Here is a very interesting video shows how an Airbus A330 is converted from passenger plane to a cargo plane. There are lots of changes or modifications were made to the airplane to fit the new requirement as a cargo airplane, including removing the passenger seats, strengthening the floors, change the windows and the doors, and many more.
So, what I want to know are:
- Is such that changes require recertification?
- Is that conversion is not breached manufacturer right which there is stated that only the manufacturer can do repairing, modification, and so on?