What happened
The pilot was conducting an agricultural spraying operation when the incident occurred. While circling the designated field to be treated, the pilot communicated with a ground flagman who was coordinating the spray pattern. During this phase of the operation, the aircraft began to lose altitude unexpectedly and sank toward the ground.
In response to the sinking condition, the pilot dumped the chemical load from the aircraft. However, the loss of altitude continued despite the weight reduction. The aircraft struck trees during its descent before finally impacting the ground in a soft, wet field. Upon impact, the aircraft nosed over and came to rest in an inverted position.
The investigation
The investigation focused on the mechanical condition of the aircraft and the circumstances surrounding the loss of altitude. Examination revealed that the aircraft had struck trees during its descent, which contributed to the final resting position upside down. The wet conditions of the field likely influenced the severity of the nosing-over event upon initial ground contact.
Findings
Several factors contributed to this accident. The primary issue was the uncommanded sinking of the aircraft while it was circling at low altitude during the spraying phase. This loss of lift or control resulted in a collision with trees and subsequent ground impact. The soft, wet nature of the landing field exacerbated the nosing-over tendency upon touchdown.