Which of the following checks is NOT part of the five-point harness system?

The five-point harness system is designed to securely restrain a passenger, particularly in aviation or certain transportation contexts, to enhance safety. The correct answer highlights an aspect that is not specifically a part of the five-point harness system checks.

When creating a secure harness system, each strap plays a crucial role in ensuring that a passenger remains safely in their seat. The five-point harness includes two shoulder straps, two leg straps, and one waist strap, which collectively work to distribute the forces during potential impact evenly across the body.

While fastening the waist strap is essential for overall harness functionality, it is not typically emphasized as a distinct check in the context of systematically ensuring the proper function and fit of the harness. Instead, the focus is often on the adjustments and checks of the more critical components involved in securing the passenger—like the leg straps, shoulder straps, and sternum strap—because these directly impact the effectiveness and comfort of the overall harness system.

Thus, while every component should be secured ultimately for full safety, the process of fitting and adjusting the shoulder and leg straps, as well as checking the sternum strap, is more critical during the initial setup and check before use.