An attempt to abort the landing ended with the Asiana Airlines Boeing 777 crashing at San Francisco's airport on Saturday, where officials said the plane was traveling "significantly below" its intended speed and the abort occurred just seconds before it hit the seawall in front of the runway.
Information collected from the plane's cockpit voice recorder and flight data recorder indicated that there were no signs of trouble during the landing until seven seconds before impact, when the crew tried to accelerate, U.S. National Transportation Safety Board Chairwoman Deborah Hersman said at a news conference at the airport, according to The Associated Press.
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At the time of the landing abort, a stall warning sounded four seconds before impact, and the crew tried to initiate what's known as a "go around" maneuver just 1.5 seconds before crashing, Hersman said.
"Air speed was significantly below the target airspeed," she said.
The crash from the landing abort killed two teenage Chinese students and injured more than 180 people, at least two dozen of them seriously, local officials said.
Hersman said it was too early to speculate on the cause of the crash. The data recorders corroborated witness accounts and an amateur video, obtained by CNN, that indicated the plane came in too low, lifted its nose in an attempt to gain altitude, and then bounced along the tarmac after the rear of the aircraft hit a seawall at the approach to the runway.
Asked whether the information reviewed by the NTSB showed pilot error in the crash after the aborted landing, Hersman did not answer directly.
"What I will tell you is that the NTSB conducts very thorough investigations. We will not reach a determination of probable cause in the first few days that we're on an accident scene," she told reporters.
Asiana said mechanical failure did not appear to be a factor in the crash. Hersman confirmed that a part of the airport's instrument-landing system was offline on Saturday but cautioned against drawing conclusions from that, noting that the so-called glide slope system was not essential to safe operations in good weather. She said it was a clear day with good visibility.
Asiana, South Korea's junior carrier, has had two other fatal crashes in its 25-year history.
A senior Asiana official said the pilot was Lee Jeong-min, a veteran pilot who has spent his career with the airline. He was among four pilots on the plane who rotated on two-person shifts during the 10-hour flight, the official said.
Six people remained in critical condition at San Francisco General Hospital on Sunday, including one girl, a hospital spokeswoman said, and 13 others were in less serious condition. Stanford Hospital said late on Saturday that three people were in critical condition and 10 in serious condition there.
At least five people were still being treated at other area hospitals on Sunday morning.
Some of the injured at San Francisco General suffered spinal fractures, including paralysis, and others sustained head trauma and abdominal injuries, according to Margaret Knudson, chief of surgery at the hospital.
At least two patients also suffered "severe road rash suggesting they were dragged," Knudson said. The injured patients who were able to talk said they were all sitting in the back of the plane, Knudson said.
The plane was coming in from Seoul when witnesses said its tail appeared to hit the approach area of a runway that juts into San Francisco Bay.
The impact knocked off the plane's tail and the aircraft appeared to bounce violently, scattering a trail of debris and spinning before coming to rest on the tarmac.
Benjamin Levy, a 39-year-old venture capitalist from San Francisco who sat in a window seat near one of the wings, said the flight crew gave "no indication whatsoever" that there was any problem with the landing moments before the aircraft struck the runway.
Following the initial collision, "we're going back up and I'm thinking maybe we're taking off again. We didn't and we went back pretty hard and bounced," he told reporters after being released from San Francisco General.
"It's like a Six Flags show," he said, referring to a theme park. "We were skipping on the runway."
Pictures taken by survivors showed passengers hurrying out of the wrecked plane, some on evacuation slides. Thick smoke billowed from the fuselage and TV footage later showed the aircraft gutted and blackened by fire. Much of its roof was gone.
Interior damage to the plane also was extreme, Hersman said on CNN.
"You can see the devastation from the outside of the aircraft, the burn-through, the damage to the external fuselage," she said. "But what you can't see is the damage internally. That is really striking."
The dead were identified as Ye Meng Yuan and Wang Lin Jia, both 16-year-old girls and described as Chinese nationals who are students, Asiana Airlines said. They had been seated at the rear of the aircraft, according to government officials in Seoul and Asiana, and were found outside the airplane.
The crash was the first fatal accident involving the Boeing 777, a popular long-range jet that has been in service since 1995. It was the first fatal commercial airline accident in the United States since a regional plane operated by Colgan Air crashed in New York in 2009.
"For now, we acknowledge that there were no problems caused by the 777-200 plane or (its) engines," Yoon Young-doo, the president and CEO of the airline, told reporters on Sunday at the company headquarters on the outskirts of Seoul.
Asiana on Sunday said the flight, which originated in Shanghai, had carried 291 passengers and 16 crew members. The passengers included 141 Chinese, 77 South Koreans, 64 U.S. citizens, three Indians, three Canadians, one French, one Vietnamese and one Japanese citizen.
Vedpal Singh, a native of India, was on board the flight along with his wife and son when the aircraft struck the landing strip.
"Your instincts take over. You don't know what's going on," said Singh, who had his arm in a sling as he walked through the airport's international terminal and told reporters he had suffered a fractured collar bone.
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