What happened
The flight crew initiated takeoff operations from an unpaved sod strip under challenging environmental conditions. The runway surface was wet and covered with tall grass, which likely increased rolling resistance and reduced acceleration efficiency. Meteorological data indicated an outside air temperature of 90 degrees Fahrenheit, creating high-density altitude conditions that degrade engine performance and lift generation. Additionally, the aircraft encountered a five-knot quartering tailwind during the roll.
During the initial climb phase, the aircraft failed to gain sufficient altitude and settled back onto the runway surface. Recognizing the imminent danger, the pilot applied full available power and adjusted the flap configuration to optimize lift. To reduce weight and improve climb performance, the crew began jettisoning the onboard fuel load. Despite these corrective actions, the aircraft remained airborne but lacked the energy necessary to clear the tree line situated at the end of the runway.
The aircraft subsequently collided with the trees and crashed. The combination of high temperature, wet grass surface, and tailwind component critically compromised the takeoff performance envelope, preventing the aircraft from achieving a safe climb gradient.
The investigation
Examination of the event focused on the interaction between the aircraft's performance capabilities and the environmental factors present during the takeoff roll. The pilot's account confirmed that the aircraft settled back onto the runway shortly after liftoff. The decision to dump fuel indicates an attempt to reduce gross weight to improve climb rate, a standard emergency procedure for weight-imbalanced or underpowered climbs. However, the available runway length and surface conditions were insufficient to allow the aircraft to recover from the settling phase and clear the obstacle.
Findings
The primary factors contributing to this accident included:
- High density altitude due to 90-degree temperatures
- Wet, grass-covered runway surface increasing drag
- Five-knot quartering tailwind reducing groundspeed efficiency
- Insufficient climb performance to clear the tree line
The aircraft was unable to achieve the necessary climb gradient to clear obstacles after a failed initial ascent. The environmental conditions exceeded the safe operating limits for the takeoff configuration.
Safety message
Pilots must carefully calculate takeoff performance requirements before attempting operations from unpaved or wet surfaces, especially in high-temperature conditions. Tailwinds significantly reduce acceleration and lift generation. If an aircraft settles back onto the runway during takeoff, immediate action to reduce weight and apply full power is critical, but success depends on remaining runway length and surface conditions.