B737 Undifferentiated or Other Model
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 22
Time Pressure
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
We received a preliminary dangerous good print out after we initialized ACARS.  Then about 10-15 minutes to punch we received another preliminary dangerous goods printout that added more dry ice.  I looked at this saw the addition of the ice and my expectation bias led me to believe that it was the Final dangerous goods printout.  We taxied and waited for our weight and balance numbers.  When our final weights came the final dangerous goods also printed out and I said; 'Why did we get another Final dangerous goods report.'  I then looked at the two reports I had and realized they were both preliminary reports.
DG (Dangerous Goods) planning sheet arrived XA:52 at gate XX. We received the second sheet XB:07. Thought it was final with addition of dry ice. pushed XB:24. Final weights and Final dg sheet 23:36. We confirmed proper paperwork then continued.
B737 flight crew reported pushback from gate prior to receiving Final Dangerous Goods report.