B737NG centre tank ground transfer
Recently a fueler made an error fueling my aircraft. He proceeded to put 700kgs in the centre tank and 2500kgs in each main tank when we had asked for 5700kgs block fuel. This was in breach of the airframe limitation which requires the wings tanks to be full if there is more than 453kgs in the centre tanks. As we were at an outstation with no engineering support the easiest solution I could find was to fill the main tanks. As I work for an airline that monitors the carriage of "excess" fuel, that is fuel carried above the flight plan fuel, a report was submitted by me explaining the situation. My Chief Pilot reponded in an a sympathetic manner however he noted that there is a method to transfer fuel from the centre tank to the mains on the ground using the defuel valve. I can't find any reference to this, and I probably wouldn't have gotten involved with it without it being demonstrated but imam just curious if there is a way to do this and how long it would take to transfer 700kgs?