United Air Lines Boeing 737 824 accident
Boeing 737 824 · Accident: turbulence encounter en route
From Sarasota Bradenton International Airport (SRQ) to Chicago O'Hare International Airport (ORD)
Event
- NTSB case
- DCA15CA035
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- Airline
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Instrument Meteorological Cond
Boeing 737 824
- Aircraft type
- Boeing 737
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N16217
- Operator
- United Air Lines
- Onboard fatalities
- Unknown
- Route
- From Sarasota Bradenton International Airport (SRQ), Sarasota, FLTo Chicago O'Hare International Airport (ORD), Chicago, IL
- Aircraft age
- About 16 years (built 1998)
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 121: Air Carrier
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- En route · cruise
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Turbulence encounter
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- None
Cause areas
- Environmental issues › Conditions/weather/phenomena
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
While in cruise at FL340 and experiencing occasional light chop, the flight crew was notified by ATC of pilot reports of moderate turbulence along their route of flight. The seatbelt sign was on and the captain advised the flight attendants (FA) to stow galley carts and be seated. The first officer subsequently made a PA announcement to advise passengers to remain seated with seatbelts fastened and for FAs to be seated immediately. Soon after this, the airplane encountered turbulence, categorized by the flight crew as severe, which resulted in altitude fluctuation ± 300 feet. The FAs were in the process of returning the meal service carts to the aft galley when the turbulence was encountered and reported that they, along with the service carts, were lifted off the floor about three times. One FA reported being thrown into the ceiling and back to the seats and floor. The lead FA advised the flight crew that some of the passengers and FAs had received minor injuries but none requested medical attention. The flight continued to ORD and landed uneventfully and emergency medical met the airplane at the gate as a precautionary measure. After returning home, one flight attendant was diagnosed with a fractured lumbar vertebra.
Probable cause
an inadvertent encounter with clear air turbulence while the flight attendants were returning to their seats.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DCA15CA035
- Event ID
- 20141211X62917
- Case number
- DCA15CA035
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status, damage. Values present in the bulk record are kept.
- The date is the UTC date the NTSB stores; the local time zone is not recorded, so the local date may differ by a day.
- API snapshot SHA-256: c37e1536a88051ef245091f5f166c925539be56f7b803efe0cef1f53a1f76acd; retrieved 2026-09-16T01:58:46.457Z.