Casualties unknown

Mountain Flying Training Seminar Airplane Strikes Trees and Rock Outcropping (N82716)

Sonora, CA, US

On July 28, 1991, a Piper PA 28-181 (registration N82716) operated by West Valley Flying Club Inc. was involved in an aviation accident near Sonora, CA. Investigators recorded the probable cause as: FAILURE OF THE FLIGHT INSTRUCTOR/PILOT-IN-COMMAND TO ADEQUATELY SUPERVISE THE FLIGHT AND TO MAINTAIN ADEQUATE AIRSPEED BY EXCEEDING THE CLIMB PERFORMANCE OF THE AIRPLANE. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 5 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

During a mountain flying training seminar, an airplane with three occupants was observed flying low in a canyon. It made a left turn, pulled up, then descended; it struck a tree, another tree, and a rock outcropping before a post-impact fire.

Accident Overview

A certificated flight instructor and two certificated private pilots were participating in a mountain flying training seminar as part of a three-airplane flight. The accident airplane was observed following a highway up a canyon toward a 9,600-foot mountain pass.

Flight Path

The airplane was observed at approximately 200 feet above the ground, below the surrounding canyon walls. The terrain rises rapidly at the end of the canyon. The airplane was seen to make a left turn away from high terrain, pull up into a nose-high altitude, and then descend from view.

Collision and Fire

The airplane was found to have struck a pine tree with the right wingtip, then struck another tree, and subsequently collided with a large rock outcropping at an elevation of about 9,000 feet mean sea level. An intense post-impact fire consumed almost all of the airplane, with the exception of portions of the left wing and tail. The density altitude at the time was approximately 12,000 feet.

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Frequently asked questions

What happened in the 28 Jul 1991 Piper PA 28-181 accident near Sonora, CA?

During a mountain flying training seminar, an airplane with three occupants was observed flying low in a canyon. It made a left turn, pulled up, then descended; it struck a tree, another tree, and a rock outcropping before a post-impact fire.

What aircraft was involved and where did it happen?

The accident on 28 Jul 1991 involved a Piper PA 28-181, registration N82716, operated by West Valley Flying Club Inc., at Sonora, CA.

What was the probable cause of the accident?

FAILURE OF THE FLIGHT INSTRUCTOR/PILOT-IN-COMMAND TO ADEQUATELY SUPERVISE THE FLIGHT AND TO MAINTAIN ADEQUATE AIRSPEED BY EXCEEDING THE CLIMB PERFORMANCE OF THE AIRPLANE. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT-IN-COMMAND'S INADEQUATE PLANNING AND HIS SELECTION OF AN IMPROPER ALTITUDE FOR FLIGHT INTO RISING…

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X17576. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.