Originally Posted by
H Peacock
LRC parameters are usually, by definition, not the best way to get maximum range. The LRC data invariably has a bias to slightly increase IAS by a corresponding small reduction in range. ie, you save a bit of time at the expense of a slightly higher fuel burn.
Wind velocity also clearly plays a part.
If you really do want to achieve maximum range you have to fly at an IAS that corresponds to minimising: (Fuel Flow)/GS
LRC is the maximum range cruise profile available in the flight planning section of the performance manuals. I'm not about to delve more deeply than that for the sake of a PPRuNe thread.