Doomed Jets Lacked 2 Safety Features That Boeing Sold as Extras

Now, in the wake of the two deadly crashes involving the same jet model, Boeing will make one of those safety features standard as part of a fix to get the planes in the air again. Faulty data from sensors on the Lion Air plane may have caused the system, known as MCAS, to malfunction, authorities investigating that crash suspect. That software system takes readings from two vanelike devices called angle of attack sensors that determine how much the plane’s nose is pointing up or down relative to oncoming air.

Source: www.nytimes.com