This AC provides a means acceptable to the Director for showing compliance with Part 21 to gain a supplemental type certificate (STC).
The guidelines provided in this AC are general in nature and intended to help applicants and design organisations gain a better understanding of the STC process including their respective roles and responsibilities.
This AC relates specifically to Civil Aviation Rule Part 21, Subpart E, Supplemental Type Certificates.
Revision 4 updates contact details, removes specific form numbers, and updates throughout to standardise and align with current AC format.
Note: as the excel tables in the two Appendices may be difficult to cut and paste from a PDF document, they are available here:
AC21-8, Design Changes - Supplemental Type Certificate, Appendix A, Revision 3 [XLSX 12 KB]
AC21-8, Design Changes - Supplemental Type Certificate, Appendix B, Revision 3 [XLSX 28 KB]
Please note, if you use the template matrix in Appendix B, it is important that you do not alter the format of the matrix, as it allows for clear identification of acceptable MOCs compared to selected MOCs for the project.
