Narrative:

Flight was delayed twice to add more passenger. We were on rls 3 when we finally were released by operations; our zero fuel weight had gone up with each new release due to adding of passenger. We blocked out 18 mins late (XA13); however; we had to wait 16 mins to receive our final weights. We had sent messages to load planning about needing our weights. Finally we received our weights with a load of 10/146 lap 2. Zero fuel weight was 170329 pounds. This was below our zero fuel weight forecast; so we input the information and launched at XA29Z. At XB42 en route at cruise; we received a message saying that our passenger count was 21/158 lap 2; not 10/146 and I would confirm. I had the flight attendants do a manual count (which is not required before pushback anymore) and they confirmed that the passenger count was 21/158 lap 2. I forwarded the information to load planning and they sent me a revised final weight manifest with a zero fuel weight now of 174727 pounds! We were 4400 pounds heavier at takeoff than what we originally been told. We had done a reduced thrust takeoff based on the lighter numbers. This is unsettling to say the least. We are not to have the flight attendants do a manual count due to their errors; however; this is the second time I have received revised weights after departure due to errors on load planning's part. Where is the check and balance in the new system? How am I to trust load planning? On a hot summer's day in den; an error of this type could be catastrophic. This makes me want to do a maximum thrust takeoff since I cannot trust load planning to get me the right information.

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Original NASA ASRS Text

Title: A B757-200 FLT CREW LEARNED 1 HR AFTER TKOF THAT THE ACFT WAS 4400 LBS HEAVIER THAN THE WT MANIFEST SHOWED.

Narrative: FLT WAS DELAYED TWICE TO ADD MORE PAX. WE WERE ON RLS 3 WHEN WE FINALLY WERE RELEASED BY OPS; OUR ZERO FUEL WT HAD GONE UP WITH EACH NEW RELEASE DUE TO ADDING OF PAX. WE BLOCKED OUT 18 MINS LATE (XA13); HOWEVER; WE HAD TO WAIT 16 MINS TO RECEIVE OUR FINAL WTS. WE HAD SENT MESSAGES TO LOAD PLANNING ABOUT NEEDING OUR WTS. FINALLY WE RECEIVED OUR WTS WITH A LOAD OF 10/146 LAP 2. ZERO FUEL WT WAS 170329 LBS. THIS WAS BELOW OUR ZERO FUEL WT FORECAST; SO WE INPUT THE INFO AND LAUNCHED AT XA29Z. AT XB42 ENRTE AT CRUISE; WE RECEIVED A MESSAGE SAYING THAT OUR PAX COUNT WAS 21/158 LAP 2; NOT 10/146 AND I WOULD CONFIRM. I HAD THE FLT ATTENDANTS DO A MANUAL COUNT (WHICH IS NOT REQUIRED BEFORE PUSHBACK ANYMORE) AND THEY CONFIRMED THAT THE PAX COUNT WAS 21/158 LAP 2. I FORWARDED THE INFO TO LOAD PLANNING AND THEY SENT ME A REVISED FINAL WT MANIFEST WITH A ZERO FUEL WT NOW OF 174727 LBS! WE WERE 4400 LBS HEAVIER AT TKOF THAN WHAT WE ORIGINALLY BEEN TOLD. WE HAD DONE A REDUCED THRUST TKOF BASED ON THE LIGHTER NUMBERS. THIS IS UNSETTLING TO SAY THE LEAST. WE ARE NOT TO HAVE THE FLT ATTENDANTS DO A MANUAL COUNT DUE TO THEIR ERRORS; HOWEVER; THIS IS THE SECOND TIME I HAVE RECEIVED REVISED WTS AFTER DEP DUE TO ERRORS ON LOAD PLANNING'S PART. WHERE IS THE CHK AND BAL IN THE NEW SYS? HOW AM I TO TRUST LOAD PLANNING? ON A HOT SUMMER'S DAY IN DEN; AN ERROR OF THIS TYPE COULD BE CATASTROPHIC. THIS MAKES ME WANT TO DO A MAX THRUST TKOF SINCE I CANNOT TRUST LOAD PLANNING TO GET ME THE RIGHT INFO.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.