52 Years ago today: On 9 August 1970 a LANSA Lockheed L-188A Electra crashed near Cuzco, killing 99 out of 100 occupants.

Date:Sunday 9 August 1970
Type:Silhouette image of generic L188 model; specific model in this crash may look slightly different
Lockheed L-188A Electra
Operator:Lineas Aéreas Nacionales S.A. – LANSA
First flight:1959-11-12 (10 years 9 months)
Crew:Fatalities: 7 / Occupants: 8
Passengers:Fatalities: 92 / Occupants: 92
Total:Fatalities: 99 / Occupants: 100
Ground casualties:Fatalities: 2
Aircraft damage:Destroyed
Aircraft fate:Written off (damaged beyond repair)
Location:ca 4 km E of Cuzco Airport (CUZ) (https://cdn.aviation-safety.net/database/country/flags_15/OB.gif   Peru)
Phase:Initial climb (ICL)
Nature:Domestic Scheduled Passenger
Departure airport:Cuzco-Velazco Astete Airport (CUZ/SPZO), Peru
Destination airport:Lima-Jorge Chávez International Airport (LIM/SPIM), Peru

LANSA Flight 502 from Cuzco to Lima, was originally scheduled to depart Cuzco at 08:30. Departure time was postponed to 14:45.
During the takeoff run, which was 700 m longer than normal, the no. 3 engine failed. The aircraft continued to climb at a speed of V2+15 knots. After retracting the flaps at 300 feet, the Electra turned left at a speed of 140 knots with a bank angle of 30-45 degrees. The aircraft contacted the ground during this turn and crashed. Two farmers were killed on the ground.
Probable Cause:

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.