LANSA Flight 502

LANSA Flight 502 was a Lockheed L-188A Electra operated by Líneas Aéreas Nacionales Sociedad Anónima (LANSA) which crashed shortly after takeoff from Quispiquilla Airport near Cusco, Peru, on August 9, 1970, after losing all power from one of its four engines. The turboprop airliner, registered OB-R-939, was bound from Cusco to Lima, carrying 8 crew and 92 passengers. All but one of the occupants died from injuries sustained from impact forces and post-crash fire. Two people on the ground were also killed. There were 49 American high school exchange students on board, all of whom perished. A Peruvian government investigation concluded that the accident was caused by improper execution of engine-out procedures by the flight crew and lack of proper maintenance. LANSA was fined and its operations were suspended for 90 days. At the time, the crash was the deadliest ever in Peruvian history before being surpassed by Faucett Perú Flight 251 in 1996.

Background

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 after a visit to the nearby Machu Picchu to their host families in the Lima area. The daughter of the mayor of Lima was also accompanying the group. The Peruvian passengers included a couple on their honeymoon.

August 9, 1970, was a Sunday, and Flight 502 was originally scheduled to depart Cuzco at 8:30 am, 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.

Quispiquilla Airport, since renamed to Alejandro Velasco Astete International Airport, is located about 3 mi east-southeast of the city of Cusco, in a small valley high on the Andes, at an elevation of 10860 ft above mean sea level. 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.

Crash

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 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. The number three engine was engulfed in flames as the crew incorrectly retracted the flaps and maneuvered the plane into a left turn back to the runway. The plane entered a 30° to 45° bank, then rapidly lost altitude and crashed into hilly terrain about 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, who was found in the wreckage of the cockpit badly burned but alive. Two farm workers were killed on the ground.