Heavy Transport
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 103; Flight Crew Total 13157; Flight Crew Type 4046
Troubleshooting; Human-Machine Interface; Fatigue; Confusion; Distraction
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance; Inflight Event / Encounter Fuel Issue
General None Reported / Taken
Human Factors; Procedure; Chart Or Publication
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.
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.