Narrative:

On taxi out; we received our weights in a timely manner. However; about 5 mins before takeoff; we received a message from center load planning stating; 'the station was revised their final load plan. Your current weights are now invalid.' about 2 mins before takeoff; we received the final weights. I noticed the change in zero fuel weight and all other numbers were the same. After the new zero fuel weight was entered and briefed; we took off. Out of approximately 500 ft; I noticed the message light flashing on the ACARS. At a safe altitude; I read the message which read; 'please call tower for hazmat information.' climbing out of FL180; we called ramp tower. The frequency was scratchy; so we had ramp tower relay the information through dispatch via ACARS. After reviewing the paperwork; our second weight manifest did have the 'dangerous goods -- yes' note at the bottom. I believe numerous factors caused us to miss this note. First; the ground crew never told us hazmat was loaded on the aircraft. Second; we were advised by control load planning that we were receiving a new manifest because of new cargo weight. No mention by them of dangerous goods being put on the aircraft. Third; the cockpit was dark. Lastly; since I was only expecting new numbers on the final manifest; I didn't read the note on the bottom.

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Original NASA ASRS Text

Title: A B737-300 PLT RPTS THAT AFTER TKOF A WT AND BAL CHANGE WAS RECEIVED WHICH CHANGED WTS AND ADDED A HAZMAT CARGO NOTIFICATION.

Narrative: ON TAXI OUT; WE RECEIVED OUR WTS IN A TIMELY MANNER. HOWEVER; ABOUT 5 MINS BEFORE TKOF; WE RECEIVED A MESSAGE FROM CTR LOAD PLANNING STATING; 'THE STATION WAS REVISED THEIR FINAL LOAD PLAN. YOUR CURRENT WTS ARE NOW INVALID.' ABOUT 2 MINS BEFORE TKOF; WE RECEIVED THE FINAL WTS. I NOTICED THE CHANGE IN ZERO FUEL WT AND ALL OTHER NUMBERS WERE THE SAME. AFTER THE NEW ZERO FUEL WT WAS ENTERED AND BRIEFED; WE TOOK OFF. OUT OF APPROX 500 FT; I NOTICED THE MESSAGE LIGHT FLASHING ON THE ACARS. AT A SAFE ALT; I READ THE MESSAGE WHICH READ; 'PLEASE CALL TWR FOR HAZMAT INFO.' CLBING OUT OF FL180; WE CALLED RAMP TWR. THE FREQ WAS SCRATCHY; SO WE HAD RAMP TWR RELAY THE INFO THROUGH DISPATCH VIA ACARS. AFTER REVIEWING THE PAPERWORK; OUR SECOND WT MANIFEST DID HAVE THE 'DANGEROUS GOODS -- YES' NOTE AT THE BOTTOM. I BELIEVE NUMEROUS FACTORS CAUSED US TO MISS THIS NOTE. FIRST; THE GND CREW NEVER TOLD US HAZMAT WAS LOADED ON THE ACFT. SECOND; WE WERE ADVISED BY CTL LOAD PLANNING THAT WE WERE RECEIVING A NEW MANIFEST BECAUSE OF NEW CARGO WT. NO MENTION BY THEM OF DANGEROUS GOODS BEING PUT ON THE ACFT. THIRD; THE COCKPIT WAS DARK. LASTLY; SINCE I WAS ONLY EXPECTING NEW NUMBERS ON THE FINAL MANIFEST; I DIDN'T READ THE NOTE ON THE BOTTOM.

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.