1. A simple and safe takeoff or landing procedure with wing surface contaminations
2. 4Gregory, N., and O'Reilly, C. L. "Low-Speed Aerodynamic Characteristics of NACA-0012 Aerofoil Section, Including the Effects of Upper-Surface Roughness Simulating Hoar Frost," NPL Aero Report 1308, Ames Research Center (NASA);British Aeronautical Research Council31719,Jan. 1970.