B737-300 takes off with data based on zero fuel weight vice actual takeoff gross weight.

Attributes
ACN	674001
Time
Date	200510
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : geg.airport
State Reference	WA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 200 flight time total : 5000 flight time type : 200
ASRS Report	674001
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 123
ASRS Report	674004
Events
Anomaly	aircraft equipment problem : less severe non adherence : far other anomaly
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Company Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

Opc was inoperative. When arriving at aircraft; I called dispatch and gave him all of the requested data. I heard him ask for weight and I gave him out zero fuel weight because this is the first item that is entered after the ATOG; which he did not ask for. He verified the information I had given him; including ATIS and load sheet information. I read out loud the information he gave me as he was giving it to me and the captain and I both copied down. On takeoff; I had to pull more back stick than I usually do. The plane took up more runway than we had expected. Takeoff was otherwise normal. I questioned the stabilizer trim setting and we then took the opc out which needed to charge and now was working. We determined that dispatch entered in the zero fuel weight into the takeoff weight position. After discussing this with dispatch on the ground; they told us that they don't need the zero fuel weight; just the takeoff weight. I was under the impression that our opc programs were the same and needed the same information. In the future; I will make sure that both the dispatcher and myself are using the correct numbers in the correct places in the program.

Original NASA ASRS Text

Title: B737-300 TAKES OFF WITH DATA BASED ON ZERO FUEL WT VICE ACTUAL TKOF GROSS WT.

Narrative: OPC WAS INOP. WHEN ARRIVING AT ACFT; I CALLED DISPATCH AND GAVE HIM ALL OF THE REQUESTED DATA. I HEARD HIM ASK FOR WT AND I GAVE HIM OUT ZERO FUEL WT BECAUSE THIS IS THE FIRST ITEM THAT IS ENTERED AFTER THE ATOG; WHICH HE DID NOT ASK FOR. HE VERIFIED THE INFO I HAD GIVEN HIM; INCLUDING ATIS AND LOAD SHEET INFO. I READ OUT LOUD THE INFO HE GAVE ME AS HE WAS GIVING IT TO ME AND THE CAPT AND I BOTH COPIED DOWN. ON TKOF; I HAD TO PULL MORE BACK STICK THAN I USUALLY DO. THE PLANE TOOK UP MORE RWY THAN WE HAD EXPECTED. TKOF WAS OTHERWISE NORMAL. I QUESTIONED THE STABILIZER TRIM SETTING AND WE THEN TOOK THE OPC OUT WHICH NEEDED TO CHARGE AND NOW WAS WORKING. WE DETERMINED THAT DISPATCH ENTERED IN THE ZERO FUEL WT INTO THE TKOF WT POS. AFTER DISCUSSING THIS WITH DISPATCH ON THE GND; THEY TOLD US THAT THEY DON'T NEED THE ZERO FUEL WT; JUST THE TKOF WT. I WAS UNDER THE IMPRESSION THAT OUR OPC PROGRAMS WERE THE SAME AND NEEDED THE SAME INFO. IN THE FUTURE; I WILL MAKE SURE THAT BOTH THE DISPATCHER AND MYSELF ARE USING THE CORRECT NUMBERS IN THE CORRECT PLACES IN THE PROGRAM.

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.