No fatalities

Pilot Diverts After Climb Failure Near Monarch Pass (N737DH)

Garfield, CO, US

On May 1, 1985, a Cessna 172 (registration N737DH) was involved in an aviation accident near Garfield, CO. No fatalities were reported. Investigators recorded the probable cause as: The aircraft's inability to climb above 10,300 feet, which prevented it from clearing Monarch Pass at an elevation of 11,312 feet, leading to a collision with trees during a course reversal. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-20Data APIEditorial standards

An aircraft departed Salida, Colorado, but failed to climb above 10,300 feet while attempting to cross Monarch Pass at an elevation of 11,312 feet. The pilot executed a turn and struck trees near Garfield.

What happened

The aircraft departed from Salida, Colorado, which is located approximately 20 miles east of Monarch Pass. During the flight, the pilot reported that the aircraft would not climb above an altitude of 10,300 feet. This ceiling was insufficient to clear Monarch Pass, which has an elevation of 11,312 feet.

Facing the inability to gain sufficient altitude, the pilot initiated a 180-degree turn to reverse course. During this maneuver, the aircraft impacted trees and settled into them on the east side of Monarch Pass near Garfield, Colorado. All three occupants, who were identified as pilots, sustained no injuries.

The investigation

The investigation focused on the mechanical performance of the aircraft during the climb phase. The pilot stated that the aircraft would not climb above 10,300 feet despite efforts to gain altitude necessary to clear the mountain pass.

Probable cause

The aircraft's inability to climb above 10,300 feet, which prevented it from clearing Monarch Pass at an elevation of 11,312 feet, leading to a collision with trees during a course reversal.

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Frequently asked questions

What happened in the 1 May 1985 Cessna 172 accident near Garfield, CO?

An aircraft departed Salida, Colorado, but failed to climb above 10,300 feet while attempting to cross Monarch Pass at an elevation of 11,312 feet. The pilot executed a turn and struck trees near Garfield.

Were there any fatalities in the 1 May 1985 Cessna 172 accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 1 May 1985 involved a Cessna 172, registration N737DH, at Garfield, CO.

What was the probable cause of the accident?

The aircraft's inability to climb above 10,300 feet, which prevented it from clearing Monarch Pass at an elevation of 11,312 feet, leading to a collision with trees during a course reversal.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X36429. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.