Casualties unknown

Unauthorized Flight Ends in Collision with Mount Rubidoux (N9466T)

Riverside, CA, US

On October 6, 1990, a Cessna 210 (registration N9466T) was involved in an aviation accident near Riverside, CA. Investigators recorded the probable cause as: IMPAIRMENT OF THE PILOT FROM USE OF DRUGS (COCAINE), AND HIS FAILURE TO MAINTAIN CLEARANCE (OR ALTITUDE) FROM THE MOUNTAIN. FACTORS RELATED TO THE ACCIDENT WERE: DARKNESS AND THE PILOT'S PSYCHOLOGICAL CONDTION (DEPRESSION). This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 8 related events involving the same aircraft type or operator are linked below.

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

A pilot took an airplane without permission and flew from an airport near his residence. After about 25 minutes, the airplane struck the west side of Mount Rubidoux. Toxicology tests revealed cocaine in the pilot's system.

Incident Overview

A pilot took an airplane without the owner's permission and departed from an airport located near his residence. According to the investigation, the flight lasted approximately 25 minutes before the airplane collided with the west side of Mount Rubidoux, which is situated about one mile east-southeast of the departure airport.

Investigation Findings

Examination of the crash site indicated that the airplane struck rising terrain while in a near level flight attitude. No further details about the impact dynamics were provided in the investigation records.

Pilot Background

Acquaintances reported that the pilot was familiar with the area, having flown from the same airport for over 10 years. They also noted that he had recently lost his job and was experiencing depression.

Toxicology Results

Toxicology analysis of the pilot's blood detected cocaine and its metabolite benzoylecgonine at concentrations of 340 ng/mL and 1330 ng/mL, respectively.

All Cessna 210 accidents →

Frequently asked questions

What happened in the 6 Oct 1990 Cessna 210 accident near Riverside, CA?

A pilot took an airplane without permission and flew from an airport near his residence. After about 25 minutes, the airplane struck the west side of Mount Rubidoux. Toxicology tests revealed cocaine in the pilot's system.

What aircraft was involved and where did it happen?

The accident on 6 Oct 1990 involved a Cessna 210, registration N9466T, at Riverside, CA.

What was the probable cause of the accident?

IMPAIRMENT OF THE PILOT FROM USE OF DRUGS (COCAINE), AND HIS FAILURE TO MAINTAIN CLEARANCE (OR ALTITUDE) FROM THE MOUNTAIN. FACTORS RELATED TO THE ACCIDENT WERE: DARKNESS AND THE PILOT'S PSYCHOLOGICAL CONDTION (DEPRESSION).

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X24483. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.