Boeing 737 Max Boeing 737 Max. A preliminary report doesn't offer a cause for the accident but provides the most detailed look so far into the chaotic minutes before the crash and into the steps that were taken to address malfunctions that occurred on the plane the previous night. (Photo: Mike Kane/Bloomberg)

A malfunctioning sensor at the center of the investigation into the Oct. 29 crash of a Lion Air jetliner into the Java Sea wasn't repaired before the fatal flight even though it had failed on the plane's previous trip, according to a preliminary investigative report.

A mechanic worked on other sensors and equipment during a night shift before the early morning departure, but not on the so-called angle-of-attack vane, according to Indonesia's National Transportation Safety Committee. Portions of the committee's report were viewed by Bloomberg News before a scheduled release Wednesday.

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