When would data in aircraft maintenance manuals be considered approved data?

Data in aircraft maintenance manuals is considered approved when the manufacturer explicitly assigns its approval to the manual or its specific parts. This is essential because manufacturers are responsible for the design and production of aircraft and their components. When they produce a maintenance manual that they certify as approved, it implies that the information has gone through rigorous design and testing processes and complies with regulatory standards. This approval ensures that the maintenance practices outlined in the manual are safe and effective for maintaining the aircraft.

The concept of manufacturer approval is crucial as it streamlines the maintenance process and provides a reliable basis for technicians to perform necessary tasks on aircraft with confidence that the data has been vetted. While manuals can undergo further review by regulatory bodies or be referenced in a supplemental type certificate, it is the manufacturer's decisive approval that ensures its status as approved data.