What is the procedure if a driver needs to lower a defective panto manually?

Using a crank handle is the appropriate procedure for manually lowering a defective pantograph (panto). A crank handle provides the mechanical advantage needed to safely manipulate the pantograph, allowing for controlled lowering without risking further damage to the equipment or creating safety hazards on the track. This method is straightforward and is designed to be used in situations where automatic operation fails, ensuring that personnel can carry out the procedure effectively.

Other methods, like pressing the emergency stop button, would be more suitable for halting operations rather than specifically for adjusting the pantograph. Notifying the control center, while important for communication about the defect, does not address the immediate need to lower the pantograph safely. Using the manual control panel could be effective under certain circumstances, but it might not be available or functional in cases where a defect has rendered the pantograph unusable. The crank handle method is thus the most universally applicable and safe approach for this situation.