What happened
The flight originated from an airfield with a density altitude of approximately 8,400 feet. The aircraft was loaded near its maximum certificated gross weight limit, carrying the pilot and three passengers. During the takeoff roll on runway 18, either the pilot's side door failed to latch securely or it opened shortly after liftoff.
The open door significantly degraded the aircraft's climb performance. The pilot became distracted by the malfunctioning door and inadvertently flew the aircraft into a box canyon. While attempting a turnaround maneuver within the confined terrain, the aircraft lost airspeed, stalled, and collided with trees and the ground.
The investigation
Examination of the event focused on the aerodynamic impact of the open door and the pilot's reaction to the situation. Investigators noted that the combination of high density altitude, maximum gross weight, and reduced lift from the open door created a critical performance deficit during the initial climb phase.
Findings
Contributing factors included the failure to ensure the pilot's door was fully closed and latched before takeoff. The resulting degradation in climb performance prevented the aircraft from clearing obstacles. Additionally, the pilot's attention was diverted by the open door, leading to spatial disorientation or poor situational awareness regarding terrain clearance.
Safety message
Pilots must ensure all doors are securely latched before takeoff, especially in high-density altitude conditions where climb performance is critical. Distractions during the critical phase of flight can lead to catastrophic outcomes if terrain clearance is compromised.