No fatalities

Pilot loses depth perception during local flight, aircraft cartwheels on frozen lake (N65057)

Sunapee Lake, NH, US

On February 9, 1990, a Cessna 172P (registration N65057) operated by Ferns Flying Service was involved in an aviation accident near Sunapee Lake, NH. No fatalities were reported. Investigators recorded the probable cause as: The pilot's loss of depth perception during a local flight, which led to inadvertent contact with a frozen lake surface and subsequent substantial damage to the aircraft. 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

A pilot conducting a local flight lost depth perception and inadvertently contacted a frozen lake surface with the aircraft. The plane cartwheeled but sustained only substantial damage; no injuries were reported among the occupants.

What happened

The pilot was operating a local flight carrying two passengers when an incident occurred involving unintended contact with the ground. During the operation, the pilot inadvertently allowed the aircraft to touch down on the surface of a frozen lake. Following this initial contact, the aircraft began to cartwheel across the ice.

The event resulted in substantial damage to the airframe. Despite the severity of the physical impact and the violent motion of the aircraft, there were no injuries reported among the occupants. The pilot and the two passengers remained uninjured throughout the incident.

The investigation

Post-accident analysis focused on determining why the aircraft deviated from its intended flight path and made contact with the frozen surface. Investigators examined the circumstances surrounding the loss of control and the subsequent cartwheeling motion that led to the structural damage.

Findings

The primary factor contributing to the accident was identified as a physiological or perceptual error by the pilot. The pilot stated that he lost his depth perception during the flight, which directly led to the inability to maintain proper altitude awareness and avoid the lake surface. This loss of spatial orientation resulted in the hard landing and subsequent damage.

Safety message

This incident highlights the critical importance of maintaining situational awareness and depth perception during low-altitude or local flights. Pilots must be vigilant for signs of spatial disorientation, particularly when flying over featureless surfaces such as frozen lakes, which can impair visual references.

Probable cause

The pilot's loss of depth perception during a local flight, which led to inadvertent contact with a frozen lake surface and subsequent substantial damage to the aircraft.

Frequently asked questions

What happened in the 9 Feb 1990 Cessna 172P accident near Sunapee Lake, NH?

A pilot conducting a local flight lost depth perception and inadvertently contacted a frozen lake surface with the aircraft. The plane cartwheeled but sustained only substantial damage; no injuries were reported among the occupants.

Were there any fatalities in the 9 Feb 1990 Cessna 172P accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 9 Feb 1990 involved a Cessna 172P, registration N65057, operated by Ferns Flying Service, at Sunapee Lake, NH.

What was the probable cause of the accident?

The pilot's loss of depth perception during a local flight, which led to inadvertent contact with a frozen lake surface and subsequent substantial damage to the aircraft.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X22624. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.