Why must assembly procedures always follow the manufacturer's specifications?

Assembly procedures must always align with the manufacturer's specifications to guarantee safety, performance, and airworthiness of the aircraft. Adhering to these guidelines ensures that components are assembled correctly and functioning as intended, which is critical for the operational integrity of the aircraft. The manufacturer designs these specifications based on extensive testing and engineering principles that account for the various forces and stresses the aircraft will encounter.

Following these procedures not only helps in maintaining the safety of the aircraft but also ensures that it meets performance standards necessary for efficient operation. This is particularly crucial as any deviation from the manufacturer's guidelines could lead to malfunctions or failures that could jeopardize the safety of the aircraft and its passengers. Moreover, ensuring compliance with these specifications is key to maintaining the airworthiness certification of the aircraft, which is mandatory for legal operation in any jurisdiction.

While factors like minimizing maintenance costs and maximizing assembly speed are important in the overall consideration of assembly processes, they should never compromise adherence to the manufacturer's established guidelines, as safety and performance are always the top priorities in aviation.