What happened
On the morning of the incident, a single-engine airplane departed from Frankfurt Airport at 0825 local time. The aircraft was operating as an ambulance flight bound for Cologne, with a pilot and one nurse on board. Approximately thirty-five minutes after takeoff, the pilot encountered significantly reduced visibility caused by thick fog. In response to these conditions, the pilot initiated an emergency landing procedure. During this maneuver, the aircraft struck trees and crashed in the Frauenwald forest area near Idstein. The airframe, which was named 'Eiderente', was destroyed in the impact. Both individuals aboard the plane sustained injuries.
Findings
The primary factor leading to the crash was the pilot's decision to attempt an emergency landing due to poor visibility conditions caused by dense fog. This action resulted in the aircraft impacting trees during the descent.