What happened
On 21 April 2007, a Spezio DAL-1, registration G-NOBI, was conducting a private flight at Nayland Airfield, Essex. During the initial approach to Runway 32, the pilot rejected the landing because the approach felt too fast and flat. Following the rejection, the pilot commenced a second circuit.
While on the downwind leg of the second circuit, the engine began running roughly and began emitting dark smoke from the cowling. Upon applying full throttle, the engine failed to respond normally, preventing a climb. Concerned about a potential engine fire and unable to reach the runway due to nearby power cables, the pilot opted for a forced landing in a large field short of the runway. Before the landing, the pilot switched off the fuel and magnetos. During the final approach, the pilot noted that the airspeed had become too low and the elevator response was insufficient during the flare.
The aircraft struck the ground heavily. The impact caused the landing gear to detach and resulted in damage to the lower fuselage and both wing leading edges. The pilot sustained one serious injury, specifically a severe compression fracture to a vertebra, which required hospitalisation.
The investigation
The AAIB examined the circumstances surrounding the engine malfunction and the subsequent landing. Investigators looked into the possibility of carburettor icing, noting that atmospheric conditions (temperature, dew point, and humidity) were such that icing was possible at glide power. However, because the carburettor heat remained selected during the circuit, the investigators found it unlikely that icing was the primary cause.
Post-accident examination of the aircraft showed no evidence of an engine fire occurring during flight or after the impact. The aircraft was subsequently moved abroad, and because it was awaiting repair, no formal inspection of the engine was conducted. The investigation also considered the pilot's experience, noting that this was his first solo flight in this specific aircraft type.
Findings
- The engine began running roughly and emitting smoke, likely due to the continued use of carburettor heat combined with a rich mixture setting.
- The pilot's lack of experience with the Spezio DAL-1 contributed to the heavy landing.
- The heavy impact caused the detachment of the landing gear and serious spinal injury to the pilot.