Aircraft collision with electrical transmission wires in valley

Casualties unknown • Strathmore, CA, US

An aircraft crashed after striking high-tension electrical transmission wires spanning a valley, resulting in the discovery of wreckage near severed power lines.

What happened

The aircraft departed a local airport on the morning of the accident. After the pilot failed to return home by nightfall, a family member notified authorities that the pilot was missing. An ALNOT was issued approximately 30 minutes after the report. The wreckage was located the following morning beneath high-tension electrical power transmission lines.

The site contained portions of the left wing and a severed skyline wire. Two sets of electrical wires, spaced about 50 feet apart, cross the valley in a northwest-southeast direction with an open span of 5,190 feet. At the center of the valley, these wires are suspended approximately 175 feet above the valley floor.

The investigation

An inspection of the aircraft revealed that the leading edge of the left wing had an impact mark featuring a rust-colored, braided appearance similar to the skyline wire. A similar scrape was found on the lower spar cap of the left wing that remained attached to the airplane. Additionally, a circular gouge was identified on the leading edge of one propeller blade; the diameter of this gouge matched the end of the severed wire. An on-scene inspection of the airframe and powerplant showed no mechanical discrepancies.

Frequently asked questions

What happened in the 1999-09-09 Piper PA-22-150 accident near Strathmore, CA?

An aircraft crashed after striking high-tension electrical transmission wires spanning a valley, resulting in the discovery of wreckage near severed power lines.

What aircraft was involved and where did it happen?

The accident on 1999-09-09 involved a Piper PA-22-150, registration N1775P, at Strathmore, CA.

What was the probable cause of the accident?

The failure of the pilot to maintain an adequate terrain and obstacle clearance altitude, which resulted in a collision with power transmission wires.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X19789. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.

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