EASA Design – Sub part J
The company carries EASA design-Subpart J approvals. H4 Aerospace senior engineering team hold EASA CVE status covering both mechanical and electrical disciplines.
DOA Approval = EASA.21J.087
Link to EASA STC listing = EASA. STC list.pdf
FAA and other certification authorities
The company over the years has established good working relationships and has been involved on many certified programmes with other worldwide aviation authorities in its task to design and approve a modification etc.