Boeing Says Cockpit Alert System Wasn't Working on Every 737
- Manufacturer says sensor warning wasn’t working on all planes
- Disclosure adds new mystery about design of best-selling jet
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Boeing Co. acknowledged that a cockpit alert notifying pilots of a sensor malfunction linked to two fatal accidents wasn’t working as represented on every 737 Max.
The planemaker said it didn’t purposefully deactivate a warning meant to show if two angle-of-attack vanes provided conflicting data to aircraft flight computers. But the alert only functioned if operators purchased a separate optional indicator, Boeing said in a statement Monday.