Keeping a suspended platform within a small tolerance of level is essential for stability and safety. When the platform is level, the weight of the worker and any tools stays as close as possible to the center of gravity of the platform together with its load. This reduces lateral forces on the suspension lines and minimizes the chance of tipping or swaying that could cause a fall or sudden movement when the crane hoists, lowers, or moves the platform. The specific requirement of staying within 10 degrees of level means you won’t have a steep tilt that would push you toward the edge, change the load path, or compromise fall protection equipment. If the platform tipped more than this, the load could shift unpredictably, increasing the risk of the platform rotating, the lines going slack or unevenly loaded, and the worker being exposed to a higher fall potential. In practice, you check the level with a suitable level once the platform is rigged and before lifting. If you can’t bring it within 10 degrees of level, you must adjust the rigging or composition of the lines until the surface is essentially horizontal, then proceed with lift only when that condition is met. So, the best practice is to keep the platform within 10 degrees of level.