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Atlas / NTSB / DCA23LA382

NTSB CAROL · Event

Event DCA23LA382

2023-07-28 Myrtle Beach, Atlantic Ocean, United States Serious 1 aircraft Status: Completed

Registry · N77431

FAA Aircraft Registry record.

Make / Model

BOEING 737-924ER

Year of manufacture

2009 · 14 years old at event

Engine

CFM INTL CFM56-7B26/3

Seats / Engines

191 seats · 2 engines

Last airworthiness date

20090129

ADS-B equipped

Yes — Mode-S AA7ABE

Registrant of record

UNITED AIRLINES INC

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

An encounter with convectively induced turbulence (CIT) while in cruise flight.

Factual narrative

United Airlines flight 2122 encountered severe turbulence while in cruise flight at flight level (FL) 330 enroute to Punta Cana Airport (PUJ), Dominican Republic, and a flight attendant (FA) sustained serious injuries. The flight crew reported that after reaching a cruise altitude of FL330 and before entering oceanic airspace they downloaded the latest Weather Services International (WSI) radar image, lightning data, and SkyPath ride reports. The airborne radar was in use which depicted some very small, scattered cells well below their altitude. Shortly thereafter, the captain visually acquired a cloud buildup immediately ahead and below their altitude. With no visual indication of the cloud on the weather radar they made a right turn to avoid any potential turbulence. While in the right turn, the airplane entered visual meteorological conditions and the captain visually acquired another cloud buildup directly ahead. To avoid the buildup the captain continued the right turn to no avail. The airplane entered the clouds and immediately encountered severe turbulence for about 5 seconds. A public address (PA) announcement was immediately made “be seated immediately, be seated immediately”. Following the turbulence encountered the flight crew was notified that two aft FAs had been injured. Just before the turbulence event, the number 2L and 2R FAs had moved the beverage cart to the aft galley, so the 2R FA could use the lavatory. After entering the lavatory, she was thrown into the air and landed on her left ankle and knee. The 2L FA stated that as soon as the 2R FA entered the lavatory, they encountered severe turbulence. She and the beverage cart were tossed into the air, and she impacted the floor of the airplane on her left side. She stated that the impact was like “slamming down from a 5th floor building”. Upon being notified of the injuries, the flight crew declared an emergency and diverted to Myrtle Beach, South Carolina, for medical assistance. The two injured FAs were transported to local hospitals where one was diagnosed with serious injuries. At the time of the turbulence encounter there were no active significant meteorological information (SIGMETs), convective SIGMETs, airman’s meteorological information (AIRMETs), or pilot reports (PIREPs) of any significant turbulence. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).

  • Environmental issues-Conditions/weather/phenomena-Turbulence-Convective turbulence-Effect on personnel
  • Environmental issues-Conditions/weather/phenomena-Turbulence-Convective turbulence-Awareness of condition
  • Personnel issues-Experience/knowledge-Knowledge-Knowledge of meteorologic cond-Flight crew

Verbatim from NTSB's published report. Source file NTSB_2023_DCA23LA382.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

Related research

What the literature says.

Academic papers and agency reports matching this event's aircraft type or causal vocabulary (turbulence). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.

Browse the full corpus — academia portal ↗