B737-400
Flight Crew Air Transport Pilot (ATP)
Troubleshooting; Time Pressure; Distraction; Workload
Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Became Reoriented
Environment - Non Weather Related; Procedure; Weather
Two highly experienced pilots on second leg of a 5-leg day. Had just done an aircraft swap for a 15 minute flight in marginal weather conditions. Pushed back from gate and de-iced. Just as we were starting our first engine; ATC advised us of a 15 minute delay awaiting the arrival of an inbound aircraft (non-radar environment). We elected to use our company's single engine taxi-out procedure. Almost immediately; ATC advised that there would be no delay if we 'keep things moving.'  Started second engine; taxied; and departed.  As soon as we were airborne; my ears told me something might be amiss with the cabin pressurization. Sure enough; some pressurization panel switches were not in the normal positions.  Corrected and continued.First time with a 5-leg day in years. (Have been flying mostly turns).  First time to de-ice this season. First time to use revised de-icing procedures. First time for me to fly in a high workload; non-radar area of our route system in a couple of years. First time for me to use single engine taxi-out procedure in at least a year. As a crew; we had discussed these issues and how the 'Swiss cheese holes could line up'. Bottom line was we allowed interruptions; changes of plans; and a desire to 'keep the operation moving' to get in the way of not completely finishing the after start flow and checklist.  We even talked about a 'safety  pause'; but obviously didn't pause enough.
A B737 crew took off unpressurized because they were rushed to takeoff after de-icing; planning a single engine taxi; and then were suddenly released for takeoff before they were ready.