NTSB Identification: OPS10IA020A
Scheduled 14 CFR Part 121: Air Carrier
Incident occurred Saturday, March 27, 2010 in San Francisco, CA
Probable Cause Approval Date: 12/19/2011
Aircraft: BOEING 777-222, registration: N216UA
Injuries: 268 Uninjured.
NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.
An operational error occurred when a Boeing 777 and a Cessna 182 transiting the Class B surface area passed within approximately 480 feet laterally and 300 feet vertically of each other. Both airplanes were under control of air traffic control at the time of the incident.
Postincident investigation determined that the local controller issued a takeoff clearance to the Boeing 777 without resolving a potential conflict with the Cessna, which was southbound just west of the airport. The controller attempted to establish approved separation between the two airplanes after the Boeing departed, but was unable to do so. The pilot of the Cessna took evasive action to pass behind the Boeing. Review of tower procedures revealed deficiencies that permitted aircraft to cross the runway 28L/R departure corridor while the runways were active, facilitating conflicts of this nature.
The National Transportation Safety Board determines the probable cause(s) of this incident to be: The local controller's issuance of a takeoff clearance to the Boeing 777 without ensuring that approved separation would exist with the Cessna 182. Contributing to the incident were tower procedures that permitted transitioning aircraft to cross the runway 28 departure corridor at low altitude while runways 28L/R were in use. Full narrative available
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