Boeing says software fix to always allow override of anti-stall system

SEATTLE (Reuters) - Boeing Co said on Thursday that a new software fix for its anti-stall system, at the centre of investigations into two deadly plane crashes, will give pilots the authority to always override the system if activated by faulty sensor data.

The world's largest planemaker, facing its worst crisis in years and the worldwide grounding of its top-selling jetliner, said its software upgrade and associated pilot training will add additional layers of protection to prevent erroneous data from triggering its so-called MCAS system.