LANSA Flight 502 was a domestic flight in Peru, operated by the airline LANSA. Shortly after departing from Alejandro Velasco Astete International Airport in Cusco, the aircraft, a Lockheed L-188 Electra, encountered a severe weather front that substantially impacted visibility and aircraft performance. As the flight ascended, the crew lost control of the aircraft, resulting in a fatal crash that killed 99 of the 100 people aboard and also claimed the lives of two individuals on the ground who were struck by debris from the aircraft. This incident stands as one of the deadliest aviation disasters in Peru's history.

The flight's technical issues compounded by challenging mountainous terrain have led to critical reviews of flight operations, safety protocols, and the training of pilots navigating such hazardous conditions. Amid growing pressure from the public and aviation authorities, investigations were launched to determine the causes and contributing factors of the crash. The findings emphasized not only a need for stringent operational standards but also a broader understanding of environmental impacts on aviation.

In the aftermath, the disaster prompted discussions about improving safety measures, both in Peru and globally, especially in areas prone to sudden weather changes. The incident served as a stark reminder of the complex interplay between human error, mechanical failure, and the influence of natural elements in aviation.