May 5, 2019
When Boeing began delivering its 737 Max to customers in 2017, the company believed that a key cockpit warning light was a standard feature in all of the new jets.
But months after the planes were flying, company engineers realized that the warning light worked only on planes whose customers had bought a different, optional indicator.
In essence, that meant a safety feature that Boeing thought was standard was actually a premium add-on.
Boeing detailed its initial confusion about the warning light in a statement released on Sunday, adding new details to what was already known about the flawed design and introduction of the 737 Max, its best-selling jetliner.
The initial lack of knowledge about the feature’s functionality, along with the delayed disclosure, add to the concern about Boeing’s management of the Max’s design. The revelations add to Boeing’s mounting problems, which include frayed relations with airlines and customers, multiple federal investigations, growing financial costs and the remaining work to get the Max flying again.
The warning light notifies pilots of a disagreement in the sensors that measure which direction the plane is pointed, a potential sign of a malfunction. This light could have provided critical information to the pilots on two flights that crashed shortly after takeoff in recent months.
In both doomed flights — Lion Air Flight 610 and Ethiopian Airlines Flight 302 — preliminary investigations suggest that there were problems with these so-called angle of attack sensors early in the flights, activating new anti-stall software that sent the planes into unrecoverable nose-dives.
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