Boeing Co said on Sunday it had inadvertently made an alarm alerting pilots to a...
CHICAGO/WASHINGTON - Boeing Co said on Sunday it had inadvertently made an alarm alerting pilots to a mismatch of flight data optional on the 737 MAX, instead of standard as on earlier 737s, but reiterated that the missing display represented no safety risk.
Erroneous data from a sensor responsible for measuring the angle at which the wing slices through the air - known as the Angle of Attack - is suspected of triggering a flawed piece of software that pushed the plane downward in two recent crashes. “Neither the angle of attack indicator nor the AOA Disagree alert are necessary for the safe operation of the airplane,” Boeing said.
The Federal Aviation Administration backed that assessment but criticized Boeing for being slow to disclose the problem. Boeing has said the feeding of erroneous Angle of Attack data to a system called MCAS that pushed the planes lower was a common link in two wider chains of events leading to both crashes, but has stopped short of admitting error on that front.
Some analysts and academics say having the AOA Disagree alert installed would have helped Lion Air maintenance crew diagnose a problem on the penultimate flight of the 737 MAX jet that crashed in October, killing all 189 on board.
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