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 CAA

CAA ORS9 Decision No. 1

STCs, major changes and major repairs issued by a DOA holder under their privilege of point 21.A.263(c)(5), (8) and (9) should each be given a unique and consecutive reference number.

The following numbering system may be considered:

DOA holder reference	Type of certificate	Year of approval	Dash	Sequential number	Issue reference
21Jxxx	STC or MCH or MRE	17	—	001	A

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 the CAA in a timely manner (as agreed with the CAA).