Lion Air pilots struggled to maintain control of their Boeing jet as an automatic safety system in the Boeing jet repeatedly pushed the plane's nose down, according to a draft of a preliminary report by Indonesian officials who are looking into last month's deadly crash.

The investigators are focusing on whether faulty information from sensors led the plane's system to force the nose down.

Indonesian authorities are expected to issue a report Wednesday, although it is unclear whether they will offer a probable cause for the Oct. 29 crash. The new Boeing 737 MAX 8 plunged into the Java Sea, killing all 189 people on board.

Boeing did not immediately respond to an e-mailed request for comment.

Associated Press