Having a defined path all the time via RNP
This discussion is a good example why for modern air transport we ought to be flying RNP based procedures all the time, every time, IMC, VMC, day , night always. The paths are defined to be safe to the TDZ all the time, and even back out, in the event of a balked landing, even with an engine failure or first nav failure, and the training is always addressed, data bases are verified, and the vulnerability of Asiana 214's lack of having a safe well defined vertical path and seeing displacement from that path as being readily apparent to every on-board duty pilot goes away forever. Hopefully any remaining training concerns about using FMS visuals (until RNP based procedures are eventually implemented) will be soon addressed?