A new cycle has been created to publish the CS for hot-air airships, thus making related standards available to support the implementation of Part 21 Light. EASA has certified hot-air airships in the past by means of special conditions. The related special condition, and in particular the certification basis of EASA.AS.002, was based on the German airworthiness requirements for hot-air airships (Lufttüchtigkeitsforderungen für Heißluft-Luftschiffe (LFHLLS)). The new CS-31HA are intended to be drafted based on the technical content of LFHLLS and considering the format and style of the CS for gas balloons, hot-air balloons and tethered gas balloons (CS 31GB, CS-31HB and CS-31TGB).