Asiana Airlines Flight 214 crash

Yahoo News

Updated December 10, 2013 at 7:00 PM

A National Transportation Safety Board (NTSB) investigator looks at the tail section of the Asiana Airlines Flight 214 that crashed at San Francisco International Airport in San Francisco, California in this handout file photo released on July 7, 2013. Pilots of the Asiana Airlines Inc plane were aware the plane was traveling too slowly and tried to correct it in the final seconds before impact, according to documents released on December 11, 2013 by U.S. aviation safety investigators. (REUTERS/NTSB/Handout via Reuters)

The National Transportation Safety Board (NTSB) Investigator in Charge Bill English (R) and Chairman Deborah Hersman discuss the progress of the Asiana Airlines flight 214 investigation in San Francisco, California, in this file picture provided by NTSB on July 9, 2013. U.S. safety investigators are looking closely at whether an over-reliance on autopilot systems in modern aircraft has degraded human flying skills, increasing the risk of accidents. At a two-day hearing that starts on December 10, 2013, the NTSB will examine if cockpit complacency caused the Asiana Airlines Inc's jetliner with 307 people aboard to crash land at San Francisco International Airport in July, killing three and injuring more than 180. (REUTERS/NTSB/Handout via Reuters/Files)

An Asiana Airlines Boeing 777 plane is engulfed in smoke on the tarmac after a crash landing at San Francisco International Airport in California July 6, 2013, in this handout file photo provided by passenger Eugene Anthony Rah, released to Reuters on July 8, 2013. U.S. safety investigators are looking closely at whether an over-reliance on autopilot systems in modern aircraft has degraded human flying skills, increasing the risk of accidents. At a two-day hearing that starts on December 10, 2013, the NTSB will examine if cockpit complacency caused the Asiana Airlines Inc's jetliner with 307 people aboard to crash land at San Francisco International Airport in July, killing three and injuring more than 180. (REUTERS/Eugene Anthony Rah/Handout via Reuters/Files)

U.S. National Transportation Safety Board (NTSB) investigators work at the scene of the Asiana Airlines Flight 214 crash site at San Francisco International Airport in San Francisco, California, in this handout file photo released on July 7, 2013. U.S. safety investigators are looking closely at whether an over-reliance on autopilot systems in modern aircraft has degraded human flying skills, increasing the risk of accidents. At a two-day hearing that starts on December 10, 2013, the NTSB will examine if cockpit complacency caused the Asiana Airlines Inc's jetliner with 307 people aboard to crash land at San Francisco International Airport in July, killing three and injuring more than 180. (REUTERS/NTSB/Handout/Files)

In this photo provided by the National Transportation Security Board (NTSB), NTSB investigators conduct a first site assessment overnight of the Asiana Airlines flight 214 that crashed at the San Francisco International Airport in San Francisco, Saturday, July 6, 2013. The Asiana Airlines Boeing 777 crashed while landing after a likely 10-hour-plus flight from Seoul, South Korea. The flight originated in Shanghai and stopped in Seoul before the long trek to San Francisco. (AP Photo/NTSB)

A National Transportation Safety Board (NTSB) investigator looks at the tail section of the Asiana Airlines Flight 214 that crashed at San Francisco International Airport in San Francisco, California in this handout file photo released on July 7, 2013. Pilots of the Asiana Airlines Inc plane were aware the plane was traveling too slowly and tried to correct it in the final seconds before impact, according to documents released on December 11, 2013 by U.S. aviation safety investigators. (REUTERS/NTSB/Handout via Reuters)

REUTERS

Pilot mismanagement and confusion caused Asiana Flight 214 to crash in San Francisco last year, U.S. accident investigators concluded Tuesday.

The National Transportation Safety Board said there was confusion over whether one of the airliner's key controls was maintaining speed.

The agency also cited the complexity of the Boeing 777's autothrottle and pilot training by the South Korea-based airline as contributing to the crash, which killed three passengers and injured more than 200.

(AP)

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Asiana Airlines Flight 214 crash