Incident Overview
While climbing to cruise altitude at approximately 4,000 feet mean sea level, the pilot heard a whistling noise and noticed that the crew door adjacent to his seat was not completely secured. As he attempted to properly secure the door, it came open, yanking his left arm outside the aircraft. The airstream forced his arm backwards against the door frame, resulting in a broken arm.
Pilot Actions and Outcome
The pilot advised air traffic control of his situation and received vectors back to his departure point. He subsequently made a successful landing. No other factual details about the aircraft, its registration, or the pilot's identity are provided in the source.
Reported Injuries and Damage
The pilot's left arm was broken. No damage to the aircraft or injuries to any other persons are mentioned in the source.