talking of legal aspects I should mention RTFQ principle. Bus drivers among us should be familiar with the QRH content of chapter 4 Landing distance without autobrake. I really wonder why airbus puts a little note there saying The above distances are given for use in flight. Before departure refer to FCOM. Damn you airbus how dare you being illegal some of us cry out loud. RTFQ would be airbuses builders reply, I can imagine. Mind you airbus, unlike boeing, is written by lawyers not pilots and not for pilots. A very nice little brochure called getting to grips with performance will shed some light for those interested.
