Casualties unknown

Aircraft Strikes Terrain in Box Canyon During Sheep-Locating Flight (N4996V)

Anaktuvuk Pass, AK, US

On August 7, 1999, a Piper PA-18-150 (registration N4996V) was involved in an aviation accident near Anaktuvuk Pass, AK. Investigators recorded the probable cause as: The inadvertent stall/spin by the pilot. A factor was the box canyon into which he had flown. 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 2026-06-10Data APIEditorial standards

A flight from a remote hunting camp to locate sheep ended in a crash when the aircraft struck terrain in a near-vertical attitude and came to rest inverted in a box canyon. The wreckage was located the following day after the flight was reported overdue.

Accident Overview

The flight departed a remote hunting camp, approximately 25 miles north of the accident site, with the purpose of locating sheep before dropping off the passenger. The flight was reported overdue to the Alaska State Troopers, prompting an aerial search that located the wreckage the following day.

Accident Details

The aircraft struck terrain in a near-vertical attitude and came to rest inverted at the bottom of a box canyon. The empennage was rotated and twisted to the right. A postcrash fire consumed both fuel tanks and the fuselage.

Weather Conditions

At the time of the accident, visual meteorological conditions prevailed at the nearest reporting station, located 60 miles south of the accident site. One of the pilot's employees reported to the NTSB investigator-in-charge that winds at the camp were calm, with some clouds visible to the south and the tops of the mountains visible toward the accident site.

Examination Findings

Postaccident examination of the airplane and engine revealed no preaccident anomalies.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X19393. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.