What happened
On March 30, 2018, at approximately 20:00 UTC, a Piper PA-11C, registration LV-NDS, was performing a local training flight at the Lobos Aerodrome in Buenos Aires, Argentina. After completing a one-hour flight, the pilot began taxiing toward the parking area. During a turn, the pilot applied the brakes, which triggered an uncommanded pivot. The aircraft veered off course and struck a parked Piper PA-A28R-202T, registration LV-MJJ, which was unoccupied at the time.
The impact caused significant damage to the LV-NDS propeller and engine, while the LV-MJJ sustained damage to its left wing semiplane, fuel tank, and windshield. The pilot of the LV-NDs escaped without no injuries.
The investigation
The investigation examined the mechanical state of the aircraft's directional control systems, including the tailwheel, pedals, and brakes. While the braking system was found to be functional, investigators noted that the aircraft was using automotive-grade brake hoses rather than certified aeronautical components. These non-aviation hoses lack the specialized fittings and protective braiding required to prevent twisting and withstand aeronautical fluid pressures.
Investigators also analyzed the physics of conventional gear aircraft during ground operations. They noted that the aircraft's center of gravity was positioned forward due to the pilot sitting in the front seat, which can reduce tailwheel effectiveness. Furthermore, the pilot's relatively low experience level—having only six total flight hours—was considered in the context of managing the inherent instability of tailwheel aircraft during taxiing.
Findings
- The loss of directional control was caused by an overcontrolled turn that released the tailwheel steering mechanism.
- The proximity of the parked aircraft prevented the pilot from performing corrective maneuvers to avoid the collision.
- The aircraft was utilizing non-aeronautical automotive brake hoses, which do not meet the quality or design standards required by the National Civil Aviation Administration (ANAC).
Safety action
- A recommendation was issued to the National Civil Aviation Administration (ANAC) to conduct a comprehensive audit of the maintenance facility responsible for the upkeep of LV-NDS to ensure technical reliability and adherence to aviation standards.