A flight crew reported a 'tank #2 fuel qty low'; followed by a 'tank #3 fuel qty low' and suspected ...

Narrative:

Approximately 90 miles due north of the airport we got a 'tank #2 fuel qty low' warning on our system display. Approximately 39 miles from the airport we received a 'tank #3 fuel qty low' warning light. We had an uneventful landing in day VFR conditions with 4;000 kilos of fuel. Flight planned landing fuel was 5;745 kilos. We noticed enroute that our expected fuel at a couple of our waypoint fixes was less than flight planned. We suspected either fuel gauge indication problems or a fuel leak. We had an issue on the previous leg where we received a level 2 'fuel qty/used check' indication that also indicated that we might have a fuel leak issue. The problem eventually resolve itself and the alert went away. The problem ended up being dispatch and our paperwork showing 'planned payload of 6 tons' instead of the actual payload of 92;900 tons. This 'mistake' went unnoticed by myself and two other crewmembers. Our previous leg landed with approximately 89;092 tons and were only stopping for 2 tons of fuel and a stack of pallets (approximately 5 tons). We expected very little change on the next leg.crew fatigue was a probable issue since all three of us slept very little the day of the flight and flew an 'all nighter' landing after sunrise in the morning before resuming this flight.

Original NASA ASRS Text

Title: A flight crew reported a 'TANK #2 FUEL QTY LOW'; followed by a 'TANK #3 FUEL QTY LOW' and suspected a fuel leak. They later discovered a dispatch weight and balance error listed the payload at six tons instead of the actual 92;900 tons.

Narrative: Approximately 90 miles due north of the airport we got a 'TANK #2 FUEL QTY LOW' warning on our system display. Approximately 39 miles from the airport we received a 'TANK #3 FUEL QTY LOW' warning light. We had an uneventful landing in day VFR conditions with 4;000 kilos of fuel. Flight planned landing fuel was 5;745 kilos. We noticed enroute that our expected fuel at a couple of our waypoint fixes was less than flight planned. We suspected either fuel gauge indication problems or a fuel leak. We had an issue on the previous leg where we received a level 2 'FUEL QTY/USED CHECK' indication that also indicated that we might have a fuel leak issue. The problem eventually resolve itself and the alert went away. The problem ended up being Dispatch and our paperwork showing 'planned payload of 6 tons' instead of the actual payload of 92;900 tons. This 'mistake' went unnoticed by myself and two other crewmembers. Our previous leg landed with approximately 89;092 tons and were only stopping for 2 tons of fuel and a stack of pallets (approximately 5 tons). We expected very little change on the next leg.Crew fatigue was a probable issue since all three of us slept very little the day of the flight and flew an 'all nighter' landing after sunrise in the morning before resuming this flight.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1259328
Time
Date	201504
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Heavy Transport
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 103 Flight Crew Total 13157 Flight Crew Type 4046
Events
Anomaly	Deviation - Procedural Published Material / Policy Deviation - Procedural Weight And Balance Inflight Event / Encounter Fuel Issue

A flight crew reported a 'tank #2 fuel qty low'; followed by a 'tank #3 fuel qty low' and suspected a fuel leak. They later discovered a dispatch weight and balance error listed the payload at six tons instead of the actual 92;900 tons.