FILE PHOTO: Wreckage recovered from Lion Air flight JT610, that crashed into the sea, lies at Tanjung Priok port in Jakarta, Indonesia, October 29, 2018. REUTERS/Willy Kurniawan/File Photo
SINGAPORE/SEATTLE (Reuters) - An optional warning light could have alerted engineers about mechanical faults on Lion Air's Boeing 737 MAX jet that crashed last month, experts said, sparking an industry debate over whether installing the system should become mandatory.
Lion Air did not install the AOA DISAGREE alert, which warns pilots when the "angle of attack" (AOA) readings do not match, because it is optional and not required by regulators, Managing Director Daniel Putut told Reuters.
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