Figure 15-8.  Visual flight rule weather minimums.  no person may operate an aircraft beneath the ceiling under  VFR within the lateral boundaries of controlled airspace  designated to the surface for an airport when the ceiling is  less than 1,000 feet. Additional information can be found in  14 CFR part 91, section 91.155(c).  The safety of flight is a top priority of all pilots and the  responsibilities associated with operating an aircraft  should always be taken seriously. The air traffic system  maintains a high degree of safety and efficiency with strict  regulatory oversight of the FAA. Pilots fly in accordance  with regulations that have served the United States well, as  evidenced by the fact that the country has the safest aviation  system in the world.  All aircraft operating in today’s National Airspace System  (NAS) has complied with the CFR governing its certification  and maintenance; all pilots operating today have completed  rigorous pilot certification training and testing. Of equal  importance is the proper execution of preflight planning,  aeronautical decision-making (ADM) and risk management.  ADM involves a systematic approach to risk assessment  and stress management in aviation, illustrates how personal  attitudes can influence decision-making, and how those  attitudes can be modified to enhance safety in the flight  deck. More detailed information regarding ADM and  risk mitigation can be found in Chapter 2, “Aeronautical  Decision-Making.”  15-8  Operating Rules and Pilot/Equipment Requirements  Basic VFR Weather Minimums  Airspace  Flight Visibility  Distance from Clouds  Class  A  Not applicable  Not applicable  Class  B  3 statute miles  Clear of clouds  Class  C  3 statute miles  1,000 feet above  500 feet below  2,000 feet horizontal  Class  D  3 statute miles  1,000 feet above  500 feet below  2,000 feet horizontal  At or above  10,000 feet MSL  5 statute miles  1,000 feet above  1,000 feet below  1 statute mile horizontal  Class  E  Less than  3 statute miles  1,000 feet above  10,000 feet MSL  500 feet below  2,000 feet horizontal  Day, except as provided in section 91.155(b) 1,200 feet or less  1 statute mile  Clear of clouds  Night, except as provided in section 91.155(b) above the surface  (regardless of  MSL altitude).  3 statute miles  1,000 feet above  500 feet below  2,000 feet horizontal  Day  1 statute mile  1,000 feet above  More than 1,200  500 feet below  feet above the  2,000 feet horizontal  surface but less Class  G  Night than 10,000 feet  3 statute miles  1,000 feet above  MSL.  500 feet below  2,000 feet horizontal  More than 1,200  5 statute miles  1,000 feet above  feet above the  1,000 feet below  surface and at or  1 statute mile horizontal  above 10,000 feet  MSL. 