What happened
The pilot initiated an instrument landing system (ILS) approach toward Runway 29 at an airfield where weather conditions were reported as having a zero-foot obscured ceiling and visibility of only 1/16 mile due to fog. During the final segment of the descent, the pilot experienced disorientation and confusion regarding his position relative to the runway environment. Recognizing the inability to continue safely, he began executing a missed approach procedure. However, before reaching the airport surface, the aircraft collided with a tree located approximately 1/2 mile south of the approach end of Runway 29, resulting in impact with the ground.
The investigation
Examination of the accident site and available data confirmed the location of the impact relative to the runway threshold. Weather reports from the time of the incident corroborated the extremely low visibility and ceiling conditions that challenged visual reference during the approach phase.
Findings
The primary factors contributing to this accident were the zero-foot obscured ceiling and 1/16 mile visibility with fog, which severely degraded situational awareness. The pilot's decision to continue the approach into these marginal weather conditions without adequate visual references led to spatial disorientation. The failure to maintain terrain clearance during the missed approach initiation resulted in the collision with the tree.
Safety message
Pilots must strictly adhere to minimums and be prepared to execute a missed approach immediately if visual references are not established or if situational awareness is compromised. Continuing an approach into conditions below published minimums significantly increases the risk of controlled flight into terrain.