GM 21.A.263(c)(5), (8) and (9) Numbering system for supplemental type certificates (STCs), major changes and major repairs issued by design organisation approval (DOA) holders, and information to EASA

• ED Decision 2019/018/R found in: Initial Airworthiness and Environmental Protection (748/2012) Part-21 Part-21L (Jul 2024)

GM 21.A.263(c)(5), (8) and (9) Numbering system for supplemental type certificates (STCs), major changes and major repairs issued by design organisation approval (DOA) holders, and information to EASA ED Decision 2019/018/R STCs, major changes and major repairs issued by a DOA holder under their privilege of point [21.A.263](#_DxCrossRefBm1649096918)(c)(5), (8) and (9) should each be given a unique and consecutive reference number. The following numbering system may be considered: <table border="1" cellpadding="0" cellspacing="0" width="606"> <tr> <td width="95"> <p><b>DOA holder reference</b></p> </td> <td width="122"> <p><b>Type of certificate</b></p> </td> <td width="97"> <p><b>Year of approval</b></p> </td> <td width="97"> <p><b>Dash</b></p> </td> <td width="97"> <p><b>Sequential number</b></p> </td> <td width="97"> <p><b>Issue reference</b></p> </td> </tr> <tr> <td width="95"> <p>21Jxxx</p> </td> <td width="122"> <p>STC or MCH or MRE</p> </td> <td width="97"> <p>17</p> </td> <td width="97"> <p>—</p> </td> <td width="97"> <p>001</p> </td> <td width="97"> <p>A</p> </td> </tr> </table> Example: 21J999STC17—001A Note: ‘MCH’ refers to ‘major changes’, ‘MRE’ to ‘major repairs’. With reference to STCs only, after the STC approval, the DOA holder should send a copy of the STC to EASA in a timely manner (as agreed with EASA). ##### GM 21.A.263(c)(5), (8) and (9) Numbering system for supplemental type certificates (STCs), major changes and major repairs issued by design organisation approval (DOA) holders, and information to EASA *ED Decision 2019/018/R* STCs, major changes and major repairs issued by a DOA holder under their privilege of point [21.A.263](#_DxCrossRefBm485230409)(c)(5), (8) and (9) should each be given a unique and consecutive reference number. The following numbering system may be considered: <table bgcolor="#d9d9d9" cellpadding="7" cellspacing="0"> <col/> <col/> <col/> <col/> <col/> <col/> <tr> <td bgcolor="#808080"><p align="center"> <b>DOA holder reference</b></p> </td> <td bgcolor="#808080"><p align="center"> <b>Type of certificate</b></p> </td> <td bgcolor="#808080"><p align="center"> <b>Year of approval</b></p> </td> <td bgcolor="#808080"><p align="center"> <b>Dash</b></p> </td> <td bgcolor="#808080"><p align="center"> <b>Sequential number</b></p> </td> <td bgcolor="#808080"><p align="center"> <b>Issue reference</b></p> </td> </tr> <tr> <td bgcolor="#d9d9d9"><p align="center"> 21Jxxx</p> </td> <td bgcolor="#d9d9d9"><p align="center"> STC or MCH or MRE</p> </td> <td bgcolor="#d9d9d9"><p align="center"> 17</p> </td> <td bgcolor="#d9d9d9"><p align="center"> —</p> </td> <td bgcolor="#d9d9d9"><p align="center"> 001</p> </td> <td bgcolor="#d9d9d9"><p align="center"> A</p> </td> </tr> </table> Example: 21J999STC17—001A Note: ‘MCH’ refers to ‘major changes’, ‘MRE’ to ‘major repairs’. With reference to STCs only, after the STC approval, the DOA holder should send a copy of the STC to EASA in a timely manner (as agreed with EASA).