Casualties unknown

Cessna 170B crashes during low pass maneuver; pilot intoxicated (N4693C)

Curtis, WA, US

On September 16, 1991, a Cessna 170B (registration N4693C) operated by Kirkendall, Curtis was involved in an aviation accident near Curtis, WA. Investigators recorded the probable cause as: The pilot's failure to maintain control during an aerobatic maneuver while intoxicated by alcohol. 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 2026-06-19Data APIEditorial standards

A Cessna 170B collided with terrain while performing a low pass. Witnesses reported the nose dropped during an inverted roll attempt. Toxicology confirmed the pilot had a blood alcohol level of .08.

What happened

The Cessna 170B was engaged in a low pass maneuver over an airstrip when it collided with the terrain. According to witness accounts, the pilot appeared to be attempting a roll at the time of the incident. During this maneuver, the aircraft became inverted and the nose dropped unexpectedly. The aircraft subsequently struck the ground in a nose-low attitude.

The investigation

Following the accident, investigators collected toxicological samples from the pilot. Analysis of these samples revealed that the pilot's blood alcohol level was .08 grams per 100 milliliter. This finding indicates significant impairment at the time of the flight.

Findings

The primary factors contributing to this accident include the loss of control during an aerobatic maneuver and the pilot's intoxication. The decision to attempt a roll while inverted during a low pass, combined with alcohol consumption, led directly to the collision with terrain.

Probable cause

The pilot's failure to maintain control during an aerobatic maneuver while intoxicated by alcohol.

Frequently asked questions

What happened in the 16 Sept 1991 Cessna 170B accident near Curtis, WA?

A Cessna 170B collided with terrain while performing a low pass. Witnesses reported the nose dropped during an inverted roll attempt. Toxicology confirmed the pilot had a blood alcohol level of .08.

What aircraft was involved and where did it happen?

The accident on 16 Sept 1991 involved a Cessna 170B, registration N4693C, operated by Kirkendall, Curtis, at Curtis, WA.

What was the probable cause of the accident?

The pilot's failure to maintain control during an aerobatic maneuver while intoxicated by alcohol.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X18198. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.