Crop duster crashes into cornfield after losing climb performance (N731SM)

What happened

The pilot reported that during a swath run, the aircraft began to mush when he attempted to initiate a climb. The aircraft was operating over tall corn, which significantly restricted visibility and lift. Despite applying full power, the aircraft failed to gain altitude. It continued forward for approximately one mile in a semi-stalled condition before beginning to settle downward. Realizing the inability to recover, the pilot attempted to jettison the chemical load to reduce weight. However, the aircraft settled into the cornfield and crashed.

The investigation

Investigators calculated the density altitude at the time of the accident to be 4,800 feet. This high density altitude condition reduced engine performance and aerodynamic efficiency, contributing to the aircraft's inability to climb despite full power application.

Findings

• High density altitude (4,800 ft) degraded climb performance.
• Tall crop obstruction prevented visual reference and likely affected airflow.
• Semi-stalled condition resulted from insufficient lift at low speed and high weight.
• Inability to climb necessitated an emergency landing in the field.