Lion Air JT610 Pilots Struggled Against Boeing’s 737 MAX Flight-Control System (Black-Box Data Shows)
Data from the fatal Oct. 29 flight that killed 189 people, and from the prior day's flight of the same jet, raises questions about three factors that seem to have contributed to the crash.
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November 27, 2018 - by Dominic Gates for Seattle Times
A key instrument was faulty as the plane taxied. As soon as airborne, the pilot's yoke started shaking
Then Boeing's 737 MAX anti-stall system relentlessly pushed the jet's nose down 26 times before the pilots lost control
The preliminary NTSC report states that the maintenance logs for the accident aircraft recorded problems related to airspeed and altitude on each of the four flights that occurred over the three days prior to Flight 610.
A key instrument reading on Lion Air flight JT610 was faulty even as the pilots taxied out for takeoff. As soon as the Boeing 737 MAX was airborne, the captain's control column began to shake as a stall warning.
And from the moment they retracted the wing flaps at about 3,000 feet, the two pilots struggled — in a 10-minute tug of war — against a new anti-stall flight-control system that relentlessly pushed the jet's nose down 26 times before they lost control.
Though the pilots responded to each nose-down movement by pulling the nose up again, mysteriously they didn't do what the pilots on the previous day's flight had done: simply switched off that flight-control system.
The detail is revealed in the data from the so-called "black box" flight recorder (it's actually orange in color) from the fatal Oct. 29 flight that killed 189 people and the prior day's flight of the same jet, presented last Thursday to the Indonesian Parliament by the country's National Transportation Safety Committee (NTSC).
This data is the major basis for the preliminary crash-investigation report that was made public Wednesday in Indonesia, Tuesday evening in Seattle.
The flight-recorder data is...
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