This application allows you to calculate ACN number for your aircraft. Application also includes PCN references. / You can easily check ACN PCN compatibility before each flight by using this application! Application includes all aircraft types in use with following information: All-up Mass (Maximum Apron Mass) (lbs) Operating Mass Empty (lbs) All-up Mass (Maximum Apron Mass) (kg) Operating Mass Empty (kg) Load on one main gear leg (%) Standard Aircraft Tire Pressure Rigid Pavement Subgrades A-High K = 150 MN/m3 B-Medium K = 80 MN/m3 C-Low K = 40 MN/m3 D-Ultralow K = 20 MN/m3 Flexible Pavement Subgrades A-High CBR = 15% B-Medium CBR = 10% C-Low CBR = 6% D-Very low CBR = 3%