Investigation Summary
On the afternoon of July 9, 1982, Pan Am Flight 759 was departing New Orleans for Las Vegas during a period of building thunderstorm activity. Although the airport's Low-Level Wind Shear Alert System (LLWSAS) had triggered several alerts, the readings indicated relatively minor wind differentials that did not prohibit takeoff. As the Boeing 727, named 'Clipper Defiance', lifted off from Runway 10, it flew directly into a microburst, a localized column of sinking air. The aircraft first experienced an increasing headwind, which improved performance, followed by a massive downdraft and a sudden tailwind. This sequence robbed the aircraft of lift at a critical, low-altitude phase. Despite the crew's attempts to climb, the aircraft struck trees and houses in the suburb of Kenner, approximately 4,600 feet from the end of the runway.
Final Conclusions
The NTSB determined the probable cause was the aircraft's encounter with microburst-induced wind shear, which the pilot could not detect or recover from in time. Contributing to the accident was the limited capability of the then-current wind shear detection technology, which failed to provide sufficiently detailed or timely warnings of the severe localized conditions. The investigation also noted that the crew followed standard procedures but were essentially flying into an invisible meteorological trap that exceeded the performance capabilities of the aircraft at that altitude and configuration.
Video Analysis
The Crash of Pan Am Flight 759: Microburst and Wind Shear Analysis — This video examines the 1982 crash of a Boeing 727 in Kenner, Louisiana, caused by a severe microburst. It details the resulting safety mandates for airborne wind shear detection and Doppler radar systems.
Watch on YouTube ↗If playback is blocked, the owner has disabled embedding — use the link above.
Systems & Failure Modes
LLWSAS
Low-Level Wind Shear Alert System; a ground-based array of anemometers used to detect wind speed differences across the airport.
GPWS
Ground Proximity Warning System; alerted the crew to the impending collision with the ground, though too late for recovery.
Weather Radar
Onboard radar used by the pilots; it showed level 2 cells, which were considered manageable and not indicative of the severe microburst.
Interesting Facts
- 01The crash was the second-deadliest aviation accident in U.S. history at the time it occurred.
- 02Eight people on the ground were killed, including a mother and her baby who were found in a bathtub.
- 03The aircraft was 14 years old and had previously served with National Airlines before the merger with Pan Am.
- 04The microburst caused a wind speed differential that significantly exceeded the aircraft's ability to maintain flight.
- 05One passenger, a 16-month-old girl, was initially reported as a survivor on the ground but the final report confirmed 153 total fatalities.
Safety Actions & Advisories
Terminal Doppler Weather Radar (TDWR)
The accident accelerated the development and deployment of TDWR, which provides much higher resolution wind shear detection than the original LLWSAS.
Airborne Wind Shear Detection
The FAA mandated the development of predictive wind shear systems for commercial aircraft to warn pilots before they enter a microburst.
Pilot Training for Wind Shear
Training programs were overhauled to teach pilots to recognize the signs of wind shear and to use specific 'wind shear recovery' techniques, such as flying at the stick shaker limit.