What happened
The pilot reported that during the initial climb after takeoff, the engine experienced a temporary loss of power, causing the revolutions per minute (RPM) to drop from 2650 to 2500. Recognizing the issue, the pilot decided to abort the takeoff and informed the passengers that they would need to land immediately. As the aircraft touched down on the runway, the engine unexpectedly regained full power. Given the snow-covered runway and the limited stopping distance remaining, the pilot made the decision to continue the takeoff rather than attempt a stop.
At approximately the same time, the passenger seated in the right front seat braced for an anticipated crash. In doing so, the passenger inadvertently stepped on the right rudder pedal. This unintended input caused the aircraft to depart the right side of the runway and strike a dirt berm that was eight feet high.
The investigation
Following the incident, investigators examined the aircraft's mechanical systems to determine the cause of the initial power loss. The inspection revealed no significant engine malfunctions. The temporary drop in RPM during the climb phase could not be attributed to a mechanical failure or defect in the engine components.
Findings
The sequence of events indicates that while the initial power fluctuation was real, it did not stem from a mechanical fault. The critical factor leading to the departure from the runway was the inadvertent rudder input by the passenger during the high-stress moment of landing and subsequent takeoff continuation. The combination of snow-covered conditions, marginal stopping distance, and the passenger's action resulted in the collision with the berm.
Safety message
This incident highlights the importance of passenger awareness and restraint during critical phases of flight, particularly during takeoff and landing. Passengers should be instructed to remain seated and avoid touching any controls or pedals, as even inadvertent contact can significantly affect aircraft handling.