Incident Summary
A pilot reported that while descending to land, the cargo door opened and struck the side of the fuselage, resulting in substantial damage to the airframe.
Pilot Report
The pilot stated that he thought he had latched and locked the door properly before departing on the accident flight. However, when the door opened during descent, he realized that he had not latched or locked it correctly.
Postaccident Inspection
A postaccident inspection of the cargo door and its locking mechanism revealed no evidence of any preimpact mechanical anomalies. The door and locking system were found to be functioning normally after the event.