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| Date: | Monday 30 September 2024 |
| Time: | |
| Type: |  Boeing 777-222ER |
| Owner/operator: | United Airlines |
| Registration: | N788UA |
| MSN: | 26942/82 |
| Year of manufacture: | 1997 |
| Engine model: | P&W PW4090 |
| Fatalities: | Fatalities: 0 / Occupants: 229 |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Location: | 148 nm NW of Calgary, AB -
 Canada
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | London-Heathrow Airport (LHR/EGLL) |
| San Francisco International Airport, CA (SFO/KSFO) | |
| Investigating agency: | TSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
United Airlines flight UA949, a Boeing 777-222ER, was en route in cruise, approximately 148 nm NW of Calgary International Airport (CYYC), AB, when the flight crew noticed a faint but consistent electrical odor. Checklists were actioned, and the pilots made an assessment of electrical devices in the cabin with no immediate findings.
The flight attendants and passengers reported that the electrical odor was coming from the forward cabin area. The flight crew declared an emergency and diverted to CYYC where the aircraft landed without further incident.
Sources:
TSB
History of this aircraft
Other occurrences involving this aircraft
| 10 February 2024 | N788UA | United Airlines | 0 | near Kelsey, NY |  |
non |
| Turbulence | ||||||
| 28 September 2025 | N788UA | United Airlines | 0 | London Heathrow Airport |  |
non |
| Engine failure | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Oct-2024 16:28 | ASN | Added |
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