Why aren flare tube fittings and hose fittings safety wired?
My thoughts are that in order to get the fittings sealed, they require an amount of torque that can’t be overcome by vibration. I have wondered about this question myself. Some military planes safety the fittings, but most planes do not. Apparently, it is not a problem, or it would be required. There are details of homebuilding and links to more homebuilders’ sites on my RV-7A builder’s web page: http://brian76.mystarband.net/RV-7Ahome.