On August 7, 2003, a Mcdonnell Douglas DC-9-81 (registration N814ME) was involved in an aviation accident near Greeley, CO. Investigators recorded the probable cause as: the inflight encounter with severe turbulence. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
During cruise at 33,000 feet, an aircraft encountered severe turbulence after entering an unavoidable cumulus cloud, causing serious injuries to two flight attendants and minor injuries to three passengers. Turbulence was not forecasted; seat belt sign was on.
Incident Overview
While cruising at an altitude of 33,000 feet, an aircraft experienced moderate to severe turbulence. The flight was deviating to the south of its planned route to avoid weather conditions. After emerging from a cloud layer, the captain observed a cumulus cloud ahead that could not be avoided.
Encounter with Severe Turbulence
Upon entering the cumulus cloud, the aircraft encountered severe turbulence. The turbulence was not forecasted for the route or area at that time.
Injuries
The severe turbulence resulted in serious injuries to two flight attendants and minor injuries to three passengers. No further details on the nature of the injuries or the total number of occupants were provided.
Safety Measures
The seat belt sign had been illuminated for approximately 20 minutes before the turbulence encounter.