From article :-<p>"Boeing's troubled 737 MAX planes — which have twice crashed, killing 346 people — have experienced at least six mid-air emergencies and dozens of groundings in the year after an extensive probe cleared them to fly.<p>The incidents, pulled from US government air safety databases, are among more than 60 mid-flight problems reported by pilots in the 12 months after the US Federal Aviation Administration (FAA) recertified the plane's airworthiness in late 2020.<p>Former employees of both Boeing and the FAA characterised the reports — which included engine shutdowns and pilots losing partial control of the plane — as serious and with the potential to end in tragedy."