How many trained persons are required for loading and unloading the counterweight fly system?

• A. Two trained persons on stage.
• B. One trained person.
• C. At least three trained persons: two on the loading gallery and one supervisor on stage.
• D. Four trained persons all on stage.

Answer: (A)

In loading and unloading a counterweight fly system, the key safety principle is that there must be reliable, hands-on control with immediate backup. Having two trained persons on stage ensures there is always a second set of eyes and hands to manage the moving weights, operate the necessary locks and pins, and communicate clearly with the fly operator. This setup provides the redundancy needed to stop or adjust things quickly if something looks off, such as a weight catching on a frame or a miscount in the weights. The two-person arrangement keeps the operation coordinated and visible to everyone involved, reducing the chance of a sudden, uncontrolled move that could injure someone or damage gear. A single trained person lacks that redundancy and would be at higher risk if a problem arose. Having more than two on stage isn’t required for the basic safety standard and can create unnecessary crowding; two on stage is the practical minimum to maintain safe, controlled loading and unloading.