What is the function of the turntable in an aerial apparatus?

• A. It provides emergency braking.
• B. It stores hydraulic fluid for rotation.
• C. It allows the upper structure to rotate, enabling alignment with the target; must be locked when stationary.
• D. It powers the vehicle's engine.

Answer: (C)

The turntable is the rotary joint that lets the upper aerial structure rotate independently from the vehicle chassis, so the operator can aim the platform toward the target without moving the truck. It’s driven by the hydraulic system and can be locked when stationary to hold the platform in position for safe operation. This prevents unwanted movement, maintains alignment in wind or during lifting, and keeps the load stable. It isn’t about braking the vehicle, storing hydraulic fluid, or powering the engine.