What are strips of metal or wood that guide a fly section as it is being extended called?

The correct term for the strips of metal or wood that guide a fly section as it is being extended is "guides." These guides are crucial for the proper functioning of equipment such as aerial ladders or extension ladders, as they ensure that the sections move smoothly and align correctly as they are extended or retracted.

Having well-designed guides promotes safety and efficiency in ladder operations, helping to prevent binding or misalignment that could lead to malfunctions. In the context of firefighting, identifying terminology accurately is vital for ensuring effective communication among team members and adhering to safety protocols during operations.

Other options do not specifically describe the function of guides in this context. While braces and supports relate to stability and reinforcement, they do not perform the specific role of guiding the movement of ladder sections. The choice "guiding strips" might seem appropriate, but "guides" is the more recognized term within fire service vocabulary. Understanding this terminology allows firefighters to better comprehend the design and operation of the equipment they use.