What happened
On July 20, 2006, a Cessna U206F, registration PH-PCT, was conducting a parachuting operation at Midden-Zeeland Airport (EHMZ). Shortly after takeoff, the tandem master observed white smoke emanating from the aircraft. While the pilot initially suspected an engine fire or electrical issue, an observer on the ground reported seeing fuel leaking from the aircraft.
As the aircraft climbed, the engine began to lose power, making it impossible to maintain altitude. Due to the presence of a campsite, tree lines, and recreational areas on the nearby Veerse Meer, as well as glider activity in the area, the pilot could not land in several directions. After performing a 180-degree turn, the pilot executed an emergency landing in a cornfield. The aircraft struck the ground heavily, sliding approximately 100 meters and crossing a path before coming to a halt. All six occupants (the pilot and five passengers) were able to evacuate the aircraft without injury, though the aircraft sustained damage to the nose wheel and horizontal stabilizer.
The investigation
The investigation focused on the cause of the engine power loss and the fuel loss observed by witnesses. Investigators examined the state of the aircraft following the landing and found that the fuel cap for the right tank was attached to its safety lanyard but was not secured to the filler neck. The left tank cap was properly in place.
Analysis of the flight sequence suggested that while the pilot had visually checked the caps after refueling, the right cap had likely been placed on the opening without being tightened or locked. This allowed the cap to come loose during taxiing or takeoff. The "white smoke" reported by the tandem master was identified as fuel mist being drawn out of the right tank due to pressure differentials.
Findings
- The engine power loss was caused by a disruption in the fuel supply to the engine.
- This disruption resulted from fuel escaping from the right tank and/or pressure changes within the tank caused by the loose cap.
- The pilot was operating with the right fuel tank selected, which led to the depletion of the fuel supply.
- The pilot's decision to delay standard emergency procedures (such as shutting off the engine or electrical systems) was influenced by the low altitude, high ambient temperature, and the immediate need to maintain control and communication during the descent.