Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Other / Unknown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Landed As Precaution; Flight Crew Overcame Equipment Problem; Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Procedure; Human Factors
Top Clam shell of cabin door opened on takeoff.Cause - Cabin door not secured properly? Did not notice if door warning.
Cessna 402 pilot reported the upper clamshell door half opened after takeoff.