LANSA Flight 502

More than half of the passengers belonged to a single group, sponsored by the Buffalo, New York, based International Fellowship student exchange program, consisting of 49 American high school exchange students, along with their teachers, family members, and guides, who were returning from a visit to nearby Machu Picchu to their host families in the Lima area. The daughter of the mayor of Lima was also accompanying the group.[3] The Peruvian passengers included a couple on their honeymoon.[4]

Students boarding the doomed flight

August 9, 1970 was a Sunday, and Flight 502 was originally scheduled to depart Cuzco at 8:30 am,[5][6][7] but since many of the members of the American group wanted to visit the nearby Pisac native handicraft market prior to leaving for Lima, the airline postponed the departure time to 2:45 pm.[7]

Quispiquilla Airport, since renamed to Alejandro Velasco Astete International Airport, is located about 4.8 kilometres (3 mi) east-southeast of the city of Cusco, in a small valley high on the Andes, at an altitude of 3,310 metres (10,860 ft) above mean sea level.[8] Higher mountainous terrain surrounds the single east-west runway airport in all directions. Since it was August, it was winter time in Peru, as in the rest of the southern hemisphere.

At about 2:55 pm, the four-engine Electra turboprop began its takeoff run to the west. At some point during the takeoff run or initial climb, the number three engine[9] failed and caught fire. The crew continued the takeoff and climb, per standard procedure, using power from the remaining three engines. The pilot radioed the control tower declaring an emergency, and the control tower cleared the flight for an immediate landing.[3] The number three engine was engulfed in flames as the crew retracted the flaps and maneuvered the plane into a left turn back to the runway.[1] The plane entered a 30–45 degree bank, then rapidly lost altitude and crashed into hilly terrain about 2.4 kilometres (1.5 mi) west-southwest of the runway, above the village of San Jerónimo. The fuel on board caught fire and all aboard perished except the copilot, 26-year-old Juan Loo,[10] who was found in the wreckage of the cockpit badly burned but alive. Two farm workers were killed on the ground.

Map of Peru depicting Flight 502 origin and destination

The Peruvian government investigated the accident, and in its final report concluded that the probable cause of the accident was the improper execution of engine-out procedures by the flight crew, with contributing factors of improper loading of the aircraft and improper maintenance procedures by company personnel.[1] There was also evidence of a coverup and falsification of critical maintenance records by LANSA employees during the investigation process. The Peruvian government subsequently fined LANSA and some of its employees, and suspended the airline's operating license for 90 days as a consequence.[2][11]

About a year after the accident, a monument—a large white cross with an attached nameplate—was erected on the spot of the crash site to commemorate the victims of LANSA flight 502. In 2006, because of encroaching development, the Peruvian owner of the land where the memorial was originally located, under pressure from the U.S. Senator from New York, Charles E. Schumer, the U.S. Department of State and the U.S. Consulate General in Peru, agreed to relocate[12] the memorial 46 m (150 ft) away to protect the site.[13]

• LANSA Flight 501
• LANSA Flight 508
• List of accidents and incidents involving commercial aircraft

• Cusco Airport Satellite Photo
• Air Disaster Accident Record
• archive.org record of accident web site
• Hi-res image of the crash monument as it appeared in January 2017