How many personnel should typically be removed from the aerial ladder prior to lowering it?

The correct answer indicates that all personnel should be removed from the aerial ladder prior to lowering it to ensure maximum safety. When an aerial ladder is being lowered, having personnel on it could lead to serious accidents or injuries, particularly if the ladder is moved suddenly or if there are mechanical malfunctions during the lowering process.

Removing all personnel provides a clear and safe procedure, preventing potential falls and allowing the operator to focus on the mechanical operation of the ladder without the distraction or added risk of people still being on it. This protocol is essential in maintaining the safety of both those on the ladder and those below, as it minimizes the risk of accidents and ensures that the aerial device can be operated in a controlled manner.