Parts manufactured for use on a specific operator's aircraft must comply with which condition?

The requirement that parts manufactured for use on a specific operator's aircraft must meet the original type design requirements is crucial for ensuring safety and airworthiness. This compliance verifies that the part adheres to the same standards and specifications as originally designed and certified by the aviation authority. Maintaining these standards helps to prevent failures that could arise from using parts that may not have been designed for the specific aircraft model or that might not integrate properly with existing systems.

Meeting the original type design requirements ensures that the characteristics, materials, and manufacturing processes align with what was initially approved during the aircraft’s certification. This is essential not just for safety but also for maintaining the reliability and performance expected from the aircraft, ultimately preserving the integrity of its operation.

The other options may reflect various aviation practices, but they do not encompass the essential regulatory requirement that ensures parts are appropriate for safe operation on specific aircraft.