H&H performed the mechanical and electrical inspection and developed the condition reports for the seven ferry slip terminals that accommodate the Staten Island Ferries, connecting Staten Island to Lower Manhattan. The three ferry slips are located in Manhattan, and four are located on Staten Island side. Each slip consists of a lower bridge to moor the ship and transfer authorized vehicular traffic to the lower deck of the ferry and two upper bridges to transfer pedestrian traffic from the waiting area of the terminal to the upper deck of the ship.
The operating machinery for each bridge consists of a complex system of operating ropes, sheaves, and gear-driven machinery located at the gallows tower of the ferry terminals. The bridges are connected to counterbalance weights that travel within enclosed tower legs to support the gallows tower. The system has several safety features in case certain critical machinery components fail, including brakes, self-locking gears, and safety chains.