, and some of those planes have 10,000 hours on them without a leak. You're better off just getting a tiny torque wrench that maxes out at like 50 inch pounds and using it straight on the fitting. That chart in your toolbox won't help you when you're sweating in a tight wheel well and the crowsfoot is at a bad angle.