What is the main consideration when inspecting fastener installations?

The main consideration when inspecting fastener installations is compliance with engineering requirements. This focus is crucial because the integrity and safety of the entire assembly rely on fasteners being installed correctly according to the specified engineering standards. Engineering requirements dictate the correct type of fasteners to use, the required torque, and the installation procedures necessary to ensure that the fasteners perform effectively under operational conditions.

Non-compliance with these specifications can lead to failures that might compromise the safety and functionality of aircraft components. For instance, improperly installed or inadequate fasteners could result in structural failures, leaks, or catastrophic failures during operation. Thus, ensuring that fastener installations are in strict compliance with engineering requirements is paramount for maintaining the aircraft's safety and reliability.

Aspects like cost efficiency, time taken, and raw materials used, while important in the broader context of aerospace manufacturing and assembly, do not take precedence over meeting the critical engineering specifications that ensure the security and stability of the assembly.