Boeing is making a more extensive software change to the flight-control system in the 737 MAX than industry officials initially anticipated

WSJ | 3/12/2019 | Andrew Tangel
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The change would mark a major shift from how Boeing originally designed a stall-prevention feature in the aircraft, which were first delivered to airlines in 2017.

U.S. aviation regulators are expected to mandate the change by the end of April.

Boeing - Details - MAX - Software - Update

Boeing publicly released details about the planned 737 MAX software update on its website late Monday. A company spokesman confirmed the update would use multiple sensors, or data feeds, in MAX’s stall-prevention system—instead of the current reliance on a single sensor.

The change was prompted by preliminary results from the Indonesian crash investigation indicating that erroneous data from a single sensor, which measures the angle of the plane’s nose, caused the stall-prevention system to misfire. Then, a series of events put the aircraft into a dangerous dive.

Focus - Update - Urgency - Aviation - Regulators

Focus on the update has taken on greater urgency as aviation regulators and airlines around the world have grounded their MAX fleets, following the Ethiopian crash over the weekend—despite no links being made between the two crashes by investigators.

The MAX software change is expected to take about an hour for each plane, a Boeing spokesman said Tuesday. He declined to offer other details about how the system would weigh the multiple data inputs.

Months - Aftermath - Lion - Air - Flight

“For the past several months and in the aftermath of Lion Air Flight 610, Boeing has been developing a flight control software enhancement for the 737 MAX, designed to make an already safe aircraft even safer,” Boeing said late Monday in a statement.

The FAA has decided to allow the 737 MAX to continue flying, a break with counterparts in countries including the U.K., Australia and Singapore, which grounded the model in recent days.

Investigation - Oct - Lion - Air - Crash

The investigation into the Oct. 29 Lion Air crash is continuing, but has focused on the stall-prevention system, apparent maintenance lapses and potential pilot error. Investigators have revealed little about the circumstances leading...
(Excerpt) Read more at: WSJ
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