What happened
During the landing rollout, the aircraft began to drift toward the left side of the runway. The pilot attempted to correct this deviation by applying right rudder input. However, the pilot later stated that he overcontrolled the aircraft in this correction. In an effort to regain directional control, he applied left rudder and brake pressure, followed immediately by right rudder and brake inputs.
These rapid and aggressive control inputs aggravated the situation rather than resolving it. The loss of traction caused both main landing gear wheels to skid across the surface. As the pilot continued to attempt to avoid a nearby ditch, the aircraft's directional stability was completely lost. The nose of the aircraft subsequently pitched down and struck the ground, resulting in a nose-over incident.
The investigation
The investigation relied heavily on the pilot's account of the events. He confirmed that the initial drift required correction and admitted to overcontrolling the rudder pedals. The mechanical condition of the aircraft was not detailed in the provided source text, but the sequence of events points to a loss of directional control due to pilot input during the critical phase of landing rollout.
Findings
The primary factor in this accident was the pilot's inability to maintain directional control during the landing roll. The initial drift was corrected, but the subsequent overcorrection led to a cycle of aggressive rudder and brake inputs. This caused both main wheels to skid, eliminating any remaining traction or steering effectiveness. The attempt to avoid an obstacle (the ditch) while losing control resulted in the nose-over.
Safety message
Pilots should be aware that excessive rudder input during landing rollout can lead to a loss of directional control, particularly if it causes the main wheels to skid. Smooth, progressive corrections are essential to maintain traction and steering authority on the runway.