Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Type 3000
Situational Awareness; Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport; Flight Crew Landed As Precaution; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft; Procedure
While I was cruising about 60 Miles off ZZZ and 120 Miles to ZZZ1; I saw the Door Warning light just came on; I knew it was from the crew hatch so I tried to re-lock it tight but the crew hatch just came off and opened but still attached with the aircraft. So; I called [Operations Control] and returned to ZZZ. I safely landed back to ZZZ on Runway XXR. Nobody got hurt or injury and everyone seem pretty good.Knowing crew hatch was not fully locked and trying to relock. While I try to tighten the Open and Lock red switch and the D ring the crew hatch was opened in Cruise. I noticed that the D ring is kind of loose and easy to unlock on Aircraft X. Better judgment and decision of fix the problem later fly the airplane as always. Knowing what it is will making you wanna fix the problem. Also having hard day of flying long flight back to back will make your decision poor and not thinking a lot.
C-402 Captain reported the crew emergency escape hatch opened in flight resulting in an Air Turn Back..