What happened
On August 18, 1996, a private flight involving a Rans S12 ultralight, registration PH-2J1, resulted in an uncontrolled impact with the ground near Maasdam. The aircraft was operating at approximately 1,000 feet during a cruise phase when the engine suddenly ceased functioning. The pilot attempted several restarts using the electric starter; however, the engine failed to ignite. During these repeated attempts to restore power, the pilot's attention was diverted from flight controls, causing the aircraft to lose altitude and strike the ground. The pilot sustained serious injuries, while the passenger sustained light injuries.
The investigation
Investigators examined the aircraft's fuel system and maintenance history. The aircraft was within its maximum takeoff weight limits at the time of the accident. While the owners were responsible for their own maintenance, no evidence of improper upkeep or existing defects was found. Technical analysis of the fuel system revealed that while the wing tanks were empty, approximately 18 liters of fuel remained in the cabin tank. Upon inspection of the fuel lines, investigators discovered a crack in the fuel supply line at the connection point of the fuel pump. Once the damaged section of the line was removed and the connection repaired, the engine was able to start and run normally during testing.