(ii) A 1,000 ft buffer is provided betwe(ii) A 1,000 ft buffer is provided between the nominal aircraft position and an airspace boundary set at a useable IFR level;

(ii) A 1,000 ft buffer is provided between the nominal aircraft position and an airspace boundary set at a useable IFR level;

except for precision approaches where, in addition, the basic ILS surfaces must be wholly contained within the controlled airspace boundary;