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Boeing Told Southwest After Lion Crash That Max Lacked Key Alert

  • Carrier thought warning light was operative on revamped 737
  • New questions raised as Boeing seeks to end plane’s grounding
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Boeing Told Southwest That Max Lacked Key Alert After Lion Crash

Southwest Airlines Co. first learned from Boeing Co. after a deadly Lion Air crash in October that an alert warning pilots of a sensor malfunction linked to the disaster wasn’t a standard feature on the 737 Max.

The world’s largest 737 operator and its pilots had thought that the warning worked on all Max jets, as it had on the previous generation of 737 aircraft, Southwest said Sunday. The airline only learned after the accident that on the Max, the feature was connected to a separate indicator display -- available for a fee -- that provides readings from the plane’s two angle-of-attack vanes.