B757 Undifferentiated or Other Model
Confusion; Troubleshooting
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance; Inflight Event / Encounter Other / Unknown
Flight Crew Took Evasive Action
Chart Or Publication; Procedure
The weight and balance uploaded gave data for a full power flaps 5 take off on Runway 31R. The aircraft required nearly all of the 12;467 FT runway. At rotation the aircraft hesitated before a reluctant lift off. The acceleration and climb were very slow and we maintained TO power beyond the NADP1 reduction altitude of 1;500 FT until 2;000 FT. The rate of climb was as slow as 300 FT per minute. The First Officer did an excellent job of flying the aircraft and responding to input. After climbing to a safe altitude and speed we checked several things and found no crew errors regarding configuration or power settings; so we began to narrow the problem down to either one of two things: Take Off Data or erroneous Cargo Data. Flaps 5 data is not the norm in Bogotá; but the acceleration on the runway took a long time. Very long.
We departed [Runway] 31R in SKBO; weight and balance was given for a flaps 5 takeoff. The weight and balance showed us with the correct ZFW compared to the flight planned weights and the aircraft was about 2;500 LBS from max takeoff weight. Upon rotation the aircraft did not perform as expected we had a rate of climb of less than 500 FPM at times. Performing a noise abatement procedure at 1;500 AGL when the power was retracted and the climb rate was reduced further the aircraft was slow to accelerate to retract the flaps. The Captain and I felt that if we had an engine failure we would not be able to climb. We otherwise had an uneventful flight.My concern is that; either; the weight and balance data was wrong and we needed a flaps 15 takeoff or flaps 5 with packs off (something different) or there was more weight in the cargo bins than reported. Reaching cruise altitude we went to review the performance data and realized our flight 5 data was missing. SKBO Operations gave us the paper work at the gate and already had it ripped into sections for us this may have been the reason we did not get that data as it may have been left behind prior to us receiving it. We sent a message to Dispatch advising them of the situation and they notified the Flight Ops Manager; Load Planning and sent all info to engineering for further review. They also had the destination airport audit all bags and cargo upon arrival.
A B757 required the entire BOG (SKBO) runway length for takeoff so the crew suspected a weight and balance error.