What happened
On 19 June 2019, a Jodel D120 Paris-Nice, registration G-BKCW, was performing a private flight from Perth Aerodrome to Kingsmuir. During the takeoff roll from Runway 27, the engine experienced a reduction in RPM and airspeed. Because other aircraft were occupying the adjacent taxiway, the pilot was unable to abort the takeoff and instead maintained a level attitude until the aircraft climbed to 1,000 feet, at which point engine performance appeared to recover.
After climbing to 2,400 feet, the pilot conducted performance checks and decided to return to Perth for a precautionary landing. During the approach to Runway 21, the engine power reduced once again, making it difficult to maintain altitude. As the aircraft reached approximately 10 feet above the runway, the engine RPM suddenly increased, causing the aircraft to yaw to the left. The pilot applied right rudder to correct the yaw, but this caused the aircraft to veer toward the right side of the runway. Upon touchdown, the landing gear collapsed, leading to the propeller striking the ground and causing damage to the left wing skin and woodwork.
The investigation
The investigation examined the engine performance and the environmental conditions at the time of the accident. The investigation noted that the aircraft had been held at a holding point for twenty minutes prior to departure, during which the pilot had selected the carburettor heat to the ON position. The investigation also reviewed the pilot's decision-making regarding the return to the airfield and the management of the engine during the approach.
Findings
- The atmospheric conditions, characterized by a temperature of 18°C and a dew point of 12°C with 70% humidity, created a high risk of carburettor icing during low power settings.
- The engine power fluctuations during takeoff and the subsequent circuit were likely caused by icing.
- The pilot's attempt to correct a left yaw with right rudder during the landing phase contributed to the aircraft veering off the right side of the runway.
- There were no injuries to the single occupant on board.