1 fatality

Mountain Pass Downdraft Forces Emergency Landing (N1941B)

San Luis, CO, US

On December 25, 1999, a Luscombe 8E (registration N1941B) was involved in an aviation accident near San Luis, CO. One person was killed. Investigators recorded the probable cause as: The pilot's inadequate in-flight decision, and the subsequent inadvertent stall/mush. Factors were the pilot's lack of total experience in mountain flying, the high density altitude, and downdraft weather conditions. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-07-04Data APIEditorial standards

A pilot reported being forced into a mountain pass by a strong downdraft, with rescue arriving 25 hours later. Witnesses noted lenticular clouds and high winds.

Incident Summary

A pilot attempting to cross a 12,560-foot mountain pass encountered a severe downdraft that forced the aircraft into the ground within seconds. The pilot described the event as akin to being swatted by a fly. Rescue teams reached the pilot approximately 25 hours after the incident.

Pilot Account

The pilot stated that he approached the pass with 500 to 600 feet of clearance. During the descent, he reported that the flight controls "had no feel in them." The pilot estimated the wind was blowing from the east at 40 to 50 miles per hour. He later remarked that he should have "possibly [flown] higher or not [have] attempt[ed] to fly over the ridge at all."

Witness Reports

A pilot with a glider rating, who was flying within 5 miles of the accident site, reported that lenticular clouds were present over the mountain throughout the day and that the wind was blowing from east-southeast to west. A law enforcement officer who drove up the mountain on the night of the incident observed wind blowing westward down the mountain at 40 to 60 miles per hour.

Environmental Conditions

The computed density altitude at the site was approximately 12,306 feet.

Frequently asked questions

What happened in the 25 Dec 1999 Luscombe 8E accident near San Luis, CO?

A pilot reported being forced into a mountain pass by a strong downdraft, with rescue arriving 25 hours later. Witnesses noted lenticular clouds and high winds.

Were there any fatalities in the 25 Dec 1999 Luscombe 8E accident?

The accident was fatal, resulting in 1 fatality.

What aircraft was involved and where did it happen?

The accident on 25 Dec 1999 involved a Luscombe 8E, registration N1941B, at San Luis, CO.

What was the probable cause of the accident?

The pilot's inadequate in-flight decision, and the subsequent inadvertent stall/mush. Factors were the pilot's lack of total experience in mountain flying, the high density altitude, and downdraft weather conditions.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X20231. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.