A B767ER FLT DEPARTS WITH AN ILLEGAL FUEL DISTRIBUTION PROB WHEN THE R CTR TANK BOOST PUMP IS MEL'ED AFTER LEAVING THE GATE FOR AN EXTENDED OVERWATER OP AT LHR.

Narrative

ON TAXI TO RWY 27L WE NOTICED AN EICAS MESSAGE INDICATING THE CTR R FUEL BOOST PUMP WAS INOP. WE NOTIFIED GND THAT WE WOULD NEED TO PARK THE ACFT AND DISCUSS THIS WITH OUR MAINT. AFTER A SHORT TIME IN DISCUSSION WITH MAINT; WE BROUGHT DISPATCH INTO THE DISCUSSION. WE CONSIDERED THE POSSIBILITY OF NOT BEING ABLE TO XFER THE FUEL AND THAT WE WOULD KNOW THIS WELL BEFORE COASTING OUT OVER THE ATLANTIC OCEAN. AFTER LOOKING AT THE FLT MANUAL AND CONSIDERING ALL THAT MAINT AND DISPATCH HAD TO ADD; WE UNDERSTOOD THAT WE COULD DEPART AFTER RECEIVING THE MEL PLACARDED INFO. WE WAITED FOR THE INFO OVER THE ACARS AND READ THE CONSTRAINTS ASSOCIATED WITH THE BOOST PUMP SWITCHES. THIS INDICATED THAT WE WERE GOOD TO GO. WE THEN TOOK OFF ON RWY 27L. AFTER A FEW MINS; WE RECEIVED A CALL FROM DISPATCH INFORMING US OF THE ILLEGAL DISPATCH. AFTER THIS EVENT; WE ARE SUBMITTING A LIST OF CONSIDERATIONS TO BE PLACED IN THE FLT MANUAL UNDER THIS IRREGULARITY. I AM NOT CERTAIN THAT THIS WILL BE ADDED; HOWEVER; I WILL HAVE IT AS PART OF MY OWN BOOK OF THINGS TO CONSIDER. SUPPLEMENTAL INFO FROM ACN 519303: R OVERRIDE PUMP CIRCUIT BREAKER POPPED WHILE TAXIING. CALLED MAINT ON SAT. HE SAID WE COULD NOT RESET. HE GOT DISPATCH ON THE LINE AND WE BEGAN DISCUSSING DEFERRAL OPTIONS. WE MISSED THE REQUIREMENT THAT ACTUAL ZERO FUEL WT PLUS CTR FUEL MUST BE LESS THAN MAX ZERO FUEL WT. WE WERE CALLED ON TKOF ROLL AS SOMEONE CAUGHT THE MISTAKE BUT TOO LATE TO STOP. WE WERE 7000 LBS OVER THE MAX ZERO FUEL WT WITH THE CTR FUEL ADDED. GOOD CRM OTHER THAN NO ONE CAUGHT THE MISSED REQUIREMENT.