BUT WHY default is LRC and not Vmd?
well thnx @piltdown tht ws helpful...@vilas that is precisely my query why not Vmd which gives the "maximum" range. Why is default speed LRC not MRC? as range is the worst affected flight parameter after an engine failure...any other deviation called for by the peculiarities of specific contingencies could then have been accounted for from thereon( i.e.from MRC)...also why is max distance from adequate aerodrome in terms of time not distance? whts the role of time here?