Which of the following is necessary for safe operating conditions after assembly?

A functional test and visual inspection of all systems is essential for ensuring safe operating conditions after assembly. This process verifies not only the structural integrity of the assembly but also ensures that all components operate correctly and safely under expected conditions. A visual inspection can identify obvious defects or improper assembly, but it does not guarantee that all systems will function as intended.

By performing a functional test, one can validate that all systems—such as mechanical, electrical, and hydraulic—are operating within their specified parameters. This holistic approach minimizes the risk of failure during operation and enhances safety for both the operator and the equipment. A checklist review, while helpful for organization and thoroughness, may not replace the hands-on verification that a functional test provides. Similarly, self-verification by the assembler lacks an objective assessment from an independent party, which can create oversight issues.

In summary, combining both a functional test and a visual inspection provides the most comprehensive evaluation of the assembly, ensuring that all systems are safe and operational before use.