At that point, the crew set the vertical speed mode on the visual approach at about 1,500ft per minute, she says. But that descent rate brought the 777 down too fast.
As they passed 500ft, Lee Jeong-min, who was making his debut flight as a 777 instructor, noticed the three glowing red lights on the airport's precision approach path indicator that signaled they were slightly too low, Hersman says the captain told the NTSB.
"They had set speed at 137kt (254km/h) and he assumed the autothrottles were maintaining speed," Hersman says, based on the interview with Lee Jeong-min.
"Armed means that they are available to be engaged, but depending on what mode is used we really need to understand that a little better," Hersman says.
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