An outdoor storage bridge crane, when idle, must be equipped with which device?

An outdoor storage bridge crane, when idle, must be equipped with which device?

• A. Parking brake
• B. Rail clamp
• C. Either parking brake or rail clamp
• D. None of the above

Answer: (C)

An outdoor storage bridge crane must be immobilized when it’s not in use to prevent uncontrolled movement on the track. A parking brake accomplishes this by applying friction to the drive wheels, keeping the crane from rolling. A rail clamp achieves immobilization by gripping the track itself, locking the crane in place so it cannot travel along the runway. Because either method effectively stops movement, either device is acceptable for keeping the crane secure when idle. The key idea is to prevent movement due to wind, slope, or gravity while the crane is not operating.

An outdoor storage bridge crane must be immobilized when it’s not in use to prevent uncontrolled movement on the track. A parking brake accomplishes this by applying friction to the drive wheels, keeping the crane from rolling. A rail clamp achieves immobilization by gripping the track itself, locking the crane in place so it cannot travel along the runway. Because either method effectively stops movement, either device is acceptable for keeping the crane secure when idle. The key idea is to prevent movement due to wind, slope, or gravity while the crane is not operating.