What action should be taken if a good canopy is turning during descent?

When faced with a situation where a good canopy is turning during descent, the appropriate action is to pump the rear risers or steering controls. This technique is effective because it allows the parachutist to counteract the turn and stabilize the canopy. By manipulating the rear risers or the steering toggles, the jumper can apply input that might realign the parachute and correct its flight path.

This approach is essential in managing the canopy's performance, ensuring the parachutist stays in a controlled descent and avoids any potential issues that could arise from a disorienting turn. Proper use of these control inputs can also help maintain a safe landing trajectory.

In contrast, cutting away the main canopy is not advisable since the parachute is functioning correctly and does not require emergency measures. Releasing the harness to freefall would be dangerous, as it eliminates any control over the descent and significantly increases the risk of injury. Lastly, holding still and waiting for stabilization does not actively address the issue of the turning canopy and may lead to further instability or complications during descent. Therefore, the best course of action is to actively manage the canopy's performance through rear riser or steering control manipulation.