What happened
The pilot attempted to depart from a short, unpaved airstrip measuring 2,500 feet in length. The runway surface was dirt, situated at an elevation of 3,500 feet mean sea level (MSL). The aircraft was carrying a load of agricultural chemicals, which contributed to the total weight and center of gravity constraints during takeoff.
At the time of departure, ambient temperatures reached 85 degrees Fahrenheit. Wind conditions were reported as light and variable, offering little assistance for lift generation or ground speed management. Despite these challenging environmental factors and the heavy payload, the pilot initiated the takeoff roll.
Following liftoff, the aircraft failed to achieve a positive rate of climb. The pilot was unable to maintain altitude above the terrain. Consequently, the aircraft descended and impacted a nearby plowed field immediately after leaving the airstrip environment. Upon impact, the nose section of the aircraft collapsed or nosed over due to the force of the collision with the uneven ground.
The investigation
Post-accident examination focused on the operational parameters at the time of the event. Investigators noted the significant weight load carried by the aircraft in the form of agricultural chemicals. This payload, combined with the high density altitude caused by the 85-degree temperature and 3,500-foot elevation, severely degraded performance capabilities.
The short length of the dirt runway provided insufficient distance for the aircraft to accelerate to a safe climb-out speed while carrying the heavy load. The lack of adequate airspeed resulted in an inability to generate sufficient lift to overcome gravity and drag.
Findings
Several critical factors contributed to the accident sequence:
- High density altitude due to temperature and elevation reduced engine power and wing efficiency.
- Excessive weight from agricultural chemicals limited climb performance.
- Short runway length prevented adequate acceleration for a safe departure.
- Light and variable winds offered no aerodynamic advantage during the critical takeoff phase.
The primary causal factor was the pilot's decision to attempt a takeoff under conditions where the aircraft's performance capabilities were insufficient to clear obstacles or maintain altitude. The combination of heavy load, hot temperatures, high elevation, and short field length created an unsurvivable scenario for the specific aircraft type involved.
Safety message
Pilots operating from high-elevation airports in hot weather must carefully calculate takeoff performance data. Carrying heavy payloads on short, unpaved runways requires rigorous weight-and-balance analysis. If calculated performance does not guarantee a safe climb gradient, the flight should be delayed for cooler temperatures or the payload reduced to ensure safety.