United Airlines Flight 1218
Boeing 757-222 · Accident: uncontrolled altitude deviation en route
From Vancouver International Airport (YVR) to Chicago O'Hare International Airport (ORD)
Event
- NTSB case
- CHI93LA224
- 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
- 0
- 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 757-222
- Aircraft type
- Boeing 757
- 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
- N579UA
- Operator
- United Airlines
- Onboard fatalities
- Unknown
- Route
- From Vancouver International Airport (YVR), VancouverTo Chicago O'Hare International Airport (ORD), Chicago, IL
- Aircraft age
- Not recorded
- 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 · descent
- First occurrenceThe 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
- Uncontrolled altitude deviation
- 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
- Weather condition › Turbulence in clouds
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE AIRPLANE WAS DESCENDING ON A VECTOR FOR LANDING ON RUNWAY 14R AT CHICAGO O'HARE INTERNATIONAL AIRPORT. PASSING THROUGH FLIGHT LEVEL 290 THERE WAS A SHORT ENCOUNTER WITH MODERATE TURBULENCE WHILE STILL IN THE CLOUDS. ONE FLIGHT ATTENDANT FELL AND INJURED HER ANKLE DURING THE ENCOUNTER. WHEN SHE WAS TREATED FOR THE INJURY, IT WAS DISCOVERED THAT SHE HAD SUSTAINED A FRACTURED ANKLE.
Probable cause
an encounter with moderate turbulence in the clouds.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CHI93LA224
- Event ID
- 20001211X12582
- Case number
- CHI93LA224
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (5)
- 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 local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: a37355ee3fde33805fc2b9908327c36256a6b8320f3576b7bcde69fba15c317b; retrieved 2026-09-18T18:33:52.728Z.
- The NTSB's operator name is blank for N579UA; the operator shown is the name the NTSB's other records give its FAA operator code, UALA.