Flight Crew Last 90 Days 100; Flight Crew Total 11000; Flight Crew Type 6000
Other / Unknown
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented
Human Factors; Procedure
Wrong Dispatch Release; arrived in operations about 1 hour 10 minutes before departure and Company flight plan (release 1) had already been printed by station personnel. After review; the Captain called the Dispatcher to clarify his dispatch remarks about optimum altitudes en route. While the Captain was signing and printing the release; I stepped to the aircraft to start the exterior inspection. Cockpit setup was not rushed. During push-back we received final weights which didn't quite make sense. TOW had increased from Rel 1; but the line TOW CHANGE indicated minus 1;900 LBS. We dismissed the minus as an error by Load Planning; thinking it should be a plus. We got new takeoff data for the final takeoff weight and completed our departure. Later in the flight; we realized Load Planning had not made an error; there was a release 2 for zero fuel weight increase. The final weights reflected 1;900 LBS less than Release 2. In hindsight; the Captain probably signed release 2; but both our copies of the flight plan were release 1. Route verification procedures were accomplished with Release 1 without us realizing it was not current. Departure time was [after midnight] Domicile time. Circadian cycle/fatigue was possibly a factor.
First Officer reports departing on an ETOPS flight using Release 1 with amended takeoff weights; to discover enroute that the amended weights were for Release 2. Fortunately the route had not changed.