Published date: 4 April 2019


This Advisory Circular (AC) describes an acceptable means of compliance with Civil Aviation Rule Part 43 General Maintenance Rules and Part 21 Certification of Products when applying for approval of and/or embodying modifications and repairs.

This material is intended for those persons wishing to have technical data approved and to perform modifications and repairs.

Related rules

This AC relates specifically to Part 43 Subpart E, and Part 21 Subpart C, Subpart M, and Subpart N.

Change notice

Revision 4 adds guidance on approved model list (AML) supplemental type certificates (STCs) under section 4 of this AC; and updates the title of Appendix A of this AC.

Cancellation notice

This AC cancels AC43-9 Rev.3 dated 11 November 2013.