Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
London
Monday, February 26, 2007 10:00 UTC
NTSB Narrative Summary Released at Completion of Accident
On February 26, 2007, a Boeing 777 -200B, N786UA, operated by United Airlines as flight 955, a Title 14 CFR Part 121 scheduled passenger flight, from London (Heathrow) to San Francisco, California, experienced an electrical fire during taxi for departure at London Heathrow Airport (LHR). The aircraft was taxied to a nearby stand, and the passengers deplaned via steps. There were no injuries to the 20 crew members and 185 passengers on board. The accident is being investigated by the Air Accidents Investigation Branch of the United Kingdom. A U.S. team, consisting of the Accredited Representative, and technical advisors from the FAA, and Boeing traveled to the scene to assist in the investigation.
After engines start, about the time the engine driven Integrated Drive Generators (IDGs) would normally come on-line, the flight deck instrument displays flickered, the crew heard an abnormal noise and an EICAS message, amongst other related messages, indicated that the Right Main AC Bus had failed. Some 40 seconds after the engines had stabilized at ground idle, the smoke detector in the Main Equipment Center (MEC), located beneath the flight deck and forward vestibule, detected smoke. About two and a half minutes after the electrical failure, the crew became aware of a faint smell of electrical burning on the flight deck, following which the right engine was shut down. The crew were alerted by the ground handling crew that smoke was seen to be coming from the MEC vent and, a couple of minutes later, ATC also advised that smoke had been seen coming from the aircraft. The aircraft was taxied to a nearby stand, where the left engine was shut down. Approximately twelve and a half minutes after the failure, the batteries were switched off and the passengers deplaned via steps.
NTSB Probable Cause Narrative
Not Yet Reported
Event Information
| Type of Event | Accident |
| Event Date | 2/26/2007 |
| Event Day of the Week | Monday |
| Time of Event | 1000 |
| Event Time Zone | Coordinated Universal Time? Same as GMT |
| Event City | London |
| Event State | -- |
| Event Country | -- |
| Zipcode of the event site | -- |
| Event Date Year | 2007 |
| Event Date Month | 2 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | -- |
| Event Location Longitude | -- |
| Event Location Airport | -- |
| Event Location Nearest Airport ID | -- |
| Indicates whether the acc/inc occurred off or on an airport | -- |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | -- |
| Investigator's weather source | -- |
| Time of the weather observation | |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | -- |
| Elevation of weather observation facility | -- |
| Distance of event from weather observation facility (units?) | -- |
| Time Zone of the weather observation | -- |
| Lighting Conditions | -- |
| Lowest Ceiling Height | -- |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | -- |
| Sky Condition for Lowest Ceiling | -- |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | -- |
| Air Temperature at event time (in degrees celsius) | -- |
| Dew Point at event time (in degress fahrenheit) | -- |
| Wind Direction (degrees magnetic) | -- |
| Variable Wind Indicator | -- |
| Wind Speed (knots) | -- |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | -- |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | -- |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 205 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | Foreign |
| NTSB Docket Number (internal use) | -- |
| NTSB Notification Source | Jeff Plants - UAL |
| NTSB Notification Date | Feb 26 2007 12:00AM |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | -- |
| Date of most recent change to record | Jun 17 2009 8:34AM |
| User who most recently changed record | johb |
| Basic weather conditions | -- |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N786UA |
| NTSB Number | ENG07RA014 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 121: Air Carrier |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | -- |
| Damage | Substantial |
| Aircraft Fire | -- |
| Aircraft Explosion | -- |
| Aircraft Manufacturer's Full Name | BOEING |
| Aircraft Model | 777-200B |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | -- |
| Certified Max Gross Weight | -- |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | -- |
| Number of Engines | -- |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | -- |
| Date of Last Inspection | -- |
| Airframe hours since last inspection | -- |
| Airframe Hours | -- |
| ELT Installed | Unknown |
| ELT Activated | Unknown |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | -- |
| Aircraft Owner Street Address | -- |
| Aircraft Owner City | -- |
| Aircraft Owner State | -- |
| Aircraft Owner Country | -- |
| Aircraft Owner Zipcode | -- |
| Operator is an individual? | -- |
| Operator Name | -- |
| Operator Same as Owner? | -- |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | -- |
| Operator Street Address | -- |
| Operator City | -- |
| Operator State | -- |
| Operator Country | -- |
| Operator Zip code | -- |
| Operator Code | UIYS |
| Owner has at least one certificate | -- |
| Other Operator of large aircraft? | -- |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | Scheduled |
| Indicates Domestic or International Flight | International |
| Operator carrying Pax/Cargo/Mail | Passenger Only |
| Type of Flying (Per_Bus / Primary) | -- |
| Second Pilot on Board | -- |
| Departure Point Same as Event | Yes |
| Departure Airport Code | LHR |
| Departure City | London |
| Departure State | -- |
| Departure Country | UK |
| Departure Time | -- |
| Departure Time Zone | UTC |
| Destination Same as Local Flt | -- |
| Destination Airport Code | SFO |
| Destination City | San Francisco |
| Destination State | CA |
| Destination Country | USA |
| Specific Phase of Flight | Taxi - to takeoff |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jul 1 2009 9:25AM |
| User who most recently changed record | johb |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | -- |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |