Casualties unknown

Aircraft Collides with Trees in Hayden Pass After Disappearance (N4753A)

Coaldale, CO, US

On July 3, 1999, a Piper PA-22-150 (registration N4753A) was involved in an aviation accident near Coaldale, CO. Investigators recorded the probable cause as: The pilot's failure to maintain control of the airplane for reasons for reasons undetermined. 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 2026-06-10Data APIEditorial standards

An airplane missing for 9 days was found at the 10,350-foot level of Hayden Pass, Colorado, having collided with trees. The pilot had departed Boulder at 0933, and no preimpact malfunctions were found.

Overview

An airplane went missing after departing from Boulder, Colorado, en route to Center, Colorado. The aircraft was located nine days later in a heavily forested area on Hayden Pass, between Coaldale and Villa Grove, Colorado. It had collided with trees, and no evidence of preimpact mechanical failure was discovered.

Flight Details

The pilot had obtained a weather briefing before departure but did not file a flight plan. According to NTAP data, a radar target corresponding to the airplane departed Boulder at 0933. The target was tracked to the vicinity of the accident site, where radar contact was lost.

Accident Site

The wreckage was found at the 10,350-foot elevation of Hayden Pass, whose summit is 11,184 feet. The airplane had struck a tree, breaking off all limbs on one side, and came to rest at its base. Adjoining trees were undisturbed. Visual meteorological conditions prevailed in the area at the time.

Investigation Findings

Examination of the wreckage revealed no evidence of preimpact failure or malfunction of the airframe, flight controls, engine, or propeller.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X19236. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.