How to keep contact with EASA approved Production Organisations? What is expected from DOA on top of providing mail address and establishing a DO/PO agreement?
The DOA is expected to be in contact with the POA producing parts for the STC in case of multiple installations. Example could be metallic/composite structure for antenna installations.
It is obvious that the POA must inform the DOA in case of quality escapes etc. while the DOA must keep the POA informed if approved production drawings are changed.