What happened
During a nighttime approach in conditions involving snow, drizzle, and a right quartering tailwind, the captain initiated an ILS Runway 19 approach after verifying that the weather was above landing minimums. Data from the cockpit voice recorder and pilot interviews indicated that the approach lights were visible before the aircraft reached the decision height.
The crew reported that the aircraft touched down slightly left of the centerline. Upon touchdown, the pilots lost sight of the runway edge lights. The aircraft made contact with an unplowed portion of the partially plowed runway, approximately 60 feet to the left of the centerline. Following this contact, the landing gear collapsed, causing the aircraft to slide to a stop. The aircraft sustained substantial damage, and the pilots were not injured.
Findings
Investigation into the runway conditions revealed that while the crew had checked NOTAMs and was aware that 130 feet of the 150-foot wide runway had been plowed, the NOTAM failed to specify that the plowing was not centered. Additionally, two-foot snow banks at the edges of the runway were noted to be slightly higher than the runway edge lights.