Narrative:Flight 940 took off from Mexico City (MEX) at 08:40 for a flight to Puerto Vallarta (PVR), Mazatlán (MZT) and Los Angeles (LAX). The left main gear brake was overheated during the take-off run. When the aircraft had reached FL310 the heat caused a tyre on the left hand main gear to explode. Fuel and hydraulic lines were ruptured and electrical cables severed resulting in a cabin decompression. An emergency was declared, but spilt fuel ignited and caused a massive fire on board. Control was lost and the aircraft crashed into a mountain in the Sierra Madre, at an elevation of 9000 feet. It was found that the tire had been serviced with air rather than nitrogen. The air, under high temperature and pressure, resulted in a chemical reaction with the tire itself. This led to a chemical explosion of the tire.
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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not
display the exact flight path.
Distance from Mexico City-Benito Juárez International Airport to Puerto Vallarta-Gustavo D. Ordaz Airport as the crow flies is 656 km (410 miles).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.