US regulators scrutinize Boeing's 737 MAX after deadly Lion Air crash

Boeing is grappling with intensifying pressure from government regulators and airline pilots after Indonesian investigators cited a technical glitch in a Lion Air crash that killed 189 passengers aboard the latest version of the company’s most popular jetliner.

A sensor problem on the downed single-aisle 737 MAX caused an “erroneous input” to a device that tracks the plane’s ascent to prevent stalling, forcing the plane downward too quickly for the pilot to compensate, authorities in the southeast Asian country said. U.S. regulators, which required airlines this month to update operations manuals on the handling of such issues, are working with Boeing to determine whether any software or design changes are necessary.