737-700 landing distance
Standard zero wind approach speed is Vref+5. This is held until retarding thrust levers to flare. If you want to know your landing distance on a dry runway, you enter QRH, PI 12.1. You find e.g. 790 meters for a dry runway, max manual braking, flaps are 40 according to notes on bottom. In table below you have adjustments for the landing distance. My question is: Should you make adjustmens to the landing distance because you approach with Vref+5 and the adjustment-table states "approach speed" "per 10 kts above Vref" or is the table based on you flying Vref+5 and hence no adjustment is necessary? If the latter is the case, what if you fly with Vref+20 due to gust?