Boeing 777-222 accident near London, Uk, December 13, 1999
On December 13, 1999, a Boeing 777-222, registered N786UA, was involved in an accident near London. It was a flight of an unrecorded kind under scheduled airline rules (Part 121). 1 person was seriously injured and 5 people had minor injuries; 185 others were unhurt. The weather was instrument conditions (cloud, fog or low visibility).
The NTSB's probable cause their words, unchanged
The NTSB has not yet published a probable cause for this accident. Investigations usually take one to two years; this page updates when the final report is released.
Source: NTSB aviation accident database, copy made October 12, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- December 13, 1999 · cases in 1999
- Place
- London, United Kingdom
- Type
- Accident
- Injuries
- 1 person was seriously injured and 5 people had minor injuries; 185 others were unhurt.
- Weather
- instrument conditions (cloud, fog or low visibility)
- Aircraft
- Boeing 777-222 · all 777-222s on the register
- Registration
- N786UA · registry record
- Damage
- Not recorded
- Flight
- Flight of an unrecorded kind · scheduled airline rules (Part 121)
The factual record from the NTSB's investigation tables, in plain English
The aircraft
- Last inspection: inspection type not recorded
- Landing gear: fixed
- Operator: United Air Lines Incorporated
The flight
- Departed from: ORD Chicago IL
- Destination: LHR
- Flight plan: IFR
- Runway 0
Weather at the time
- Light: not reported
- Sky: not recorded; not recorded
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | 5 | 10 | |
| Passengers | 175 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Other NTSB records under N786UA the same tail number, which may have belonged to a different aircraft at the time
Connections how this case links to the rest of the register
- N786UA on the register today · the tail number may have moved to another aircraft since
- Boeing 777 358 registered today · the model family and its accident history
- Boeing 6,672 aircraft on the register
- Chicago O'Hare International · departed from
- Other NTSB records under N786UA 1 records · the number may have belonged to another aircraft at the time
The whole map of how records connect · these connections as data: /graph/accident/CHI00WA045.json.
The bigger picture in Aviation Analytics: accidents over time since 1982, by model, by phase of flight and conditions, by place and on the map.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text does not name anyone involved, its policy at this time. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.