Casualties unknown

Student Demo Flight Ends in Mountainous Terrain Crash (N9021H)

Incline Village, NV, US

On April 13, 1990, a Cessna 172M (registration N9021H) was involved in an aviation accident near Incline Village, NV. Investigators recorded the probable cause as: The instructor pilot's failure to maintain terrain clearance during a student demonstration flight in mountainous terrain at high density altitude and near maximum gross weight. 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 2026-06-22Data APIEditorial standards
Aircraft registered N9021H
Aircraft registered N9021H. Photo: BriYYZ from Toronto, Canada / CC BY-SA 2.0, via Wikimedia Commons

An aircraft crashed into mountainous terrain during a student demonstration flight. The plane struck a tree and descended uncontrollably at high density altitude near its maximum gross weight.

What happened

The accident occurred while the aircraft was conducting a student demonstration flight over rugged, mountainous terrain. The instructor pilot was operating the controls at a low altitude when the aircraft collided with a tree. Following the impact, the airplane descended in an uncontrolled manner and subsequently impacted the ground.

The crash site was located at an elevation of 8,700 feet. Environmental conditions contributed significantly to the event, with the density altitude estimated at 10,140 feet. Additionally, the aircraft was loaded near its maximum gross weight limit at the time of the incident.

The investigation

Investigators examined the wreckage and the circumstances surrounding the flight path. The primary mechanical finding was that the airplane struck a tree before descending to the ground. The high density altitude and heavy loading were noted as critical factors affecting performance.

Findings

The combination of low-altitude flight over mountains, high density altitude, and maximum gross weight created hazardous conditions. The collision with the tree initiated the uncontrolled descent that led to the final impact.

Probable cause

The instructor pilot's failure to maintain terrain clearance during a student demonstration flight in mountainous terrain at high density altitude and near maximum gross weight.

Frequently asked questions

What happened in the 13 Apr 1990 Cessna 172M accident near Incline Village, NV?

An aircraft crashed into mountainous terrain during a student demonstration flight. The plane struck a tree and descended uncontrollably at high density altitude near its maximum gross weight.

What aircraft was involved and where did it happen?

The accident on 13 Apr 1990 involved a Cessna 172M, registration N9021H, at Incline Village, NV.

What was the probable cause of the accident?

The instructor pilot's failure to maintain terrain clearance during a student demonstration flight in mountainous terrain at high density altitude and near maximum gross weight.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X23026. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.