What should be regularly inspected to prevent line twist during jumps?

The packing procedure of the parachute is crucial in preventing line twist during jumps because it ensures that the lines and the canopy are organized and positioned correctly within the deployment bag. If the parachute is not packed properly, it can lead to uneven openings or snags that result in line twists once the canopy deploys. Proper packing techniques, such as appropriately stowing the lines and ensuring that the canopy is folded and placed in a way that promotes a clean deployment, can significantly minimize the risk of line twists occurring upon opening.

While the other factors, such as the pilot chute deployment method, line stowing technique, and the jumper's body position during freefall, can contribute to the overall safety and performance during a jump, they are not the primary means of ensuring the parachute opens without twists. Regularly inspecting and refining the packing procedure is essential for maintaining the integrity of the parachute system and ensuring a safe and predictable deployment.