Pilot error upon descent and an over-reliance on automated systems.
That was the cause of last July's passenger plane crash at San Francisco International Airport, according to the U.S. National Transportation Safety Board.
Investigators say Asiana Airlines Flight 2-1-4 came in too low and too slow in its landing approach, which caused the plane to slam into a seawall, ripping off the tail and sending the fuselage skidding down the runway.
Three people died and another 200 were injured in the crash.
The NTSB added that the trainee pilot of the Asiana flight lacked sufficient training and inadvertently shut off an automatic speed control system that MIGHT have prevented the accident.
A portion of the blame was also placed on Boeing for the complexities of the autothrottle on the 7-7-7 jet.
"A lot of issues lined up the wrong way as it turned out, to produce this result because each one of those issues probably happens a lot by itself innocuously and in fact if you removed any one of those links in the chain, this accident wouldn't have happened."
Asiana Airlines, in a statement, said they accept the NTSB's conclusion and that they have been bolstering safety measures since last summer's crash.
But the Korean-based airliner also pointed the finger at Boeing, citing "inconsistencies" with the autothrottle system, which they say led pilots to believe they could maintain the plane's speed.
Boeing is adamant the airplane performed as expected and that it did "not contribute to the accident", saying the 7-7-7 has an extraordinary safety record and it is the PILOTS who were at fault.
Shin Se-min, Arirang News.