Everything on the engine seems to be safety wired (or otherwise retained by lock nuts, lock washers, thread lockers, etc). Everything except fuel and oil line AN fittings...not even on the lines that are subject to constant relative movement and vibrations such as on the fuel line between the firewall bulkhead fitting and the engine fuel pump (or alike). No safety wire, no thread locker, no provision for any retention device whatsoever.
So, those AN fittings never get loose?
So, those AN fittings never get loose?