A B727-200 WAS DISPATCHED IN NON COMPLIANCE WITHOUT AMENDED RELEASE INDICATING CORRECT ACFT WT.

Narrative

ATTEMPTED TO START #3 DURING PUSHBACK. 10A IGNITION START CIRCUIT BREAKER TRIPPED. COMPLETED QRC ANDREF ITEMS. TRIED SECOND START PER REF CHKLIST; AND CIRCUIT BREAKER TRIPPED AGAIN. SPOKE WITH MAINT AND WAS TOLD TO TOW BACK TO GATE FOR CONTRACT MECH. CONTRACT MECH SHOWED UP AROUND XA00. WE TRIED A START ON #3 AT THE GATE; AND THE CIRCUIT BREAKER DID NOT TRIP -- GOOD START. WE SHUT DOWN AND REFUELED. WE THEN STARTED #3 AT THE GATE WITH MECH ON BOARD AND GOT ANOTHER GOOD START. WE CONTACTED MAINT; FILLED OUT THE PAPERWORK; AND THE MECH DEPARTED THE ACFT. WE THEN PUSHED BACK AND STARTED THE REMAINING ENGS; TAXIED TO RWY 15 AND DEPARTED AFTER RUNNING ALL REQUIRED CHKLISTS. AFTER DEP; WE REALIZED THAT WE DID NOT OBTAIN NEW TKOF WTS (LOST 2 PAX). TOOK OFF WITH NUMBERS FROM CARD; AND WE WEIGHED 160300 LBS. PRIMARY CAUSE OF THE ERROR: 1) WE HAD PREVIOUSLY OBTAINED WTS (MIND SET); BUT THE FE DID NOT WRITE THEM DOWN DUE TO PULL BACK TO BLOCKS; 2) NEW WTS WERE NOT XMITTED BY OPS; AND 3) WE FAILED TO QUERY OPS WHEN THE NEW WTS DID NOT APPEAR.