Investigation Summary
The flight was a multi-leg journey from Caracas to Miami. During the stopover in Maracaibo, the aircraft was refueled with 12,000 kg of jet fuel and took on additional passengers. The investigation revealed that the crew relied on faulty temperature sensors located along the runway. These sensors reported a temperature significantly lower than the actual 38 degrees Celsius ambient air. Consequently, the crew calculated a takeoff weight and performance profile that the aircraft could not achieve in the thin, hot air. The DC-9 required more runway than was available and struggled to climb once airborne. The left engine struck a power pole, and a subsequent collision with a reflector ruptured a fuel tank, leading to a massive fire and loss of control.
Final Conclusions
The disaster was primarily caused by the use of erroneous environmental data for takeoff calculations, leading to an aircraft weight that exceeded the safe performance limits for the runway length and high ambient temperature. Secondary factors included the lack of a clearway at the end of Runway 04L and the close proximity of dense residential neighborhoods to the airport perimeter.
Video Analysis
This Pilot Refused to Fly, But Another Did… And Tragedy — An exploration of the events surrounding VIASA Flight 742, one of the deadliest aviation disasters in Venezuelan history, focusing on the takeoff performance errors at Maracaibo.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Systems & Failure Modes
Runway Temperature Sensors
Faulty sensors provided the crew with a lower-than-actual temperature reading, leading to incorrect engine thrust and weight calculations.
Pratt & Whitney JT8D-7 Engines
The engines could not produce enough thrust for the 90,000-pound aircraft weight in the 38°C heat, resulting in insufficient climb performance.
Interesting Facts
- 01The aircraft was a brand new DC-9-32, manufactured in 1969 and delivered only weeks before the crash.
- 02The crash killed 71 people on the ground, nearly doubling the total death toll.
- 03The aircraft was estimated to be overloaded by more than 5,000 pounds for the actual atmospheric conditions.
- 04Among the fatalities was Néstor Chávez, a pitching prospect for the San Francisco Giants.
- 05The accident was the deadliest civil aviation disaster in history at the time it occurred.
Safety Actions & Advisories
Airport Closure
The Grano de Oro Airport was permanently closed to commercial traffic shortly after the accident due to its dangerous proximity to residential areas.
Infrastructure Acceleration
The construction of the new La Chinita International Airport (Caujarito) was accelerated to replace the hazardous Grano de Oro facility.
Known Controversies & Unanswered Questions
Intentional Overloading Allegation
Reference ↗While the official cause cites faulty sensors, Viasa Captain Luis E. Cañas later alleged the crew was aware of the 38°C temperature but intentionally chose to take off at 90,000 pounds despite a 72,000-pound limit.