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4 fatalities

Mountain Strike in Ayacucho Region (OB-1318)

Ayacucho, PeruFlight

On June 1, 1990, a Cessna 402 (registration OB-1318) operated by Aero Sur was involved in an aviation accident near Ayacucho, Peru in flight. 4 people were killed. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A).

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-11Data APIEditorial standards

A twin-engine aircraft crashed into a mountain slope in the Ayacucho region during bad weather. Search operations were suspended after days, but the wreckage was found by walkers on 28 August 1990.

Incident Overview and Search Efforts A twin-engine aircraft encountered adverse weather conditions while cruising and subsequently struck the slope of a mountain in the Ayacucho region. Because the aircraft did not reach its intended destination, search and rescue (SAR) operations were immediately initiated. However, these efforts were suspended a few days later after no trace of the aircraft could be located. ## Discovery of the Wreckage The wreckage was eventually discovered in an isolated area by walkers on 28 August 1990. The source does not specify the exact aircraft type, registration, operator, or the definitive cause of the accident.

Controlled flight into terrain

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