Before using an inertial real system, always test the locking mechanism by giving it a sharp pull. Some models fit on the back of the harness , but this makes the harness heavier and more awkward for the crewmember. The main disadvantage of an inertial real is the lack of freedom provided to the wearer.

This text describes safety precautions and drawbacks associated with using an inertial reel system, likely a type of safety harness used in industrial settings or potentially aviation. Let's break down the points:* **"Before using an inertial reel system, always test the locking mechanism by giving it a sharp pull."** This is a crucial safety instruction. A sharp pull simulates a sudden fall or jerk, ensuring the locking mechanism functions correctly and will arrest a fall. Failure to test could result in serious injury.* **"Some models fit on the back of the harness but this makes the harness heavier and more awkward for the crewmember."** This highlights a design consideration and trade-off. While mounting the inertial reel on the back might seem convenient in some ways, it adds weight and reduces the wearer's comfort and maneuverability. This suggests a potential need for lighter and more ergonomically designed models.* **"The main disadvantage of an inertial reel is the lack of freedom provided to the wearer."** This points to the primary limitation of the system. The safety mechanism, designed to prevent falls, restricts the wearer's movement compared to a system with more slack or freedom of movement. This trade-off between safety and freedom of movement is a key design challenge for inertial reel systems.In summary, the text provides important information regarding the safe operation and limitations of inertial reel systems. The emphasis on safety testing and the acknowledgment of the trade-off between safety and freedom of movement are key takeaways.