What happened
The accident occurred during the departure phase of flight from an unimproved airstrip. The pilot was operating under conditions that significantly impacted aircraft performance. Specifically, the aircraft was loaded at a high gross weight, and the ambient temperature was elevated. Additionally, there was a notable lack of wind to assist with lift generation during takeoff.
The combination of these factors resulted in a density altitude of 3,475 feet. Under these conditions, the airplane was unable to generate enough lift to climb effectively. Consequently, the aircraft failed to gain sufficient altitude to clear objects located at the departure end of the runway.
The investigation
Investigation into the mechanical aspects of the flight revealed no evidence of pre-impact mechanical failure or malfunction that would have impaired normal operation. The primary issue was identified as performance-related rather than equipment-related. The physical state of the airstrip was noted as unimproved, which may have contributed to ground roll dynamics, but the critical factor was the aerodynamic environment.
Findings
The analysis highlighted several contributing factors that led to the accident. The pilot did not correctly plan for the specific environmental and loading conditions present at the time of departure. The high gross weight reduced the aircraft's climb capability. The high temperature further degraded engine performance and lift generation. The lack of wind removed a potential variable that could have aided in takeoff distance reduction.
The density altitude of 3,475 feet served as a key indicator of the thin air conditions, which directly contributed to the failure to gain sufficient altitude. This outcome demonstrates the critical importance of accurate performance calculations before attempting departure from unimproved strips under high-density-altitude conditions.