Boeing said Sunday it knew of a safety alert flaw in the cockpit of its 737 MAX jetliners months before the first of 2 fatal crashes involving the now-grounded aircraft, but it didn’t immediately notify regulators.
The issue concerns a warning light in the cockpit, known as the AOA Disagree alert. This alert is meant to notify the flight crew that two angle-of-attack (AOA) sensors are providing data that disagree with each other, which suggests one is erroneous.
The company said in a statement the aircraft’s “display system software did not correctly meet” the AOA alert requirements in 2017 — well before October’s Lion Air crash in Indonesia, which killed 189 people.
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