| Obviously they need to start somewhere making performance calculations and that is the dry runway in normal conditions. Wet or contaminated runways require corrections.
If you need to do corrections on "dry figures" yourself depends on the situation. In my company we have separate charts for wet conditions. No need to do corrections yourself. For sure these figures are derived from the dry data (with corrections) but someone else did the work for us. When we have a contaminated situations we need to do these things ourselves. Starting point is dry figures (maybe that is what the book means?) |