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last mo.

NTSB Report Details 2.5-Minute Turbulence Upset After Delta Jet Entered Storm’s Core

A final determination will follow 12 to 18 months of analysis of cockpit voice and flight data.

Plane service carts, food items thrown about after turbulence onboard Delta Flight 56.
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Emergency crews at Minneapolis-Saint Paul International Airport after Delta Air Lines Flight 56 made an emergency landing.
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Overview

  • The Airbus A330 encountered violent convective turbulence near Creston, Wyoming at cruise altitude, with the upset lasting about 2.5 minutes.
  • Flight data show an overspeed, an autopilot disconnect, vertical accelerations peaking near +1.75 g and about -0.5 g, and bank angles up to roughly 40 degrees.
  • The seatbelt sign had been switched off and cabin service was underway, sending unrestrained passengers, crew and service carts into the air.
  • After landing in Minneapolis, 24 passengers were evaluated and 18 were taken to hospitals; two cabin crew sustained serious injuries and five had minor injuries.
  • NTSB mapping indicates the jet flew into the most intense radar return despite deviation requests, and investigators continue reviewing the recorders with participation from the FAA, Delta, ALPA, BEA and Airbus.