Casualties unknown

Power Loss Forces Landing on Reclaimed Strip Mine; Aircraft Inverted (N7816D)

Wise, VA, US

On February 2, 1991, a Piper PA-22-150 (registration N7816D) operated by Robert J Spera was involved in an aviation accident near Wise, VA. Investigators recorded the probable cause as: A broken exhaust valve caused damage in the number three cylinder. 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 pilot on an IFR flight experienced sudden power loss at 5,500 feet. Unable to return to the departure airport, he landed on a reclaimed strip mine. The nose gear collapsed, and the aircraft came to rest inverted, sustaining substantial damage. Engine inspection revealed a broken exhaust valve in cylinder three.

Incident Overview

A pilot had just departed the airport on an instrument flight rules (IFR) flight and was climbing through 5,500 feet when the aircraft suddenly lost significant power. The pilot immediately performed the emergency procedures for loss of power but could not correct the situation. With insufficient power to return to the departure field, the pilot elected to land on a reclaimed strip mine.

Landing and Post-Impact Condition

On touchdown, the nose landing gear broke away, and the aircraft tipped onto its nose before coming to rest inverted. The accident resulted in substantial damage to the aircraft.

Engine Examination

A subsequent inspection of the engine revealed damage in the number three cylinder caused by a broken exhaust valve.

Probable cause

A broken exhaust valve caused damage in the number three cylinder.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X16414. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.