What happened
On the night of the accident, N4581E, an aircraft performing cargo operations, was involved in a collision with a residential structure. The flight was being conducted under Visual Flight Rules (VFR) when it struck a two-story duplex at an altitude of approximately 18 feet above ground level. At the time of impact, the aircraft was in a light wing-low attitude.
While the pilot reported visibility between 7 and 10 miles at the crash site, eyewitnesses near the location described much more severe conditions, noting that heavy snow was falling and visibility had dropped to one mile or less. There was no evidence of mechanical failure or engine malfunction found during the post-crash examination of the airframe.
Findings
Investigations into the accident identified several contributing factors related to the pilot's decision-making and environmental conditions. The primary cause was determined to be the pilot flying into instrument meteorological conditions (IMC) while operating under VFR.
Key findings included:
- Adverse weather conditions, specifically low ceilings, heavy snow, and obscuration.
- Nighttime operations in light conditions.
- Failure to maintain proper altitude and clearance from high terrain.
- Reduced visual lookout due to the weather.
- A lack of familiarity with the specific geographic area by the pilot.
Additionally, records indicated that the pilot had been grounded for two weeks preceding the event due to medical issues, and there was no documentation confirming the pilot had been route-checked for operations in the Aspen area.