Switzerland-based aviation maintenance and completion services firm Amac Aerospace has been granted Boeing 747-400 and 747-8 Part 145 approval, meaning that it can now provide base and line maintenance services on these types. The Boeing approvals come on the heels of Amac Aerospace gaining its European EASA Part 145 approval to undertake heavy base maintenance on the Boeing 777 and Airbus A330 and A340.