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Asiana Flight 214 was well below normal landing speed when it struck the runway.
Parents of Wang Linjia (center) are comforted by parents of some other students who were on the Asiana Airlines Flight 214 when it crashed at San Francisco International Airport, while they gather and wait for news of their children at Jiangshan Middle School in Jiangshan city, in eastern China's Zhejiang province Sunday. Chinese state media have identified the two people who died in the plane crash at San Francisco International Airport on Saturday as Ye Mengyuan and Wang Linjia, 16-year-old students at Jiangshan Middle School in China's eastern Zhejiang province.
This frame grab from video provided by KTVU shows the scene after an Asiana Airlines flight crashed while landing at San Francisco Airport on Saturday.
A fire truck sprays water on Asiana Flight 214 after it crashed at San Francisco International Airport on Saturday in San Francisco.
AP Photo/Antonette Edwards
A federal aviation official said this photo shows an Asiana Airlines flight crashing while landing at San Francisco airport on Saturday.
This photo provided by Wei Yeh shows what a federal aviation official says was an Asiana Airlines flight crashing while landing at San Francisco airport on Saturday, July 6, 2013. (AP Photo/Wei Yeh)
Smokes rises from Asiana Flight 214 after it crashed at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Bay Area News Group, John Green)
Smokes rises from Asiana Flight 214 after it crashed at San Francisco International Airport on Saturday.
The wreckage of Asiana Flight 214 after it crashed at San Francisco International Airport on Saturday.
The tail of Asiana Flight 214 (right) after it crashed at San Francisco International Airport on Saturday.
Fire crews work the crash site of Asiana Flight 214 at San Francisco International Airport on Saturday.
The scene after an Asiana Airlines flight crashed while landing at San Francisco Airport on Saturday.
Fire crews respond to the scene where Asiana Flight 214 crashed at San Francisco International Airport on Saturday.
Monday, July 8, 2013
SAN FRANCISCO — Pilots of Asiana Flight 214 were flying too slowly as they approached San Francisco airport, triggering a control board warning that the jetliner could stall, and then tried to abort the landing seconds before crashing, according to federal safety officials.
Investigators also said they were looking into the possibility that rescue crews ran over one of the two teenagers killed in the crash on Saturday.
The Boeing 777 was traveling at speeds well below the target landing speed of 137 knots, or 157 mph, said National Transportation Safety Board chief Deborah Hersman at a briefing Sunday on the crash.
Hersman said the aircraft’s stick shaker — a piece of safety equipment that warns pilots of an impending stall — went off moments before the crash. The normal response to a stall warning is to increase speed to recover control.
There was an increase several seconds before the crash, she said, basing her comments on an evaluation of the cockpit voice and flight data recorders that contain hundreds of different types of information on what happened to the plane.
And at 1.5 seconds before impact, there was a call for an aborted landing, she said.
The new details helped shed light on the final moments of the airliner as the crew tried desperately to climb back into the sky, and confirmed what survivors and other witnesses said they saw: a slow-moving airliner.
Pilots normally try to land at the target speed, in this case 137 knots, plus an additional five more knots, said Bob Coffman, an American Airlines captain who has flown 777s. He said the briefing raises an important question: “Why was the plane going so slow?”
The plane’s Pratt & Whitney engines were on idle, Hersman said. The normal procedure in the Boeing 777, a wide-body jet, would be to use the autopilot and the throttle to provide power to the engine all the way through to landing, Coffman said.
There was no indication in the discussions between the pilots and the air traffic controllers that there were problems with the aircraft.
Among the questions investigators are trying to answer was what, if any, role the deactivation of a ground-based landing guidance system played in the crash. Such systems help pilots land, especially at airports such as San Francisco where fog can make landing challenging.
Altogether, 305 of the 307 people aboard made it out alive after a scene that survivors and rescuers described as nothing less than astonishing: a fire burning inside the fuselage, pieces of the aircraft scattered across the runway and people fleeing for their lives.
The flight originated in Shanghai, China, stopped over in Seoul, South Korea, then made the nearly 11-hour trip to San Francisco. The South Korea-based airline said four South Korean pilots were on board, three of whom were described as “skilled.”
As the plane approached the runway under clear skies — a luxury at an airport and city known for intense fog — people in nearby communities could see the aircraft was flying low and swaying erratically from side to side.
When the plane hit the ground, oxygen masks dropped down, said Xu Da, a product manager at an Internet company in Hangzhou, China, who was sitting with his wife and teenage son near the back of the plane.
When he stood up, he said he could see sparking — perhaps from exposed electrical wires.
He turned and could see the tail where the galley was torn away, leaving a gaping hole through which they could see the runway. Once on the tarmac, they watched the plane catch fire and firefighters hose it down.
“I just feel lucky,” said Xu, whose family suffered some cuts and have neck and back pain.
By the time the flames were out, much of the top of the fuselage had burned away. The tail section was gone, with pieces of it scattered across the beginning of the runway. One engine was gone, and the other was no longer on the wing.
San Mateo County Coroner Robert Foucrault said senior San Francisco Fire Department officials notified him and his staff at the crash site on Saturday that one of the 16-year-olds may have been struck on the runaway.
Foucrault said an autopsy he expects to be completed by today will involve determining whether the girl’s death was caused by injuries suffered in the crash or “a secondary incident.”
Weather JournalEarly mix, then ice storm Sunday