What happened
On May 3, 2022, a PA-25-235 aircraft, registration PT-OUB, was engaged in a crop-dusting operation at Fazenda Promessa in the municipality of Alto Paraíso de Goiás. The aircraft was performing a routine agricultural pass when the pilot attempted to execute a repositioning turn, often referred to as a "balloon" turn.
During this maneuver, the pilot reported hearing an unusual noise originating from the left side of the aircraft, likely from the wing area. Following this sound, the aircraft began to roll to the left, resulting in a loss of control in flight and a progressive loss of altitude. The aircraft subsequently collided with the ground at a vertical angle of approximately 45 degrees, sliding about 30 meters before coming to a complete stop. The impact caused substantial damage to the airframe, including a broken engine mount, a deformed left wing strut, and the partial separation of the left wing. The pilot was able to abandon the aircraft on his own and sustained no injuries.
The investigation
CENIPA investigators examined the wreckage and analyzed the aircraft's flight logs and maintenance records. The investigation included a laboratory analysis of the wing struts to determine if structural failure or corrosion played a role in the accident. The study of the propeller blades indicated that the engine was still producing power at the moment of impact, as transverse scratches were present on the blades.
Investigators also reviewed the aircraft's maintenance history, finding that the airframe, engine, and propeller logs were up to date, and the aircraft had undergone a 50-hour inspection only 30 hours prior to the accident. The aircraft was also confirmed to be operating within its maximum takeoff weight limits.
Findings
- The pilot was qualified, experienced in this type of operation, and held valid medical and aeronautical ratings.
- Weather conditions were favorable for VFR flight.
- The aircraft was within prescribed weight and balance limits.
- Laboratory analysis of the wing struts determined that the fractures and dents were caused by overload mechanisms resulting from the impact with the ground, rather than pre-existing corrosion or structural fatigue.
- It remains undetermined whether the separation of certain aircraft components during flight contributed to the loss of controllability.