When a new aircraft is introduced into airline service, it must have a maintenance and inspection program approved by the Federal Aviation Administration (FAA).
The “Airline/Manufacturer Maintenance Program Planning Document,” commonly known as MSG-3, is a method used (by the airlines and manufacturers) to develop the necessary maintenance/inspection program.
The FAA participates with the manufacturer and airlines in the development of the program and finally, the FAA Maintenance Review Board (MRB) reviews the program, accepts it, and publishes it in an MRB report.
This process is started early in the development of the new aircraft, well before the first flight, and concluded prior to delivery of the first aircraft.