When is it acceptable to operate the frame sway system?

The frame sway system is designed to enhance the stability and flexibility of a telehandler's load handling capabilities, particularly when the boom is elevated. It is crucial to operate this system correctly to maintain safety and control. The appropriate time to engage the frame sway system is never before the boom is elevated above horizontal because this ensures that the load is already at a higher and more stable position before any adjustments are made. Engaging the system while the boom is not elevated could lead to instability and an increased risk of tipping or losing control of the load, which is why the correct answer highlights the importance of proper elevation before the operation of the frame sway system. This helps prevent accidents and ensures that the telehandler operates safely and effectively.