Crew is unable to modify and correct outdated takeoff data supplied by dispatch.

Attributes
ACN	1068710
Time
Date	201302
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 140 Flight Crew Total 23500 Flight Crew Type 3000
Person 2
Function	Relief Pilot First Officer
Experience	Flight Crew Last 90 Days 225 Flight Crew Total 14500 Flight Crew Type 3700
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

Dispatch had 1 hour (3439 lbs) of taxi fuel on board the aircraft due to snow and de-ice. When the fuel sheet got to the cockpit we had an extra 500 lbs of fuel over requested. We deiced at the remote parking spot. If we could have taxied straight forward we were less than 500 feet from the departure runway. During deicing it became obvious that we would weight about 514.0 for takeoff; and we had received our final weights showing a takeoff weight of 510.5. We were unable to override this takeoff weight to get V speeds for a 514.0 take-off weight.we had to get dispatch to give us the numbers for wet runway; anti-ice on; and 514.0 weight. Crews should be able to override the takeoff weight to get correct numbers. Does this mean that any time we have not burned the complete taxi fuel we are not legal for takeoff?

Original NASA ASRS Text

Title: Crew is unable to modify and correct outdated takeoff data supplied by Dispatch.

Narrative: Dispatch had 1 hour (3439 lbs) of taxi fuel on board the aircraft due to snow and de-ice. When the fuel sheet got to the cockpit we had an extra 500 lbs of fuel over requested. We deiced at the remote parking spot. If we could have taxied straight forward we were less than 500 feet from the departure runway. During deicing it became obvious that we would weight about 514.0 for takeoff; and we had received our final weights showing a takeoff weight of 510.5. We were unable to override this takeoff weight to get V speeds for a 514.0 take-off weight.We had to get Dispatch to give us the numbers for wet runway; anti-ice on; and 514.0 weight. Crews should be able to override the takeoff weight to get correct numbers. Does this mean that any time we have not burned the complete taxi fuel we are not legal for takeoff?

Data retrieved from NASA's ASRS site as of July 2013 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.