ANC06LA015 · Cessna 180

The airline transport certificated pilot was conducting a personal cross-country flight under Title 14, CFR Part 91, in an area of steep mountainous terrain. The pilot said his routine was to fly over a mountain saddle near the top of a glacier at 4,500 feet above sea level, and continue to his destination. He reported that he was cruising above the glacier at 4,500 feet altitude, when he encountered severe turbulence and downdrafts, and subsequently collided with the glacier. A U.S. Coast Guard C-130 airplane flying in the area received a signal from the accident airplane's emergency locator transmitter, and located the wreckage on the glacier. The aircraft commander said when they arrived over the area, the area was covered in clouds. He said they located clear air, descended, and returned to the accident site underneath the overcast. He said they could see up the glacier, and that there was about 200 feet of clearance between the saddle at the top of the glacier and the cloud cover. He stated as they passed over the wreckage approaching the saddle, their navigation instruments indicated a 40 knot headwind, and noted that the mountain peaks on either side of the saddle were obscured by clouds. He said they had to leave the area due to deteriorating weather. An Air National Guard helicopter dispatched to the accident site aborted several attempts to reach the site due to poor weather, and eventually reached the accident site about 9 hours after the accident. The Air National Guard para-rescue technician who made initial contact with the pilot reported that the pilot said he was flying up the glacier, encountered a downdraft, and turned down slope to "escape" when the airplane contacted the glacier. An area weather forecast valid at the time of the accident, indicated areas of marginal VFR weather with rain and snow showers. The forecast did not forecast any significant turbulence. The closest automated weather reporting facility is 7 miles from the accident site. Observations taken during the timeframe of the accident, reported rapidly varying visibilities from 10 miles to less than 1 mile, and ceilings varying from 100 feet to 6,000 feet. The accident pilot said there were no mechanical anomalies with the airplane prior to the accident. As of August, 2006, the airplane had not been recovered.

Verbatim NTSB analysis and probable cause from the NTSB dataset