B733 FLT CREW FAILED TO MONITOR THE XFEED OF FUEL TO CORRECT A MINOR IMBAL. WHEN DISCOVERED THE IMBAL HAD GONE TO 3000 LBS IN THE OPPOSITE DIRECTION. LANDED WITH 2000 LB IMBAL IN EXCESS OF PUBLISHED MAX ALLOWABLE.

Narrative

ABOUT 1 HR INTO THE FLT; I BEGAN TO XFEED TO CORRECT A 150 LB IMBAL. I PUNCHED OFF THE MASTER CAUTION LIGHT AND DID NOT MENTION THE XFEED OP TO THE FO. I PROMPTLY WAS DISTR AND FORGOT THE XFEED. APPROX 50 MINS PASSED BEFORE I NOTICED IT AGAIN; RESULTING IN A 3000 LB IMBAL. WE WERE ABOUT 50 MI FROM DSCNT INTO PDX. I BEGAN CORRECTING THE IMBAL; WE CONFIGURED EARLY; BUT WE LANDED WITH A 2000 LB IMBAL. I CALLED MAINT CTL TO SEE IF I NEEDED ANY MAINT ACTION; THEY SAID NO. I PROCEEDED WITH THE NEXT LEG. LESSONS I LEARNED/RELEARNED: 1) COMMUNICATE WHAT I'M DOING; EVEN 'LITTLE' THINGS WITH THE FO SO HE CAN BACK ME UP. 2) AT THE FIRST SIGN OF A DISTR; DISCONTINUE XFEED OPS. 3) PUNCHING OFF THE MASTER CAUTION FOR XFEED IS PROBABLY A POOR TECHNIQUE -- IT REMOVES A REMINDER FOR ME AND THE FO. 4) ALWAYS HAVE A BACKUP REMINDER. 5) I SHOULD HAVE MODIFIED THE ARR (DONE A 360 DEG TURN OR DONE EXTENDED DOWNWIND) TO GET THE FUEL THE REST OF THE WAY INTO BAL. I WAS TOO CONSCIOUS OF ARR FLOW. SUPPLEMENTAL INFO FROM ACN 586007: AFTER FLYING WITH THE CAPT THE ENTIRE MONTH THE COM BTWN US WAS EXCELLENT. I AM NOT SURE WHEN THE CAPT STARTED THE XFEEDING OF FUEL. IN RETROSPECT I NEED TO EXPAND MY OVERHEAD PANEL SCAN IN CRUISE OTHER THAN TEMP AND PRESSURIZATION TO ENSURE THIS SIT NEVER HAPPENS AGAIN. AND I ALSO NEED TO ENSURE WHEN COMING BACK FROM GIVING A PA OR OBTAINING ATIS THAT NO CHANGES MEANS NO CHANGES AT ALL; IE; ACFT OR COM CHANGES.