• More concerns over Boeing instruments.

Aircraft problems may have played a role in the fatal crash of a brand-new Boeing 737 Max 8 in Indonesia last week, investigators said.

An Indonesian official suggested that inaccurate readings could have prompted the Lion Air plane to enter a sudden, automatic descent. That added a new element to what investigators have been scrutinizing, including faulty airspeed indicators and possibly flawed maintenance.

Boeing has issued a worldwide bulletin on how to respond to errant data to all operators of the plane, one of the most popular in commercial aviation.

The developments suggested that multiple factors may have combined to cause the crash, which killed all 189 people aboard. Above, investigators examining engine parts.