Casualties unknown

Pilot Mistakes Vegetation for Runway in Nighttime Crash (N734DL)

Monroe, WA, US

On July 29, 1993, a Cessna 172N (registration N734DL) operated by Duane O. Kaasa was involved in an aviation accident near Monroe, WA. Investigators recorded the probable cause as: The pilot's failure to properly identify the runway during a nighttime approach, resulting in the aircraft impacting vegetation; factors include the unlighted airport and the pilot's lack of recent night flight time. 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 2026-06-22Data APIEditorial standards

A pilot attempting to land at an unlighted airport on a dark night mistook a row of vegetation for the runway, resulting in a ground impact. The pilot had no recent night flight experience.

What happened

The aircraft was involved in a nighttime landing attempt at an unlighted airport under dark conditions. The pilot initiated an approach toward a row of vegetation, which he incorrectly identified as the runway. As the aircraft descended to a low altitude, the pilot attempted to correct his trajectory by veering toward the actual runway position to align with the centerline.

During this maneuver, the aircraft impacted the ground before reaching the airport environment. The crash occurred due to the pilot's inability to visually distinguish the runway from surrounding terrain features in the absence of lighting.

The investigation

Review of the flight history indicated that the pilot had no recent night flight time. This lack of recent experience likely contributed to the difficulty in navigating and identifying landing zones during low-visibility conditions. The airport's lack of lighting systems further complicated the visual approach, forcing reliance on unaided vision.

Findings

The primary factor in this accident was the pilot's misidentification of a vegetation line as the runway. Contributing to this error was the dark night environment and the absence of runway lighting at the destination airport. The pilot's lack of recent night flight experience reduced his ability to safely execute the approach under these challenging visual conditions.

Probable cause

The pilot's failure to properly identify the runway during a nighttime approach, resulting in the aircraft impacting vegetation; factors include the unlighted airport and the pilot's lack of recent night flight time.

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Frequently asked questions

What happened in the 29 Jul 1993 Cessna 172N accident near Monroe, WA?

A pilot attempting to land at an unlighted airport on a dark night mistook a row of vegetation for the runway, resulting in a ground impact. The pilot had no recent night flight experience.

What aircraft was involved and where did it happen?

The accident on 29 Jul 1993 involved a Cessna 172N, registration N734DL, operated by Duane O. Kaasa, at Monroe, WA.

What was the probable cause of the accident?

The pilot's failure to properly identify the runway during a nighttime approach, resulting in the aircraft impacting vegetation; factors include the unlighted airport and the pilot's lack of recent night flight time.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X13018. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.