on may 10, 2010, ntsb inspectors attempted to replicate the problem with the pilothouse controls. because the vessel was docked during the testing, the units were tested without the engines running. hydraulic pressure to the units was supplied by electric standby pumps, which limited the maximum attainable pitch command to 75%. when a full ahead pitch command was input from either pilothouse, both units responded normally. when a neutral pitch command was then input, the staten island end propulsion unit responded normally to the command, while the new york end unit remained locked at 75% thrust. when control was subsequently transferred to the engine room, both propulsion units responded normally to commands.