B757 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 130; Flight Crew Total 5982; Flight Crew Type 988
Human-Machine Interface; Other / Unknown
Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance; Flight Deck / Cabin / Aircraft Event Other / Unknown
Flight Crew Became Reoriented
Human Factors
I used the flight planned estimated TOW to print up a preliminary runway data sheet. Then; when the real numbers were uploaded from load planning I mistakenly typed in the zero fuel weight where I should have typed TOW and requested numbers for a departure. We set the bad numbers in our speed bugs and took off with the wrong speed and weight. TOW was around 252k; zero fuel weight was around 177k. The captain realized the speeds were wrong after I called out '100 kts' and accelerated down the runway a bit until the airplane climbed out. We were beyond V1 as bugged; but probably below the real V1 (but we didn't know what that number was).
A B-757 First Officer mistakenly typed in the zero fuel weight where he should have typed takeoff weight and requested takeoff numbers for that lower weight. On takeoff; when the First Officer called 100 knots; the Captain realized the numbers were wrong and delayed rotation until further down the runway.