An air carrier flight crew flying a B737 from mco notices a mathematical discrepancy in their actual aircraft weight and that stated on the load manifest.

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Attributes
ACN	457300
Time
Date	199912
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mco.airport
State Reference	FL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 240 flight time total : 5600 flight time type : 240
ASRS Report	457300
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 270 flight time total : 10100 flight time type : 6000
ASRS Report	457307
Events
Anomaly	non adherence : company policies other anomaly other
Independent Detector	other flight crewa other flight crewb other other : load planner
Resolutory Action	other
Supplementary
Problem Areas	Company
Primary Problem	Company

Narrative:

Upon taxiing out to the runway, crew noticed arithmetic error on load sheet resulting in a 10000 pound difference in weight. Performance data was computed for revised weight prior to takeoff. On climb out, mco operations called to inform us of the error. Having been unable to successful reach us, the math error was caught and corrected prior to takeoff.

Original NASA ASRS Text

Title: AN ACR FLC FLYING A B737 FROM MCO NOTICES A MATHEMATICAL DISCREPANCY IN THEIR ACTUAL ACFT WT AND THAT STATED ON THE LOAD MANIFEST.

Narrative: UPON TAXIING OUT TO THE RWY, CREW NOTICED ARITHMETIC ERROR ON LOAD SHEET RESULTING IN A 10000 LB DIFFERENCE IN WT. PERFORMANCE DATA WAS COMPUTED FOR REVISED WT PRIOR TO TKOF. ON CLBOUT, MCO OPS CALLED TO INFORM US OF THE ERROR. HAVING BEEN UNABLE TO SUCCESSFUL REACH US, THE MATH ERROR WAS CAUGHT AND CORRECTED PRIOR TO TKOF.

Data retrieved from NASA's ASRS site as of July 2007 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.