B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 240; Flight Crew Total 25000; Flight Crew Type 18000
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft; Human Factors
1L door failed to seal; causing air return due to failed pressurization. Leveled 10;000 feet and seal did not seat. Returned to departure airport uneventfully. Found door closed; but seal not seated.
A B737 1L door seal did not seat properly and therefore the aircraft could not pressurize. The flight returned to the departure airport.