What happened
On July 26, 2011, a Robinson R22 helicopter, registered as PT-YTL, was conducting a local training flight from the Aeródromo Nacional de Aviação (SWNV) in Goiânia, Brazil. The flight, operated by Unnilodi Agronegocios Cereais Ltda., carried two occupants. During the landing phase, the aircraft experienced an abnormal contact with the runway, resulting in a hard landing. The impact caused substantial damage to the airframe, including damage to the skids and the main rotor blades, which collided with the ground. Both occupants were unharmed.
The investigation
CENIPA investigators learned of the occurrence through an anonymous report rather than a formal notification from the operator, as required by Brazilian aviation regulations. The investigation faced significant obstacles from the outset. The aircraft was removed from the accident site to a hangar without the authorization of the investigation commission. Furthermore, while the pilot held a valid commercial helicopter license and medical certificate, he refused to provide a statement to the investigators regarding the sequence of events. Due to this lack of cooperation and the unauthorized movement of the aircraft, the investigation was officially terminated.
Findings
- The pilot held a valid medical certificate and a valid helicopter rating for the Robinson R22.
- The aircraft's airworthiness certificate was valid, and all engine and airframe logbooks were up to date.
- The pilot's refusal to cooperate with investigators prevented the identification of the specific contributing factors to the hard landing.
- It could not be determined if the aircraft was within weight and balance limits or if meteorological conditions were suitable for the flight.
- The operator failed to notify the accident investigation authority (SIPAER) of the occurrence.