Lion air logo on jet tail. The initial readings from the data recorder showing an airspeed malfunction offer the first solid explanation for why the flight appeared to vary its speeds and altitude starting shortly after takeoff. (Photo: David Ryder/Bloomberg)

The Lion Air plane that crashed in the Java Sea last week had faulty airspeed readings during its last four flights and Indonesian investigators called on planemaker Boeing Co. and U.S. authorities to ensure there aren't fleet-wide issues.

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