United Airlines Flight 128
Boeing 767-322 · Accident: turbulence encounter en route
From Rio de Janeiro to Houston, TX
Event
- NTSB case
- DCA25LA023
- 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
- Event fatalities
- Unknown
- 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
- Visual Meteorological Cond
Boeing 767-322
- Aircraft type
- Boeing 767
- 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
- N651UA
- Operator
- United Airlines
- Onboard fatalities
- Unknown
- Route
- From Rio de JaneiroTo Houston, TX
- Aircraft age
- About 32 years (built 1992)
- 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
No findings designated as a cause are recorded in the NTSB data yet.
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
United Airlines flight 128 encountered moderate turbulence while at FL360 and about 60 miles southeast of Jamaica, and a flight attendant (FA) sustained a serious injury. The flight crew reported that while at FL360, in visual meteorological dark night conditions with no indication of an adverse ride from their onboard weather applications or their weather radar, the flight encountered about 3-5 seconds of moderate turbulence. The fasten seatbelt sign had been illuminated about 15 minutes earlier due to an area of light turbulence and remained illuminated during the event. The captain stated that upon encountering the moderate turbulence he immediately made a public address announcement “flight attendants be seated immediately, be seated immediately”. Following the turbulence encounter the flight crew asked the flight attendants to check in and were advised that a FA had been injured. The FA assigned to jumpseat 2R reported that they had been seated with their seatbelt fastened for about 10-15 minutes due to a previous announcement from the fight deck about an area of light turbulence. With no turbulence encountered for several minutes the FA elected to stand and began preparations for the water service. When suddenly and without warning, the airplane “violently shook” throwing them into the right galley wall. Their lower back impacted a quarter turn utilized to secure the service carts. Upon being notified of the injury, the flight crew contacted MedLink and the decision was made to continue to George Bush International Airport (IAH), Houston, Texas. Paramedics met the airplane at the gate and transported the injured FA to the hospital where they were diagnosed with a serious injury. 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.
Probable cause
An inadvertent encounter with convective turbulence while in enroute cruise flight.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DCA25LA023
- Event ID
- 20241105195439
- Case number
- DCA25LA023
- 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, coordinates, 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: 6fecffb6620ef4c102d4a8519a6b217563a3de277a4d199b0d247ba60d4f793d; retrieved 2026-09-16T19:26:45.274Z.