These special conditions are issued for Ultramagic S.A. Models M-56, M-56C, M-65, M-65C, M-77, M-77C, M-90, M-105, M-120, M-130, M- 145, M-160, N-180, N-210, N-250, N-300, N-355, N-425, S-70, S-90, S- 105, S-130, S-160, T-150, T-180, T-210, V-56, V-65, V-77, V-90, and V- 105 balloons. These balloons will have novel or unusual design features associated with a standard construction basket with a singular distribution that includes four occupant seats and a lower sidewall. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for these design features. These special conditions contain the additional safety standards the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.