9 fatalities

US Navy Neptune crash during search and rescue mission (140156)

Mt Granero, ItalyFlight

On July 21, 1957, a Lockheed P-2 Neptune (registration 140156) operated by United States Navy - USN was involved in an aviation accident near Mt Granero, Italy in flight. 9 people were killed. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-12Data APIEditorial standards

A US Navy P-3 Neptune crashed into Mt Granero during a search and rescue operation near the French border, resulting in nine fatalities.

What happened

While conducting a search and rescue mission in the Piedmont region, a US Navy Neptune struck the side of Mt Granero. The flight was part of an ongoing effort to locate another US Navy aircraft that had gone missing two days prior to this incident. During the operation, the aircraft collided with the 3,170-meter peak located near the border between Italy and France.

Findings

The crash resulted in a high number of casualties among those on board. Of the ten people on the aircraft, nine fatalities were recorded. Only one crew member was successfully rescued from the site following the impact.