Delta Air Lines Flight 191

Delta Air Lines Flight 191. This scheduled domestic passenger flight, operated by a Lockheed L-1011 TriStar, crashed while attempting to land during a severe thunderstorm on August 2, 1985. The accident occurred near Dallas/Fort Worth International Airport, resulting in 137 fatalities. The subsequent investigation by the National Transportation Safety Board led to major changes in aviation safety procedures and weather training.

Accident

On the afternoon of August 2, 1985, the aircraft departed Fort Lauderdale–Hollywood International Airport for a flight to Los Angeles International Airport with a scheduled stop at Dallas/Fort Worth International Airport. As the flight approached the Dallas–Fort Worth metroplex, it encountered a rapidly developing thunderstorm complex. The crew, communicating with controllers from the Federal Aviation Administration, was vectored for a landing on runway 17L. While descending through the storm's rain shaft, the aircraft experienced a severe wind shear event, specifically a powerful microburst. This violent downdraft and subsequent outflow caused the airspeed to drop dramatically, followed by a sharp increase. The pilots' attempts to recover were unsuccessful. The jet first struck a car on State Highway 114, killing the driver, then collided with two water tanks before crashing into a field approximately 6,000 feet north of the runway. The impact and resulting post-crash fire destroyed the fuselage.

Investigation

The National Transportation Safety Board launched an extensive investigation, which became one of the most significant in aviation history. The inquiry utilized data from the flight data recorder and cockpit voice recorder, along with extensive meteorological analysis and witness testimony. Investigators determined the probable cause was the flight crew's decision to initiate and continue an approach into an area of severe convective activity, which contained a hazardous microburst. This led to an encounter with low-altitude wind shear from which the crew could not recover. A major contributing factor was the lack of definitive, real-time hazardous wind shear information for pilots. The investigation highlighted limitations in the Federal Aviation Administration's training and guidelines for avoiding and escaping wind shear. It also scrutinized the performance of the aircraft's weather radar and crew resource management during the critical approach phase. The findings underscored a systemic failure in how the aviation community understood and communicated the dangers of microbursts.

Aftermath and legacy

The crash of this flight had a profound and lasting impact on commercial aviation safety. The National Transportation Safety Board issued numerous recommendations, which prompted the Federal Aviation Administration and NASA to accelerate research into wind shear detection systems. This led to the development and mandatory installation of Terminal Doppler Weather Radar at major U.S. airports and the implementation of airborne forward-looking wind shear detection systems on commercial aircraft. Additionally, pilot training programs were revolutionized with the introduction of mandatory wind shear recovery simulator training. The accident also spurred improvements in cockpit voice recorder and flight data recorder technology and duration requirements. Memorials to the victims were established in Dallas and at the crash site. The lessons learned fundamentally changed how pilots, air traffic controllers, and meteorologists interact during convective weather, making the recognition and avoidance of microbursts a cornerstone of modern flight safety. Category:Aviation accidents and incidents in the United States Category:Delta Air Lines accidents and incidents Category:1985 in Texas Category:1985 aviation accidents